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Factors Associated With Physical Therapists' Implementation of Physical Activity Interventions in the Netherlands

Johanna M. Huijg, Elise Dusseldorp, Winifred A. Gebhardt, Marieke W. Verheijden, Nicolette van der Zouwe, Barend J.C. Middelkoop, Geerke Duijzer, Mathilde R. Crone
DOI: 10.2522/ptj.20130457 Published 1 April 2015
Johanna M. Huijg
J.M. Huijg, MSc, Health, Medical and Neuropsychology, Leiden University, Leiden, the Netherlands.
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Elise Dusseldorp
E. Dusseldorp, PhD, Netherlands Organization for Applied Scientific Research (TNO), Leiden, the Netherlands.
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Winifred A. Gebhardt
W.A. Gebhardt, PhD, Health, Medical and Neuropsychology, Leiden University, Leiden, the Netherlands.
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Marieke W. Verheijden
M.W. Verheijden, PhD, Netherlands Organization for Applied Scientific Research (TNO).
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Nicolette van der Zouwe
N. van der Zouwe, PhD, Regional Public Health Service, Hollands Midden, the Netherlands.
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Barend J.C. Middelkoop
B.J.C. Middelkoop, MD, PhD, Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands.
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Geerke Duijzer
G. Duijzer, MSc, Division of Human Nutrition, Wageningen University, Academic Collaborative Centre AGORA, Wageningen, the Netherlands.
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Mathilde R. Crone
M.R. Crone, PhD, Department of Public Health and Primary Care, Leiden University Medical Center.
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Abstract

Background Physical therapists play an important role in the promotion of physical activity (PA) and the effectiveness of PA interventions. However, little is known about the extent to which they implement PA interventions following the intervention protocol and about the factors influencing their implementation behaviors.

Objective The study objective was to investigate physical therapists' implementation fidelity regarding PA interventions, including completeness and quality of delivery, and influencing factors with a Theoretical Domains Framework–based questionnaire.

Design The study was based on a cross-sectional design.

Methods A total of 268 physical therapists completed the Determinants of Implementation Behavior Questionnaire. Questions about completeness and quality of delivery were based on components and tasks of PA interventions as described by the Royal Dutch Society for Physical Therapy. Multilevel regression analyses were used to identify factors associated with completeness and quality of delivery.

Results High implementation fidelity was found for the physical therapists, with higher scores for completeness of delivery than for quality of delivery. Physical therapists' knowledge, skills, beliefs about capabilities and consequences, positive emotions, behavioral regulation, and the automaticity of PA intervention delivery were the most important predictors of implementation fidelity. Together, the Theoretical Domains Framework accounted for 23% of the variance in both total completeness and total quality scores.

Limitations The cross-sectional design precluded the determination of causal relationships. Also, the use of a self-report measure to assess implementation fidelity could have led to socially desirable responses, possibly resulting in more favorable ratings for completeness and quality.

Conclusions This study enhances the understanding of how physical therapists implement PA interventions and which factors influence their behaviors. Knowledge about these factors may assist in the development of strategies to improve physical therapists' implementation behaviors.

Although physical activity (PA) plays an important role in disease prevention, health promotion, and quality of life,1–3 many people are not sufficiently active.4 In the Netherlands, 40% of adults aged 18 to 65 years fail to achieve the national recommendation of at least 30 minutes of moderately intense PA on at least 5 days a week.5–7 Moreover, about 50% of adults with a chronic disease do not meet this norm.7 Primary health care (PHC) is an ideal setting in which to promote PA in the general population.8,9 Most adults visit a PHC professional at least once per year,8 and these professionals perceive PA promotion as an important part of their role.10 Furthermore, PHC-based PA interventions (eg, counseling about PA, prescribing PA, referral to a PA training program) are successful in increasing PA, at least in the short term.11–14

However, the public health impact of efficacious PHC-based PA interventions is strongly dependent on how they are implemented in practice.15–17 Implementation fidelity refers to the extent to which an intervention is delivered as intended (also known as adherence, compliance, or integrity),16,18 including both quantity or completeness of delivery (ie, how many of the intervention components are delivered)16,18–20 and quality of delivery (ie, how well the intervention components are delivered).16,18,20,21 Although the efficacy of PHC-based PA interventions has been well studied, less attention has been paid to PHC professionals' implementation of evidence-based interventions in practice.21,22 Investigating PHC professionals' implementation behaviors is important because the extent to which interventions are delivered as intended can moderate the relationship between interventions and their intended outcomes.16 Therefore, implementation research is likely to enhance the accurate interpretation of intervention outcomes,16,18 for example, by providing information on why interventions are (or are not) effective.23

