Silva-Couto MA, Prado-Medeiros CL, Oliveira AB, et al. Muscle atrophy, voluntary activation disturbances, and low concentrations of IGF-1 and IGFBP-3 are associated with weakness in people with chronic stroke. Phys Ther. 2014;94:957–967.

doi:10.2522/ptj.20130322.cx

In the article by Silva-Couto et al titled “Muscle Atrophy, Voluntary Activation Disturbances, and Low Concentrations of IGF-1 and IGFBP-3 Are Associated With Weakness in People With Chronic Stroke” in the July 2014 issue of PTJ, an incorrect version of Figure 4 was published. The correct Figure 4 and caption are shown below:

Figure 4.

Muscle activation during maximal voluntary concentric contraction. EMG=electromyography (in millivolts), CL=control limb, NPL=nonparetic limb, PL=paretic limb, RF=rectus femoris, VM=vastus medialis, VL=vastus lateralis, BF=biceps femoris, ST=semitendinosus. *P<.0017. Comparisons are indicated by brackets. Note the decreased RF muscle activation in the PL during concentric extension and decreased BF and ST activity in the PL during concentric flexion.

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Silva-Couto MA, Prado-Medeiros CL, Oliveira AB, et al. Muscle atrophy, voluntary activation disturbances, and low concentrations of IGF-1 and IGFBP-3 are associated with weakness in people with chronic stroke. Phys Ther. 2014;94:957–967.

Physical Therapy Mar 2015, 95 (3) 471; DOI: 10.2522/ptj.20130322.cx