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Change in muscle mass of biceps brachii and rectus femoris. Muscle mass of both biceps brachii and rectus femoris progressively decreased. a Biceps brachii thickness and cross-sectional area statistically significantly (p < 0.01) decreased. b Rectus femoris thickness and cross-sectional area statistically significantly (p < 0.01) decreased. p values were derived from a generalized linear mixed model. Data are expressed as means and 95% confidence intervals. CSA cross-sectional area