Because of their training and experience, physical therapists are PHC professionals who play an important role in PA promotion and, through implementation fidelity, have a strong potential to increase the effectiveness of PA interventions.9,24,25 Moreover, they are an important group of health care professionals delivering PA interventions in Dutch PHC.26 During the past 2 decades, evidence-based practice has become important in physical therapy.27,28 In the Netherlands, the Royal Dutch Society for Physical Therapy (KNGF) has developed evidence-based protocols for the delivery of PA interventions to people with a variety of conditions, such as chronic obstructive pulmonary disease (COPD), diabetes, arthritis, and obesity.29 These PA intervention protocols provide general information on PA and background information on the specific condition a protocol addresses and describe how physical therapists can promote PA in an evidence-based way. Furthermore, the protocols summarize the core components of PA interventions (intake, training program, evaluation, attention to maintenance of PA, and contact with the referring professional) and their underlying tasks (eg, determine goals and set up a training program with the right content and intensity). The KNGF recommends the use of these general evidence-based PA intervention protocols to guide the development of local PA intervention protocols. Furthermore, in the past decade, many Dutch physical therapists have been trained to deliver KNGF-based PA interventions to their patients.26

Despite the promising findings related to the efficacy of PHC-based PA interventions,11–14 PA interventions are frequently not delivered as intended by the intervention developers.30,31 Furthermore, research has indicated that physical therapists' evidence-based practices can be improved.25,28,32,33 These situations may be due (in part) to the complexity of behaviors involved in providing patient care and delivering behavior change interventions (eg, PA interventions) as well as the many different potential determinants of such behaviors, including factors related to innovation, social setting, organizational context, innovation strategy, patient, and intervention provider.15,34–36 Indeed, qualitative studies have indicated that similar factors are important for PHC professionals' implementation of PA interventions37 and physical therapists' evidence-based practices.38 However, only limited data on physical therapists' implementation of PA interventions and factors that influence their behaviors are available. Such knowledge is a prerequisite for the development of effective strategies to enhance physical therapists' implementation behaviors.15,23,39–42

Given the range of potential factors associated with health care professionals' implementation behaviors, many researchers have advocated the use of theory to guide the selection of factors to investigate.23,41,43–45 First, behavior change interventions that are based on theory are likely to be more effective than those that are not41,46–48; the same also may be true for interventions aimed at changing health care professionals' implementation behaviors, that is, implementation strategies. Second, through assessment of the importance of theory-based factors, theoretical constructs that affect patterns of care and, therefore, may be targeted by implementation strategies can be identified.23,40,41 However, the heterogeneity of theories and frameworks that guide implementation research has led to challenges in measuring theory-based factors underlying health care professionals' behaviors.44,45,48,49

The Theoretical Domains Framework50,51 (TDF) can be used to develop a measurement instrument able to assess determinants of health care professionals' implementation of behavior change interventions.52,53 In the original TDF,51 constructs from 33 behavior change theories were grouped into 12 domains of behavioral determinants covering the full range of current scientific explanations for human behavior. The TDF can be used to identify suitable theories for further investigation of specific implementation behaviors.54 Furthermore, the TDF links influencing factors to behavior change techniques that can be used in implementation strategies.40,50 Huijg et al55 developed a TDF-based questionnaire to assess potential behavioral determinants in a theory-based way. In the initial investigation of its psychometric properties, the Determinants of Implementation Behavior Questionnaire was suggested to have acceptable construct validity (based on confirmatory factor analysis), and most of the TDF domains appeared to be reliably and discriminately measurable.55

The aim of the present study was to investigate the extent to which physical therapists deliver PA interventions with high fidelity (ie, following the intervention protocol) and which TDF domains51 are associated with completeness and quality of delivery. The 3 specific questions were: (1) To what extent do physical therapists deliver all PA intervention components to all of their patients (ie, completeness)? (2) How well do they deliver PA interventions (ie, quality)? and (3) Which TDF domains are associated with physical therapists' completeness and quality of delivery?

Method

Design and Respondents

This cross-sectional questionnaire study was conducted via the Internet with Qualtrics software (version 45433, Qualtrics, Provo, Utah).56 Recruitment and data collection took place between June 2012 and March 2013. We recruited physical therapists delivering PA interventions to a variety of target groups to examine the association between the TDF domains and the implementation of PA interventions in general. The PA interventions under study were based on evidence-based PA intervention protocols recommended by the KNGF for COPD, diabetes, arthritis, and obesity29 and were similar with regard to their core components (intake, training program, evaluation, attention to maintenance of PA, and contact with the referring professional).

