Mohr K J, Pink M M, Elsner C, Kvitne R S
Biomechanics Laboratory, Centinela Hospital Medical Center, Inglewood, California, USA.
Clin J Sport Med. 1998 Jul;8(3):215-20. doi: 10.1097/00042752-199807000-00009.
To compare the fine wire electromyographic (EMG) firing patterns during static stretches in the biceps femoris, soleus, and gastrocnemius before and after warm-up as well as over time.
Experimental single group pretest-posttest design.
Biomechanics research laboratory.
Sixteen healthy volunteers 23 to 36 years of age with no history of lower extremity injury.
Subjects performed one hamstring stretch and four calf stretches for 90 seconds, bicycled for 30 minutes as a warm-up, and stretched again.
EMG was recorded at time 0, 30, 60, and 90 seconds during the stretches before and after warm-up. Recorded values were normalized to EMG during maximum manual muscle testing (MMT). A two-way analysis of variance with repeated measures (p < 0.05) was done to compare EMG activity during stretching before and after warm-up as well as over time.
Low EMG activity was seen for all muscles (< 20% MMT). It was constant over the time of the stretch for all muscles, but it increased in the soleus during the bent knee stretch position. There was a statistically significant decrease in the EMG activity after the warm-up for the gastrocnemius using the traditional and heel off stretching positions and for the soleus using the heel off stretching position (p < 0.05). The biceps femoris EMG activity showed no significant differences before and after warm-up.
EMG activity during static stretching was low. Overall, the EMG activity remained constant with time for a given stretch position. EMG of the soleus and gastrocnemius was significantly less after warm-up for some stretches, whereas the EMG activity of biceps femoris showed no differences before and after warm-up.
比较热身前后以及随时间推移，股二头肌、比目鱼肌和腓肠肌在静态拉伸过程中的细针肌电图（EMG）放电模式。
实验性单组前后测设计。
生物力学研究实验室。
16名年龄在23至36岁之间、无下肢损伤史的健康志愿者。
受试者进行一次绳肌拉伸和四次小腿拉伸，每次90秒，骑自行车30分钟作为热身，然后再次进行拉伸。
在热身前后的拉伸过程中，于0、30、60和90秒记录EMG。记录值在最大手动肌力测试（MMT）期间以EMG进行标准化。采用重复测量的双向方差分析（p<0.05）来比较热身前后以及随时间推移的拉伸过程中的EMG活动。
所有肌肉的EMG活动均较低（<20%MMT）。在整个拉伸过程中，所有肌肉的EMG活动保持恒定，但在屈膝拉伸位置时，比目鱼肌的EMG活动增加。在使用传统和足跟离地拉伸位置时，腓肠肌热身后的EMG活动以及在使用足跟离地拉伸位置时比目鱼肌热身后的EMG活动均有统计学显著下降（p<0.05）。股二头肌的EMG活动在热身前后无显著差异。
静态拉伸过程中的EMG活动较低。总体而言，在给定的拉伸位置，EMG活动随时间保持恒定。对于某些拉伸，热身后比目鱼肌和腓肠肌的EMG显著降低，而股二头肌的EMG活动在热身前后无差异。
