Fig. 2. Mean electromyographic (EMG) activity of the soleus (Sol), medial gastrocnemius (MG) and tibialis anterior (TA) muscles relative to maximal voluntary contraction (%MVC) during plantarflexion 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 indicate significant differences as in Fig.1. Red lines identify significant contrasts between pairs of adjacent data points. For the Sol, in-flight EMG amplitude was elevated above pre-flight values for both the 10% (P=0.02) and 50% MVC (P=0.002) tasks. No differences were observed in MG EMG amplitude. For the TA, in-flight (P=0.01) and post-flight (P=0.05) EMG amplitudes were elevated above pre-flight values for the 50% MVC task. The P levels for the ANOVA main effects are shown.