The first strategy for recruiting physical therapists was to contact their professional associations and collaborations within the Netherlands. These associations and collaborations invest time and effort in the implementation of PA interventions by, for example, developing local PA intervention protocols, providing training, and organizing meetings. When associations and collaborations were willing to participate in the study, a questionnaire on the implementation of the specific PA intervention on which they chose to be evaluated was developed. Subsequently, member physical therapists were sent an e-mail including a link to the online questionnaire and were assured that their responses would be confidential and anonymous. Physical therapists were eligible for participation if they had experience with and were currently delivering one of the PA interventions under study and if they were working in PHC. Because completing the questionnaire indicated consent, no separate consent was obtained. Individual physical therapists were rewarded with a €25 voucher for their participation. Associations and collaborations were provided with a summary of the results.

The second recruitment strategy was to identify physical therapists delivering PA interventions via the Internet and practice websites. The physical therapists were contacted by telephone or e-mail and invited to join the study. Therapists who were willing to participate were sent an e-mail including a link to the online questionnaire. After 1, 2, and 3 weeks, nonrespondents received a reminder; at the end of the study, nonrespondents were sent an e-mail with a questionnaire about their demographic characteristics and their reasons for not participating in the study.

Measurement

Demographic characteristics.

Respondents and nonrespondents reported their sex, age, practice/workplace, and the socioeconomic status of most of the patients to whom they deliver interventions. Practice experience was reported in years. Experience with PA interventions was measured in a slightly different manner for the first group of recruited respondents than for nonrespondents or respondents recruited later on. Initially, the physical therapists were asked to how many patients in total they had delivered the intervention; later on, they were asked how many patients they had delivered the intervention to in the last 2 years. This change in questioning was based on respondents stating that it was difficult to report the total number of patients to whom they had delivered the intervention. Therefore, median scores were calculated for experience with PA interventions. Scores below the median indicated a shorter period of experience, and median scores and scores above the median indicated a longer period of experience.

Implementation fidelity.

Physical therapists' implementation fidelity for PA interventions, including completeness and quality of delivery, was assessed with a self-report questionnaire. The content of the questionnaire was based on the core components of PA intervention protocols recommended by the KNGF for COPD, diabetes, arthritis, and obesity (intake, training program, evaluation, attention to maintenance of PA, and contact with the referring professional) and their underlying tasks (Appendix 1).

Completeness of delivery was assessed by asking physical therapists with how many patients receiving interventions they had performed a certain task. The completeness of delivery of different intervention components was assessed with multiple items. On average, intake completeness was measured with 12 items, training program completeness was measured with 9 items, evaluation completeness was measured with 5 items, and attention to maintenance of PA completeness and contact with the referring professional completeness were measured with 2 items each. A sample question was, “With how many of the patients did you determine PA intervention goals?” Responses were assessed on a 7-point Likert scale (1=none, 2=a few, 3=less than half, 4=half, 5=more than half, 6=almost all, and 7=all). For each respondent, we calculated a total completeness score on the basis of the mean scores for all completeness items as well as a mean completeness score for each intervention component.

Specific PA intervention protocols were used to tailor completeness items to PA interventions concerning COPD, diabetes, arthritis, and obesity. This approach resulted in questionnaires that were similar for all physical therapists with regard to the intervention components and tasks but that were slightly different for various PA interventions with regard to the assessment of completeness at the item level. For instance, questionnaires assessing intake completeness in the delivery of PA interventions to people with COPD included a score for the assessment of patients' breathlessness, but this score was not included in the diabetes, arthritis, and obesity questionnaires. Furthermore, physical therapists' measurement of waist circumference was included in questionnaires on diabetes and obesity PA interventions, but this task was not included in the other questionnaires.

Quality of delivery was assessed by asking physical therapists' about their satisfaction with the delivery of a specific intervention component (intake, training program, evaluation, attention to maintenance of PA, and contact with the referring professional). Thus, quality was assessed with 5 items in total. A sample question was, “How satisfied are you with how you did the intake?” Responses were assessed on a 7-point Likert scale (1=not satisfied at all, 2=a little dissatisfied, 3=not satisfied/not dissatisfied, 4=a little satisfied, 5=satisfied, 6=very satisfied, and 7=totally satisfied). For each respondent, we calculated a total score for quality of delivery on the basis of the mean scores for all quality items.

TDF domains.

