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<< Tillbaka| Överskrift | Electromyographic investigation of stretching: the effect of warm-up. |
|---|---|
| Upplaga | 8(3) |
| Sidor | 215-20 |
| Överskrift | Electromyographic investigation of stretching: the effect of warm-up. |
| Beskrivning | OBJECTIVE: 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. DESIGN: Experimental single group pretest-posttest design. SETTING: Biomechanics research laboratory. PARTICIPANTS: Sixteen healthy volunteers 23 to 36 years of age with no history of lower extremity injury. INTERVENTION: Subjects performed one hamstring stretch and four calf stretches for 90 seconds, bicycled for 30 minutes as a warm-up, and stretched again. MAIN OUTCOME MEASURE: 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. RESULTS: 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. CONCLUSIONS: 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. |
| Källa | Clin J Sport Med |
| Publicerad | 1998 |
| Författare | Burke D, Elsner C, Hagbarth KE, Kvitne RS., Löfstedt L, Mohr KJ, Pink MM, Wallin BG |