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J Appl Physiol 82: 278-283, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 1, pp. 278-283, January 1997
EXERCISE AND MUSCLE

Pliometric contraction-induced injury of mouse skeletal muscle: effect of initial length

Kam D. Hunter and John A. Faulkner

Department of Physiology and Institute of Gerontology, University of Michigan, Ann Arbor, Michigan 48109-2007

Received 11 January 1996; accepted in final form 27 August 1996.

Hunter, Kam D., and John A. Faulkner. Pliometric contraction-induced injury of mouse skeletal muscle: effect of initial length. J. Appl. Physiol. 82(1): 278-283, 1997.---For single pliometric (lengthening) contractions initiated from optimal fiber length (Lf), the most important factor determining the subsequent force deficit is the work input during the stretch. We tested the hypothesis that regardless of the initial length, the force deficit is primarily a function of the work input. Extensor digitorum longus muscles of mice were maximally activated in situ and lengthened at 2 Lf /s from one of three initial fiber lengths (90, 100, or 120% of Lf) to one of three final fiber lengths (150, 160, or 170% of Lf). Maximal isometric force production was assessed before and after the pliometric contraction. No single mechanical factor, including the work input (r2 = 0.34), was sufficient to explain the differences in force deficits observed among groups. Therefore, the force deficit appears to arise from a complex interaction of mechanical events. With the data grouped by initial fiber length, the correlation between the average work and the average force deficit was high (r2 = 0.97-0.99). Consequently, differences in force deficits among groups were best explained on the basis of the initial fiber length and the work input during the stretch.

fiber length; force deficit; muscle damage; muscle strain; pliometric contractions

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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