The Determinants of Implementation Behavior Questionnaire55 (Appendix 2) was used to assess which TDF domains were associated with physical therapists' completeness and quality of delivery of PA interventions. This part of the questionnaire was similar for all participants because physical therapists' implementation behaviors were referred to as “delivery of [PA intervention] following the intervention protocol.” This approach allowed us to assess one general behavior in relation to each domain instead of all of the different tasks involved in delivering PA interventions. To remind respondents about what this general behavior included for them, we presented them with the tasks that they would be required to perform if they were to deliver the specific PA intervention that they were using following the intervention protocol. A sample question was, “I am confident that I can deliver [PA intervention] following the intervention protocol.” Responses were assessed on a 7-point Likert scale (1=strongly disagree and 7=strongly agree). Mean scores were calculated for each of the 18 domains assessed in the questionnaire. For the domains organization and social influences, it was possible to use “not applicable” for some items; these scores were recorded as missing. To calculate the mean of the specific domains, we imputed data for items with missing values for each respondent separately by using the respondents' mean for the remaining items.

The questionnaire was pilot tested with 5 research colleagues and a sample of physical therapists (n=8). Pilot testing indicated that the questionnaire was understood and received well by the respondents. Questions on the implementation of specific PA interventions were discussed with physical therapists who had experience with their delivery.

Data Analysis

The target sample size was based on the recommendation of Stevens57 for a minimum of 270 respondents in a multiple regression analysis with 18 predictors.

Questionnaires were exported from Qualtrics56 to IBM SPSS Statistics for Windows (version 19.0, IBM Corp, Armonk, New York)58 for analyses. Differences in demographic characteristics between respondents and nonrespondents were analyzed with chi-square tests for categorical variables and independent t tests for continuous variables. Associations between domains were assessed with the Pearson correlation and were defined as small (.10), medium (.30), and large (.50), in accordance with the guidelines of Cohen.59 Intraclass correlations were calculated to assess the proportion of the total variability in the outcome that was attributable to the different PA interventions.

To answer the third research question (associations between the 18 TDF domains and the outcome variables self-reported completeness of delivery and quality of delivery), we performed multilevel regression analyses60 for each outcome variable separately. These multilevel analyses took into account the nonindependence of physical therapist scores (level 1) nested within the different PA interventions that they delivered (level 2). Two types of multilevel analyses were performed: a series of analyses including each domain separately as a predictor variable to assess (per domain) its univariate association with the outcome variable and an analysis including all domains together as predictor variables to identify the domains having the strongest unique association with the outcome variable (ie, adjusted for the influence of the other domains). Domains with strong univariate associations provide possible clues for targets of implementation strategies. Domains with the strongest unique association can be regarded as the most influential ones.

In the univariate multilevel analyses, the false discovery rate controlling procedure61 was used to correct for multiple testing. In the multivariate multilevel analyses, we computed the proportion of variance explained (R2) at the first level, that is, the physical therapist level. The R2 can be regarded as a measure of the total goodness of fit of the solution (ie, ranging from 0 to 1). The R2 was calculated as the decrease in residual variance from the intercept-only model to the model of interest (see formula 4.8 in Hox,60(p71) based on Raudenbush and Bryk62).

Role of the Funding Source

This research was funded by ZonMw, the Netherlands Organisation of Health Research and Development.

Results

Characteristics of the Respondents

Of the 496 physical therapists invited for the study, 274 (55.2%) delivering 15 different PA interventions completed the questionnaire. Of the 274 questionnaires, 268 were used in the analyses. Reasons for removal were no experience with PA intervention delivery (n=4) and nonreliable completeness and quality scores (n=2). Table 1 shows the characteristics of the respondents and nonrespondents. Of the respondents, 58.2% (n=156) were women, their average age was 39.8 (SD=12.3) years, and they had an average of 15.0 (SD=11.3) years of practice experience. Most of the respondents worked in a group practice (68.3%, n=183), and most delivered PA interventions to equal percentages of patients with low and high socioeconomic status (52.6%, n=141) or, specifically, to patients with low socioeconomic status (45.1%, n=121). None of the demographic variables showed a significant correlation with total completeness and quality scores (data not shown).

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Table 1.

Demographic Characteristics of Respondents and Nonrespondentsa

Of the 222 nonrespondents, 68 (30.6%) completed the nonrespondent questionnaire. Comparisons between respondents and nonrespondents indicated that the latter were significantly older and had more practice experience. The main reasons for not filling out the questionnaire were lack of experience with the specific PA intervention addressed by the questionnaire (n=26), lack of experience delivering the PA intervention due to a lack of patients receiving the PA intervention (n=33), and lack of time to fill out the questionnaire (n=16).

