To elucidate the most effective way to recover from muscle fatigue, twitch force, maximal voluntary plantar flexion force and EMG signal during constant force output were measured progressively before and after experimentally induced fatigue in triceps surae. Vibratory massage, static stretching and moderate jogging, which were adopted for the treatments of recover from fatigue, were performed after fatigue at the separate day. Muscle fatigue was induced by calf raise with one leg.
　Maximal voluntary contraction (MVC) returned faster in all three recover treatments compared with control. Root mean square value of EMG (RMS) and mean power frequency (MPF) of gastrocnemius decreased while soleus RMS increased after fatigue. These values showed little difference among treatments. Maximal twitch contraction force (Pt), maximal rate of tension development (+dF/dt), relaxation (-dF/dt), mean contraction speed (Pt/CT) and relaxation speed (Pt/HRT) decreased after fatigue. These values returned faster in jogging than any other treatment. On the other hand, the subjects felt that massage was most comfortable and there was little symptom of delayed muscle soreness by massage and stretching.
　These results suggested that moderate exercise of the whole body, i. e. jogging was the most effective way to recover the contractile functions from fatigue while stretching and massage were effective to muscle injury and mental fatigue, respectively. Thus, moderate exercise, stretching and massage were all recommended for recover from fatigue.

DESCENTE SPORTS SCIENCE Vol.13/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE