McHugh, Connolly, Eston and Gleim (2000) Electromyographic analysis of exercise resulting in symptoms of muscle damage

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Electromyographic analysis of exercise resulting in symptoms of muscle damage

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CONTRIBUTORS:

	Author:	McHugh, M. P.
	Author:	Connolly, D. A. J.
	Author:	Eston, R. G. (University of Bangor)
	Author:	Gleim, G. W.

JOURNAL:

Journal of Sports Sciences (JSS), 18(3), ?? - ??.

YEAR:

2000

PUB TYPE:

Journal Article

SUBJECT(S):

MUSCLE-CONTRACTION; HAMSTRING; EXERCISE; MUSCLE; INJURY; COMPARATIVE-STUDY; ELECTROMYOGRAPHY; ISOMETRIC

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-750 (Last edited on 2002/02/27 18:44:58 US/Mountain)

SPONSOR(S):

ABSTRACT:
Surface electromyographic (EMG) signals were recorded from the hamstring muscles during six sets of submaximal isokinetic (2.6 rad.s-1) eccentric (11 men, 9 women) or concentric (6 men, 4 women) contractions. The EMG per unit torque increased during eccentric (P < 0.01) but not during concentric exercise. Similarly, the median frequency increased during eccentric (P < 0.01) but not during concentric exercise. The EMG per unit torque was lower for submaximal eccentric than maximum isometric contractions (P < 0.001), and lower for submaximal concentric than maximum isometric contractions (P < 0.01). The EMG per unit torque was lower for eccentric than concentric contractions (P < 0.05). The median frequency was higher for submaximal eccentric than maximum isometric contractions (P < 0.001); it was similar, however, between submaximal concentric and maximum isometric contractions (P = 0.07). Eccentric exercise resulted in significant isometric strength loss (P < 0.01), pain (P < 0.01) and muscle tenderness (P < 0.05). The greatest strength loss was seen 1 day after eccentric exercise, while the most severe pain and muscle tenderness occurred 2 days after eccentric exercise. A lower EMG per unit torque is consistent with the selective recruitment of a small number of motor units during eccentric exercise. A higher median frequency during eccentric contractions may be explained by selective recruitment of fast-twitch motor units. The present results are consistent with the theory that muscle damage results from excessive stress on a small number of active fibers during eccentric contractions.

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