Fig. 4. Mean electromyographic (EMG) activity of the soleus (Sol), medial gastrocnemius (MG) and tibialis anterior (TA) muscles relative to maximal voluntary contraction (%MVC) during dorsiflexion motor control tests performed at 10 and 50% MVC. The x-axis is labeled as for Fig.1. Values are means ± S.E.M.; N=4, except for F2/3 (N=3). R+15 was excluded for the TA as only one subject’s recordings were valid. Colored symbols and lines indicate significant differences as in Fig.2. The Sol mean EMG amplitude was lower pre- than in-flight for the 10% (P=0.0001) and 50% (P=0.0002) MVC tasks. The MG mean EMG amplitude was lower pre- than in-flight for the 10% (P=0.05) and 50% (P=0.002) MVC tasks. The TA mean EMG amplitude was lower pre- than in-flight for the 10% (P=0.03) and 50% (P=0.02) and lower pre- than post-flight for the 50% (P=0.05) MVC tasks. The P levels for the ANOVA main effects are shown.
