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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Muscle Nerve. 2011 Apr;43(4):563–573. doi: 10.1002/mus.21981

Figure 2.

Figure 2

Mean fluctuations in quadriceps muscle force (force steadiness) during submaximal isometric force control testing at 30° (solid) and 90° (broken) of knee flexion. Force steadiness was quantified by calculating the (A) standard deviation, (B) coefficient of variation (Standard deviations normalized to the mean of the exerted force), and (C) percent absolute error of the subjects’ torque curves at various torque targets during isometric force control testing. Quadriceps force steadiness was significantly affected (*) by knee joint angle. Error bars represent standard error of the mean.