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Effects of rate of decrease in power output in decrement-load exercise on oxygen uptake.

T Yano1, T Yunoki, R Matsuura

  • 1Laboratory of Exercise Physiology, Graduate School of Education, Hokkaido University, Sapporo, Japan. yano@edu.hokudai.ac.jp

Physiological Research
|November 8, 2006
PubMed
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Faster rates of decrease in power output during exercise did not alter initial oxygen uptake (Vo2) but reduced excessive Vo2 (ex-Vo2) and increased the difference between decrement-load exercise (DLE) and incremental-load exercise (ILE) Vo2 (DeltaVo2).

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Sports Science

Background:

  • Oxygen uptake (Vo2) dynamics during exercise transitions are crucial for understanding metabolic responses.
  • Decrement-load exercise (DLE) involves a reduction in power output, with its physiological effects still under investigation.
  • Previous research has not fully elucidated the impact of varying rates of power decrease on Vo2 kinetics during DLE.

Purpose of the Study:

  • To investigate the effect of different rates of power output decrease on oxygen uptake (Vo2) during decrement-load exercise (DLE).
  • To analyze how excessive oxygen uptake (ex-Vo2) and the difference in Vo2 between DLE and incremental-load exercise (ILE) (DeltaVo2) are influenced by the rate of power decrease.

Main Methods:

  • Participants performed DLE at three distinct rates of power decrease (10, 20, and 30 watts/min) from 90% of peak Vo2.

Related Experiment Videos

  • Oxygen uptake (Vo2) was continuously measured throughout the exercise protocols.
  • The relationship between Vo2 and power output below 50 watts was used to estimate excessive Vo2 (ex-Vo2) and DeltaVo2.

    • Main Results:

    • Vo2 kinetics showed an initial exponential increase followed by a decrease, with the rate of decrease slowing at lower power outputs.
    • No significant differences in Vo2 were observed during the initial 2 minutes across the different DLE rates.
    • Peak ex-Vo2 was significantly greater in the slowest DLE rate (DLE10) compared to faster rates (DLE20, DLE30).
    • DeltaVo2 increased progressively with faster DLE rates, being smallest in DLE10 and largest in DLE30.

    Conclusions:

    • A faster rate of decrease in power output during DLE leads to reduced ex-Vo2 and increased DeltaVo2.
    • These findings suggest that oxygen uptake is distributed in parallel across motor units during DLE, influenced by the rate of power reduction.
    • The study provides insights into the metabolic control mechanisms during non-steady-state exercise conditions.