Implementation Fidelity

Physical therapists' completeness and quality scores are shown in Table 2. Mean completeness scores ranged from 5.6 (SD=1.4; for contact with the referring professional) to 6.2 (SD=0.7; for intake), indicating that (on average) the respondents delivered PA interventions following the intervention protocol to more than half and almost all of the patients receiving interventions. Mean quality scores were lower but were still relatively high, ranging from 4.9 (SD=1.2; for attention to maintenance of PA) to 5.5 (SD=0.9; for intake). These data indicated that (on average) the respondents were satisfied with how they delivered PA interventions. Correlations between completeness and quality scores ranged from .36 to .68, indicating that these were indeed different outcome measures (data not shown).

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Table 2.

Completeness and Quality Scores and Intraclass Correlation Coefficients (ICCs) (n=268)a

Role of Different PA Interventions in the Data

Intraclass correlation coefficients (ICCs) are shown in Table 2. The ICCs for completeness were higher than the ICCs for quality, indicating that the influence of the different PA interventions was larger for how respondents reported the completeness of delivery than for how they reported the quality of delivery. The ICCs for intake, training program, and evaluation completeness were higher than .10, supporting the appropriateness of multilevel analyses.63

Domains

Table 3 shows descriptive variables and correlations for all domains. The mean scores indicated that the physical therapists had generally favorable perceptions toward delivering PA interventions following the intervention protocol. The highest mean scores were found for the domains knowledge (X̅=5.95, SD=0.84), organization (X̅=5.82, SD=1.06), and skills (X̅=5.80, SD=1.01). These data indicated that the respondents were positive about their knowledge and skills for delivering PA interventions following the intervention protocol and that the organizations at which they worked provided them with sufficient resources and support to deliver PA interventions following the intervention protocol. The lowest mean scores were found for the domains negative emotions (X̅=1.68, SD=0.79), sociopolitical context (X̅=3.05, SD=1.22), and innovation strategy (X̅=4.16, SD=0.96). These data indicated that the respondents experienced few negative emotions while delivering the PA intervention; that they thought the medical culture and the availability of support in the sociopolitical context could be improved; and that they thought innovation strategies, such as training, material, and reimbursement, could be improved. Correlations between domains were mostly small or medium; 11 correlations were large.

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Table 3.

Correlations and Descriptive Statistics for All Domains (n=268)

Domains and Implementation Fidelity

With regard to total completeness and total quality, univariate multilevel analyses revealed multiple significant predictors (Tab. 4). On the basis of ranked P values, the most important predictors of both total completeness and total quality were beliefs about capabilities, behavioral regulation, nature of the behaviors, and knowledge. Furthermore, beliefs about consequences was one of the most important predictors of total completeness, and positive emotions was one of the most important predictors of total quality. The multivariate analysis resulted in only one significant predictor of both total completeness and total quality—beliefs about capabilities. Together, the TDF domains accounted for 23% (P<.001) of the variance in both total completeness of delivery and total quality of delivery.

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Table 4.

Domains and Total Completeness and Quality of Delivery (n=268)a

The most important predictors of physical therapists' total completeness and quality scores were confirmed by univariate multilevel analyses of the completeness and quality of delivery of the different intervention components (Tabs. 5 and 6). Knowledge, skills, beliefs about capabilities, and behavioral regulation were significantly associated with the completeness of delivery and the quality of delivery of all intervention components. In addition to these domains, nature of the behaviors, beliefs about consequences, and positive emotions were significantly associated with the quality of delivery but not with the completeness of delivery of all intervention components.

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Table 5.

Domains and Completeness of Delivery of Intervention Components (Univariate Analyses) (n=268)a

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Table 6.

Domains and Quality of Delivery of Intervention Components (Univariate Analyses) (n=268)a

Domains unrelated to implementation fidelity outcomes were innovation strategy (ie, unrelated to total completeness and quality of delivery) and optimism, sociopolitical context, and negative emotions (ie, unrelated to total completeness) (Tab. 4). Furthermore, the domains innovation strategy and sociopolitical context were unrelated to the completeness of delivery of any of the intervention components (Tab. 5).

Discussion

Because of the increasing importance of physical therapists' evidence-based practices, we investigated physical therapists' completeness and quality of delivery of PA interventions. To our knowledge, this is the first study investigating physical therapists' implementation of PA interventions in general as well as factors associated with their implementation behaviors.

