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Maximal explosive power and aerobic exercise in humans.

C Capelli1, P E di Prampero

  • 1Università degli studi di Udine.

Schweizerische Zeitschrift Fur Sportmedizin
|September 1, 1991
PubMed
Summary

Maximal explosive power (wmax) in humans is significantly higher than maximal oxygen uptake (VO2max). High-intensity exercise, especially after aerobic exertion, reduces explosive power due to decreased high-energy phosphate levels in muscles.

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Area of Science:

  • Exercise Physiology
  • Human Performance
  • Sports Science

Background:

  • Maximal explosive power (wmax) is crucial for short-duration, high-intensity activities.
  • In non-athletic individuals, wmax is approximately 12-17 W*kg-1, significantly exceeding VO2max.
  • Peak power during vertical jumps (w) is higher in athletes (70-75 W*kg-1) than non-athletes (50-55 W*kg-1).

Purpose of the Study:

  • To investigate the impact of prior aerobic exercise on maximal explosive power.
  • To understand the physiological mechanisms underlying changes in explosive power during high-intensity efforts.

Main Methods:

  • Assessed maximal explosive power (wmax) during cycling and uphill running.
  • Measured peak instantaneous power (w) during vertical jumps.
  • Evaluated the effects of pre-exercise aerobic exertion at varying intensities on explosive power metrics.

Main Results:

  • Both wmax and w decrease when preceded by aerobic exercise, particularly when approaching VO2max.
  • Explosive power can be reduced to approximately 75% of its resting value after intense aerobic priming.
  • This reduction is proportionally linked to the depletion of muscle high-energy phosphates.

Conclusions:

  • Athletes can maintain a significant portion of their maximal absolute power during high-intensity efforts, even after aerobic exercise.
  • The decline in explosive power is primarily attributed to the reduction in high-energy phosphate availability within the muscle.
  • Understanding these physiological limitations is key for optimizing training and performance in explosive activities.

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