Fig. 2

Simultaneous EMG recordings from the lateral gastrocnemius (LG), medial gastrocnemius (MG), and soleus (Sol) muscle during static contractions at 10% maximal voluntary contraction (MVC). The bottom line (angle) indicates ankle joint angles. Continuous EMG recordings during static contractions at an ankle joint angle of 100° (a) and 120° (c), respectively. Note the difference in time to first recruitment of LG between 100° and 120°. Few events of alternating muscle activity were shown, although each muscle showed repeated fluctuations in EMG activity with increasing time. b An example of clear alternation of EMG activity during static contractions at 110°. Note that EMG activities are switched from MG to LG + Sol with increasing duration of contractions. All traces (a–c) were obtained from the same subject