Muscle injury has been documented following eccentric exercise bouts in skeletal muscle (Faulkner 1985, Duan et al. 1988, Lieber & Fride!n 1988). Insights into the early events causing muscle injury have been obtained from mechanical studies (Lieber & Fride!n 1993, Warren et al. 1993) as well as immunohistochemical studies of cellular and extracellular proteins (Lieber et al. 1996). From these ...