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Scientific article
English

Effects of exercise on maximal instantaneous muscular power of humans

Contributors

Ferretti, Guido; Gussoni, M.; Di Prampero, P. E.; Cerretelli, P.

Published in

Journal of applied physiology: respiratory, environmental and exercise physiology, vol. 62, no. 6, p. 2288-2294

Publication date

1987

Abstract

The maximal instantaneous anaerobic power (w), as determined during a high jump off both feet on a force platform, was measured on eight subjects starting from a resting base line; a base line of steady-state cycloergometric exercise requiring 30, 50, and 70% of individual maximum O2 consumption (VO2max); and a base line of maximal and supramaximal exercise (100 and 120% of VO2max). In addition, w was also measured during the VO2 transients from rest to each of the above work loads. Blood lactate concentration ([Lab]) was determined before and 8 min after the end of each priming load. After the onset of any priming load, w decreases with time reaching in 2 min a steady level that is lower the higher the VO2. For the three lowest work rates, the steady w level is unchanged by increasing the duration of the priming exercise up to 30 min. For low work levels, the decrease of w as a function of VO2 is essentially parallel to that of estimated muscle concentration of ATP ([ATP]). For work levels greater than 60% of VO2max involving a substantial accumulation of lactate, the decrease of w becomes smaller than the estimated drop of muscle [ATP]. This finding is tentatively attributed to an increase of either the mechanical equivalent or of the velocity constant of ATP splitting brought about by the lowering of intracellular muscle pH after lactate accumulation.

Keywords

  • Adenosine Triphosphate/metabolism
  • Adult
  • Humans
  • Lactates/blood
  • Lactic Acid
  • Male
  • Mathematics
  • Muscle Contraction
  • Muscles/ physiology
  • Oxygen Consumption
  • Physical Exertion

UNIGE affiliation entities

Not a UNIGE publication

Citation (ISO format)

FERRETTI, Guido et al. Effects of exercise on maximal instantaneous muscular power of humans. In: Journal of applied physiology: respiratory, environmental and exercise physiology, 1987, vol. 62, n° 6, p. 2288–2294.

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Additional URL for this publication

http://jap.physiology.org/cgi/reprint/62/6/2288.pdf

Journal ISSN

0161-7567
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Technical informations

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06/08/2010 13:46:29

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06/08/2010 13:46:29

Update

14/03/2023 15:58:22

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14/03/2023 15:58:22

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