Journal of Applied Physiology, Vol 79, Issue 4 1260-1270, Copyright © 1995 by American Physiological Society

ARTICLES

Muscle function and protein metabolism after initiation of eccentric contraction-induced injury

D. A. Lowe, G. L. Warren, C. P. Ingalls, D. B. Boorstein and R. B. Armstrong
Muscle Biology Laboratory, Texas A&M University, College Station, 77843-4243, USA.

This study was designed to determine the relationship between skeletal muscle function and protein metabolism after initiation of eccentric contraction-induced injury. Mouse anterior crural muscles were injured in vivo, and then either immediately or 3, 6, 24, 48, 72, 120, or 336 h after injury muscles were isolated and studied for indexes of muscle function, injury, phagocyte infiltration, and protein metabolism. A group of mice were administered anti-polymorphonuclear cell and anti-macrophage antisera in an attempt to reduce phagocytic infiltration into injured muscle. Force production in extensor digitorum longus muscles was reduced 55% immediately after injury induction and did not recover significantly until 120 h postinjury (28% below baseline). However, rates of protein degradation were not elevated until 48 h postinjury (60% above normal) and were not correlated with the changes in force production (r = -0.37; P = 0.24). Phagocytic infiltration was evident 24-120 h postinjury and was correlated with the elevated protein degradation rates (r = 0.75; P < 0.01). Protein synthesis rates began to increase approximately 48 h after injury was induced and were elevated by 83% 5 days postinjury. Fourteen days after injury, muscle protein degradation and synthesis rates had returned to normal, as well as specific force production, and phagocytic infiltration was not detected. However, muscle mass, protein content, and absolute force production were lower than normal. Antisera-treated mice were rendered neutropenic, but there was no difference in any variable measured between muscles from these mice and muscles from normal mice.

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