Effect of the number of preceding muscle actions on subsequent peak power output
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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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FATIGUE; MUSCLE; EXERCISE; BICYCLE-ERGOMETRY; CYCLING; ENERGY-METABOLISM; SPRINT-RACING
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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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103-366-542
(Last edited on
2002/02/27 18:45:08 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Many sports events require participants to exert a maximal effort in the closing stages - that is, after prior fatiguing exercise. Peak and mean pedalling rate during 30 s of high -intensity cycle ergometer exercise was manipulated by altering the applied resistance or the initial exercise intensity so that the effect of three contrasting strategies on subsequent peak power output could be examined. Seven female students cycled for 30 s in one of three conditions: (1) all-out effort against an applied resistance of 7.5 percent of body weight (test 1); (2) at a constant pace of 55 percent of the peak pedal rate of test 1 against a resistance of 10.9 plus/minus 0.4 percent of body weight (test 2); (3) all-out effort against the greater resistance (test 3). A 6 s sprint against the lesser resistance was performed 3 s after each test. Total work was greater (P is less than 0.01) in test 3 than in test 1, while mean pedal rate was higher (P is less than 0.01) in test 1 (mean plus/minus S.E.: 10.0 plus/minus 0.4 rad s-1) than in test 2 and 3 (7.2 plus/minus 0.4 and 7.8 plus/minus 7.8 plus/minus 0.3 rad s-1 respectively). The peak power output in the subsequent 6 s sprint was similar following tests 2 and 3 (516 plus/minus 37 and 534 plus/minus 41 W respectively), but was lower following test 1 (420 plus/minus 37 W) (P is less than 0.01, test 1 vs tests 2 and 3). These results indicate that the number of muscle actions during 30 s of fatiguing exercise may exert a considerable influence on one's ability to subsequently produce peak power output. In sports such as cycling where the same external velocity is attainable at different muscle action speeds, then appropriate gear selection during the race will impact on the rider's ability to sprint in the latter stages.
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