The data from the respondents indicated that they delivered PA interventions with high fidelity. The completeness and quality scores indicated that they delivered PA interventions following the intervention protocol to more than half and almost all of their patients and that they were satisfied with the quality that they provided. The completeness scores appeared to be very good, particularly given that tailoring PA interventions to individual patients' needs may, at times, require deviation from the protocol.33 The high completeness scores may be explained by the use of a self-report questionnaire to assess implementation fidelity (discussed further below). Given the range of satisfaction scores (1=not satisfied at all, 2=a little dissatisfied, 3=not satisfied/not dissatisfied, 4=a little satisfied, 5=satisfied, 6=very satisfied, and 7=totally satisfied), our results suggested that physical therapists' quality of delivery of PA interventions could be improved. The findings seem to be in line with previous research on physical therapists' evidence-based practices, which suggests that the majority of patients receives evidence-based care but that there is still room for improvement.25,28,32,33

The results of the univariate multilevel analyses indicated that the most important domains associated with implementation fidelity were physical therapists' knowledge; skills; beliefs about capabilities to deliver PA interventions following the intervention protocol; beliefs about consequences of delivering PA interventions following the intervention protocol; positive emotions toward working with PA interventions; plans with regard to intervention delivery, including what to do when barriers, such as lack of time or lack of patient motivation, are encountered; and the extent to which delivering PA interventions following the intervention protocol is an automatic behavior. The importance of these domains was previously reported in qualitative studies of health care professionals' behaviors.38,48,64–66 Furthermore, constructs related to the domains knowledge,25 beliefs about capabilities (self-efficacy42,67 and perceived behavioral control42,67,68), beliefs about consequences (outcome expectations42,67 and attitudes28,67,68), behavioral regulation (action planning42,67 and coping planning42), and nature of the behaviors (automaticity or habit42,67,68) were found to predict health care professionals' behaviors in multiple quantitative studies. The findings suggest suitable theories for further investigation of physical therapists' implementation of PA interventions, such as the Social Cognitive Theory,69 the Theory of Planned Behavior,70 and the Self-regulation Theory.71 Furthermore, they provide possible clues for targets of implementation strategies. For linking associated domains to techniques of behavior change,40,50 strategies for enhancing physical therapists' implementation fidelity may include discussion and elaboration of guidelines to enhance knowledge and beliefs about consequences,72 modeling and self-monitoring to enhance beliefs about capabilities and skills,72 forming implementation intentions to enhance planning,72 and self-monitoring and positive feedback to increase the automaticity of implementing PA interventions following the intervention protocol.73 These goals could be achieved through well-designed implementation strategies, such as the provision of workshops and conferences, and systems to register behaviors related to guidelines.

On the basis of the results of the multivariate multilevel analyses, beliefs about capabilities appeared to be the most influential domain, with the strongest unique association with implementation fidelity. Together, the domains accounted for 23% of the variance in both total completeness of delivery and total quality of delivery. Although Huijg et al55 demonstrated discriminant validity of the domains of the Determinants of Implementation Behavior Questionnaire, the lower percentage of explained variance in the present study may be attributable to the large correlations between some of the domains, implying that they were not independent. In addition, the fact that only one significant predictor was found in the multivariate analysis, whereas in the univariate analyses many domains were significantly associated with the outcome variable, indicates that domains explain more or less the same portion of variations in implementation behaviors.

This finding may be explained by the fact that the TDF does not specify relationships between domains, which exist between the theoretical constructs that are integrated in the TDF. Therefore, the multivariate approach of exploring associations between domains and implementation behaviors lacks the theoretical strength of the individual theories that inform the TDF. The results suggest that the TDF is a good framework for use in implementation science in the sense that domains that relate to implementation behaviors are included, but they suggest that more effort is needed in formulating the paths through which domains influence behaviors. Moreover, the TDF may be used in a different approach, such as operationalizing different theories and comparing their predictive validities or operationalizing a specific theory (eg, the Theory of Planned Behavior70) and investigating the integration of other theoretical domains (eg, environmental context and resources) to enhance the prediction of health care professionals' behaviors.

Domains that were unrelated to implementation completeness were physical therapists' optimism, their negative emotions, and characteristics of the sociopolitical context and innovation strategy. The lack of effect of optimism and negative emotions may have been related to physical therapists' feedback on these specific questionnaire items, indicating that emotions do not play a role in how they do their work; however, the domain positive emotions was significantly related to the outcome variables. Notably, domains unrelated to implementation fidelity mainly concerned the context, whereas the most important domains associated with implementation fidelity were related to the individual physical therapist. A possible explanation for the lack of effect of the context domains is that we included physical therapists who were already delivering PA interventions to their patients, as we were interested in physical therapists' implementation behaviors. Therefore, the contextual barriers usually encountered before delivery takes place (ie, in the adoption stage), such as lack of financial support from insurance companies and a consequent lack of PA intervention patients, did not play a role. Our results correspond to previous research reporting that contextual factors are more related to the adoption of innovations and less related to their implementation.74,75

