The optimal stimulating frequency of soleus and EDL was 60 Hz and 120 Hz in control rats, respectively. It was not changed in 1-week unloaded soleus, but shifted to 80 Hz and 100 Hz in 2-and 4-week unloaded soleus, respectively.

• 结果表明:对照组大鼠SOL强直收缩的最适刺激频率为60 Hz,尾部悬吊1周大鼠SOL的最适刺激频率 亦为60 Hz,尾部悬吊2周后,其最适刺激频率增高为80 Hz,4周后则为100 Hz;