Comparison of potentiated and unpotentiated twitches as an index of muscle fatigue

被引:139
作者
Kufel, TJ
Pineda, LA
Mador, MJ
机构
[1] SUNY Buffalo, Sch Med & Biomed Sci, Dept Med, Div Pulm & Crit Care Med, Buffalo, NY 14215 USA
[2] VA Western New York Healthcare Syst, Buffalo, NY 14215 USA
关键词
magnetic stimulation; muscle fatigue; quadriceps; skeletal muscle; twitch potentiation;
D O I
10.1002/mus.10047
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Recent data suggest that the potentiated twitch is a more sensitive index of contractile fatigue than is the unpotentiated twitch. We hypothesized that after a potentially fatiguing load, the fall in twitch amplitude of the potentiated twitch would be significantly greater than that of an unpotentiated twitch. We compared the response of the potentiated and unpotentiated twitches to a series of potentially fatiguing loads using magnetic stimulation of the femoral nerve in 10 healthy subjects. The baseline unpotentiated quadriceps twitch force (TwQu), potentiated quadriceps twitch force (TwQp), and maximal voluntary contraction (MVC) were 129 +/- 6 N, 198 :L 6 N, and 622 25 N, respectively. During a fatigue protocol that was designed to induce a spectrum of fatigue from mild to marked, the percent fall in quadriceps twitch force was significantly greater for the potentiated method than for the unpotentiated method at all levels of fatigue (P < .005). The within-subject within-day coefficient of variation was 7.5 +/- 0.5% for TwQu and 5.6 +/- 0.9% for TwQp. Thus, TwQp is reproducible and is superior to TwQu for detecting early muscle fatigue. (C) 2002 Wiley Periodicals, Inc.
引用
收藏
页码:438 / 444
页数:7
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