Some limitations of the present study should be considered in the interpretation of the results. First, we took the perspective that generally PHC-based interventions are effective when they are delivered as intended. However, we still need to identify the active ingredients within PA intervention components and the conditions under which interventions are effective.76 Second, because of the cross-sectional design of the study, no causal relationships could be determined. One of the main limitations of the present study was the use of a self-report questionnaire to assess implementation fidelity; the possibility of socially desirable responses may have led to more favorable ratings of completeness and quality of delivery. Specifically, it might be problematic to ask physical therapists to rate the quality of their own practices, which, in this study, was operationalized by a series of satisfaction questions. Moreover, it may be difficult for physical therapists to recall their behaviors with regard to specific tasks (ie, recall bias). Researchers may want to use other methods, such as observation, medical records data, and patient self-report, to assess physical therapists' implementation behaviors. However, because all of these methods have their own advantages and disadvantages,77 a comprehensive assessment of physical therapists' practices may require multiple data collection methods.78 These issues emphasize the need for studies of instruments designed to reliably measure physical therapists' completeness and quality of delivery of PA interventions, including the use of a combination of data collection methods.

Another limitation is related to the 55.2% response rate, which suggests a potential selection bias of study recruitment. In addition, comparisons of respondents and nonrespondents indicated that the latter were significantly older and had more practice experience. Although the response rate is similar to those reported by Shirley et al9 and van der Wees et al,79 our respondents may have been physical therapists who found it more important to deliver PA interventions following the intervention protocol. This possibility may explain the high scores for implementation fidelity and little variation between them, limiting the generalizability of our results. The sample used for the present study comprised physical therapists delivering PA interventions to people with COPD, diabetes, arthritis, and obesity. Although the study sample was a heterogeneous group, the PA interventions delivered to the patients may have been more similar to each other than other types of PA interventions, such as those given to people with low back pain. Therefore, our findings should be interpreted with caution and cannot automatically be generalized to physical therapists delivering PA interventions to other target groups. Finally, we did not ask respondents about their reasons for not following the intervention protocol. We recommend inclusion of this question in future research, as deviation from the protocol may be valuable; for example, an intervention may need to be tailored to an individual patient's needs. In addition, deviations can provide information on how to improve existing guidelines.

To our knowledge, this is the first study to investigate physical therapists' completeness and quality of delivery of PA interventions in general as well as the theory-based factors potentially influencing their implementation behaviors. Exploring influencing factors with a TDF-based questionnaire can help identify theories that can be used to further investigate the implementation of PA interventions.54 Knowledge about which factors influence physical therapists' implementation fidelity can inform the development of strategies to promote the effective implementation of PA interventions, which, in turn, can enhance the public health impact of evidence-based PA interventions.15,23,39–42 With regard to the first and second research questions, respondents reported that they delivered PA interventions to most of the patients receiving interventions and that they were satisfied with the quality that they provided. On the basis of the most important TDF domains associated with completeness and quality of delivery, it can be hypothesized that implementation fidelity may be enhanced by developing implementation strategies that increase physical therapists' capabilities, beliefs about capabilities, beliefs about consequences, positive emotions, the quality of implementation plans, and the automaticity of delivery of PA interventions following the intervention protocol (ie, the third research question). Future studies should focus on investigating causal relationships between factors and implementation behaviors and should incorporate more objective measures of implementation fidelity. Finally, when theory-based determinants are targeted by implementation strategies, well-specified behavior change techniques should be used,76 and their effectiveness should be investigated in randomized controlled trials.

Appendix 1.

Appendix 1.
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Appendix 1.

Physical Activity (PA) Intervention Components, Tasks, and Sample Items Measuring Implementation Fidelitya

a The questionnaire was developed in Dutch. For the purpose of this article, all items were translated into English. PAR-Q=Physical Activity Readiness Questionnaire, 6MWT=Six-Minute Walk Test. The core components (and their underlying tasks) of PA interventions shown in Appendix 1 are based on evidence-based protocols recommended by the Royal Dutch Society for Physical Therapy (KNGF) for the delivery of PA interventions to people with chronic obstructive pulmonary disease, diabetes, arthritis, and obesity.29 The PA intervention protocols recommended by the KNGF provide general information on PA and background information on the specific condition the protocol addresses and describe how physical therapists can promote PA in an evidence-based way. Moreover, the KNGF has developed an additional document29 that describes chronic conditions and health care in the Netherlands, PA in people with a chronic condition, and theories on changing PA behavior. Specifically, several important theories on behavior and behavior change are discussed. With regard to individual theories, the factors that influence PA behavior are described, and strategies that physical therapists can use to promote PA behavior are presented. Examples of factors and strategies to promote PA behavior are as follows:

