Changes in the Linear Relationship between Muscle Contraction Intensity and Muscle Hardness after Rectus Femoris Muscle Strain

Figure 2

Changes in strain ratio relative to isometric contraction intensity (10%, 20%, 30%, and 40% of maximal voluntary isometric contraction) for the healthy (a) and rehabilitated (b) legs of six subjects. Each subject is indicated by a different symbol, but same symbols are used for the healthy and rehabilitated legs. For each graph, the average values of the six subjects are shown using open (healthy legs) and closed (rehabilitated legs) circles. Significantly () different from the 10% of maximal voluntary isometric contraction. A.U.: arbitrary units.