ISSN:
1439-6327
Schlagwort(e):
Key words Constant work
;
Muscle action speed
;
Power-velocity relationship
;
Pacing strategies
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Medizin
Notizen:
Abstract The purpose of the present study was to establish whether the performance of an all-out sprint could be replicated and the metabolic responses moderated in two further trials involving pre-set constant average pedalling rates. A total of 24 subjects (12 males and 12 females) completed a 30-s high-speed maximal all-out effort on a cycle ergometer against an applied resistance equal to 7.5% of their body mass. On two further occasions the applied resistance was increased so that the external work of the all-out effort could be replicated by adopting a pre-determined constant average pedal rate. When the required pedal rate was within the range of 60–90 rev · min−1 the subjects were able to maintain the rate for the full 30-s and so could replicate the external work of the all-out effort. They were unable to sustain a faster constant rate within the range of 97–150 rev · min−1 for the full 30 s, resulting in ≈7% less external work being achieved (P 〈 0.05). A lower level of fatigue, reflected by less of a reduction in peak power output in a subsequent 6-s sprint (P 〈 0.05), arose as a result of similar work produced under constant paced conditions compared with the all-out effort. Also, post-exercise blood lactate, pH and ammonia were less disturbed (P 〈 0.05) following the paced trial compared with similar work produced in the all-out effort. A possible explanation for these findings is that there may be a partial sparing of some type II fibres as a consequence of an initial submaximal intensity of exercise during the paced trial.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/s004210050121
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