| Autor: |
Yamada, Eiji, Kusaka, Takashi, Tanaka, Satoshi, Mori, Satoshi, Norimatsu, Hiromichi, Itoh, Susumu |
| Předmět: |
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| Zdroj: |
Journal of Sport Rehabilitation; Nov2004, Vol. 13 Issue 4, p287-299, 13p |
| Abstrakt: |
Objective: To investigate changes in motor-unit activity and muscle oxygenation (MO) during isometric contraction with and without vascular occlusion using surface electromyography (EMG) and near-infrared spectroscopy. Design and Setting: MO and EMG of the right vastus medialis muscle were measured during isometric contraction at 30%, 50%, and 70% maximal voluntary contraction (MVC), with and without vascular occlusion. Participants: 6 healthy men. Results: integrated EMG (IEMG) and mean power frequency were significantly higher with vascular occlusion at 30% and 50% MVC. MO reduction at each load was significantly lower with vascular occlusion. A significant positive correlation was found between IEMG and changes in MO level under both conditions. Conclusions:These results suggest that oxygen supply to active muscles was impaired by occlusion and that type ii fibers were then preferentially recruited, which suggests that hypertrophy occurs in low-intensity exercise in patients with limitations resulting from advanced age, pain' or postsurgery limitation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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