Exercise-induced skeletal muscle damage and adaptation following repeated bouts of eccentric muscle contractions
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1997
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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CREATINE-KINASE; MUSCLE; INJURY; SORENESS; MUSCLE-CONTRACTION
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-540
(Last edited on
2002/02/27 18:45:00 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Repeated bouts of eccentric muscle contractions were used to examine indirect indices of exercise-induced muscle damage and adaptation in human skeletal muscle. Twenty-four subjects (18 feamles, 6 males) aged 20.0 plus/minus 1.4 years (mean plus/minus S.D.) performed an initial bout of either 10 (n = 7), 30 (n = 9) or 50 (n = 8) maximum voluntary eccentric contractions of the knee extensors, followed by a second bout of 50 contractions 3 weeks later using the same leg. Muscle soreness was elevated after all bouts (P is less than 0.05, Wilcoxon test), althought the initial bout reduced the soreness associated with the second bout. Force loss and a decline in the 20:100 Hz percutaneous electrical myostimulation force ratio were observed after all exercise bouts (P is less than 0.01). Serum creatine kinase activity was elevated following the initial bouts of 30 and 50 repetitions (P is less than 0.01), but there was no increase following 10 repetitions. No increase in serum creatine kinase activity was observed in any group following the second bout of contractions. We conclude that skeletal muscle adaptation can be brought about by a single bout of relatively few eccentric muscle contractions. Increasing the number of eccentric muscle repetitions did not result in an increased prophylactic effect on skeletal muscle.
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