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MUSCLE SORENESS FOLLOWING RESISTANCE EXERCISE WITH AND WITHOUT ECCENTRIC CONTRACTIONS

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Muscle soreness is often experienced following unaccustomed exercise. This common phenomenon known as delayed onset muscle soreness (DOMS) occurs following such unfamiliar tasks as downhill running (Schwane, Johnson, Vandenakker, and Armstrong, 1983a; Schwane, Watrous, Johnson, & Armstrong, 1983b) and eccentric exercise regimens (Friden, Sjostrom, & Ekblom, 1983). The mechanisms behind DOMS have been evaluated by examining markers of Muscle damage (creadne kinise and lactate dehydrogenase (Newham, Jones, & Edwards, 1983; Schwane et al., I983a; Tiidus & Ianuzzo, 1983)), or connective tissue damage (hydroxyproline [Abraham, 1977)). Muscle damage has also been evaluated by ultrastructure observation of muscle biopsy samples obtained from the affected muscles (Friden et al., 1983). Although still the subject of debate, it appears that DOMS results from either mechanical or ischemic damage to the muscle fibers (Clarkson, Kroll, Graves, & Record, 1982; Friden et al., 1983; Mayer & Clarkson, 1984; Schwane et al., 1983a; Tiidus & lanuzzo, 1983).

Recently, several investigators have provided anecdotal evidence that DOMS does not occur following an initial session of circuit weight training which utilizes isokinetic exercise equipment (Gettmann, Ayers, Pol-. lock, Durstine, & Grantham, 1979; Gettman, Culter, Strathman, 1980). The lack of DOMS with isokinetic exercise may be related to the type of muscular contraction exerted during the exercise. Most forms of exercise have an eccentric component (muscle lengthening against resistance) whereas the isokinetic resistive equipment involves only a concentric component (muscle shortening against resistance). In the present study we evaluated the development of DOMS following the initial bout of two different circuit exercise regimens differing in their eccentric component. Because DOMS has been associated with muscle damage (Friden et al., 1983), serum creatine kinase (CK) activity was also assessed.

 

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