  1. Attitudes: It is important for physical therapists to know how their patients think about PA. Attitudes can be influenced by discussing advantages and disadvantages of PA so as to alter incorrect presumptions and reinforce correct presumptions.80

  2. Self-efficacy: Physical therapists should assess their patients' self-efficacy and to what extent this factor inhibits PA behavior change. Self-efficacy can be influenced by training skills, which can be provided to patients through graded tasks.80

  3. Motivation: Motivational interviewing can be used to influence patients' motivation to change their PA behavior. Goal setting, monitoring behavior, and the provision of feedback on goal achievement are important elements of motivational interviewing. Furthermore, expressing empathy about patients' ambivalence and developing discrepancy with regard to their old behaviors is an example of a motivational interviewing strategy.81

Appendix 2.

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Appendix 2.

Determinants of Implementation Behavior Questionnairea

a Reprinted with permission from: Huijg JM, Gebhardt WA, Dusseldorp E, et al. Measuring determinants of implementation behavior: psychometric properties of a questionnaire based on the Theoretical Domains Framework. Implement Sci. 2014;9:33. PA=physical activity, PT=physical therapist.

Footnotes

  • Ms Huijg, Dr Gebhardt, Dr Verheijden, Dr van der Zouwe, Dr Middelkoop, and Dr Crone provided concept/idea/research design. Ms Huijg, Dr Dusseldorp, Dr Gebhardt, and Dr Crone provided writing. Ms Huijg provided data collection and participants. Ms Huijg, Dr Dusseldorp, Dr Gebhardt, Dr van der Zouwe, Dr Middelkoop, and Dr Crone provided data analysis. Ms Huijg and Dr Gebhardt provided project management. Dr Gebhardt, Dr Verheijden, and Dr Crone provided fund procurement. Dr Dusseldorp, Dr Gebhardt, Dr Verheijden, Dr van der Zouwe, Dr Middelkoop, Ms Duijzer, and Dr Crone provided consultation (including review of manuscript before submission).

  • This study was approved by the Medical Ethics Committee of Leiden University Medical Center (reference no. NV/CME 09/081).

  • An oral presentation of the results of this study was given at the 27th European Health Psychology Conference; July 17– 20, 2013; Bordeaux, France.

  • This research was funded by ZonMw, the Netherlands Organisation of Health Research and Development.

  • Received September 30, 2013.
  • Accepted August 6, 2014.
  • © 2015 American Physical Therapy Association

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Vol 95 Issue 4 Table of Contents
Physical Therapy: 95 (4)

Issue highlights

  • Effect of Taping on Spinal Pain and Disability
  • Daily Exercises and Education for Preventing Low Back Pain in Children
  • Physical Activity Levels After Lung Transplantation
  • Patients With Cancer Referred for Outpatient Physical Therapy
  • Implementation of Physical Activity Interventions
  • Integrated Knowledge-to-Action Study in a Dutch Rehabilitation Stroke Unit
  • Evidence-Based Practice Skills and Behaviors of Physical Therapy Graduates
  • Research and Practice in Balance and Gait Assessment
  • Evidence-Based Practice Implementation: Case Report
  • Peer Assessment Approach to Enhance Guideline Adherence
  • Knowledge Translation Program in an Outpatient Pediatric Physical Therapy Clinic
  • Contribution of Conceptual Frameworks
  • Self-Management in Prosthetic Rehabilitation
  • Best Practice Recommendations for Online Knowledge Translation
  • Translating Knowledge in Rehabilitation
  • Implementing Treatment Frequency and Duration Guidelines
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Factors Associated With Physical Therapists' Implementation of Physical Activity Interventions in the Netherlands
Johanna M. Huijg, Elise Dusseldorp, Winifred A. Gebhardt, Marieke W. Verheijden, Nicolette van der Zouwe, Barend J.C. Middelkoop, Geerke Duijzer, Mathilde R. Crone
Physical Therapy Apr 2015, 95 (4) 539-557; DOI: 10.2522/ptj.20130457

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Factors Associated With Physical Therapists' Implementation of Physical Activity Interventions in the Netherlands
Johanna M. Huijg, Elise Dusseldorp, Winifred A. Gebhardt, Marieke W. Verheijden, Nicolette van der Zouwe, Barend J.C. Middelkoop, Geerke Duijzer, Mathilde R. Crone
Physical Therapy Apr 2015, 95 (4) 539-557; DOI: 10.2522/ptj.20130457
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    • Appendix 1.
    • Appendix 2.
    • Footnotes
    • References
  • Figures & Data
  • Info & Metrics
  • PDF

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Subjects

  • Health and Wellness/Prevention

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