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Arroyo - Morales et al. (3) demonstrated a significant decrease of vastus medialis EMG during 40 minutes of massage on the quadriceps. (journals.lww.com)
However, Nisoli's team found that the BCAAem restores the fiber cross-sectional area of vastus, gastrocnemius, and tibialis muscles of B6129SF2 mice, improves their endurance, whether they are sedentary or exercised, and improves their motor coordination, particularly if they are exercised. (jax.org)
This muscle is called vastus medialus and it helps stabilize the knee and guard it against injury. (fitnessandpower.com)