McHugh et al. (2001) Electromyographic analysis of repeated bouts of eccentric exercise

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Electromyographic analysis of repeated bouts of eccentric exercise

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CONTRIBUTORS:

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

JOURNAL:

Journal of Sports Sciences (JSS), 19(3), ?? - ??.

YEAR:

2001

PUB TYPE:

Journal Article

SUBJECT(S):

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

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-803 (Last edited on 2002/02/27 18:44:58 US/Mountain)

SPONSOR(S):

ABSTRACT:
The repeated bout effect refers to the protective effect provided by a single bout of eccentric exercise against muscle damage from a similar subsequent bout. The aim of this study was to determine if the repeated bout was associated with an increase in motor unit activation relative to force production, an increased recruitment of slow-twitch motor units or increased motor unit synchronization. Surface electromyographic (EMG) signals were recorded from the hamstring muscles during two bouts of submaximal isokinetic (2.6 rad.s-1) eccentric (11 men, 9 women) or concentric (6 men, 4 women) contractions separated by 2 weeks. The EMG per unit torque and median frequency were analysed. The initial bout of eccentric exercise resulted in strength loss, pain and muscle tenderness, while the repeated eccentric bout resulted in a slight increase in strength, no pain and no muscle tenderness (bout x time effects, P < 0.05). Strength, pain and tenderness were unaffected by either bout of concentric exercise. The EMG per unit torque and median frequency were not different between the initial and repeated bouts of eccentric exercise. The EMG per unit torque and median frequency increased during both bouts of eccentric exercise (P < 0.01) but did not change during either concentric bout. In conclusion, there was no evidence that the repeated bout effect was due to a neural adaptation.

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