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Related Experiment Videos

Change in double product during stepwise incremental exercise.

Kyu Tae Kim1, Seung Wook Choi, Kazufumi Takahashi

  • 1Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan. kyutae73@hiroshima-u.ac.jp

Journal of Physiological Anthropology and Applied Human Science
|June 17, 2003
PubMed
Summary

This study found a distinct break-point in double product during graded exercise, indicating physiological changes even at lower workloads. This finding is crucial for understanding exercise intensity and cardiovascular response.

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Response
  • Sports Science

Background:

  • Understanding the relationship between exercise intensity and cardiovascular markers is essential for assessing physical exertion.
  • The double product, a measure of myocardial workload, is influenced by heart rate and blood pressure.
  • Previous research has explored double product changes during exercise, but specific break-point analysis at lower workloads requires further investigation.

Purpose of the Study:

  • To observe the changes in double product in response to increasing bicycle exercise intensity.
  • To identify potential break-points in the double product during graded exercise.
  • To determine if these break-points occur at relatively low exercise workloads.

Main Methods:

  • Eleven healthy young male adults underwent graded bicycle ergometry.

Related Experiment Videos

  • Exercise intensity increased by 20 watts every 2 minutes until a heart rate of 170 beats/min was reached.
  • Systolic blood pressure and heart rate were continuously monitored throughout the exercise test.

    • Main Results:

    • Systolic blood pressure initially increased with workload, then slowed its rate of increase at higher intensities.
    • Heart rate showed minimal increase initially, with a higher rate of increase as exercise intensity escalated.
    • Polygonal regression analysis identified clear break-points in the double product, averaging 6.6 minutes (56 watts).

    Conclusions:

    • A significant break-point in double product was observed during graded exercise.
    • This physiological marker of myocardial workload change occurred at a relatively low exercise intensity.
    • The findings suggest a distinct shift in cardiovascular regulation during submaximal exercise.