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Related Concept Videos

Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
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Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Regulation of Heart Rates01:31

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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Related Experiment Video

Updated: May 13, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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Night and postexercise cardiac autonomic control in functional overreaching.

Olivier Dupuy1, Louis Bherer, Michel Audiffren

  • 1Department of Kinesiology, University of Montreal, Montreal, Quebec, Canada.

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
|February 27, 2013
PubMed
Summary

Overload training in athletes temporarily reduced nighttime heart rate control and improved recovery after maximal exercise. These effects returned to baseline after a taper period, indicating sensitive measures are needed for monitoring.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Autonomic Nervous System

Background:

  • Understanding the impact of training load manipulation on athlete recovery is crucial for performance optimization.
  • Autonomic control of heart rate, particularly parasympathetic activity, is a key indicator of physiological stress and recovery.
  • Previous research has explored overreaching effects, but specific impacts on nocturnal autonomic function and post-exercise heart rate recovery require further investigation.

Purpose of the Study:

  • To investigate the effects of a 2-week overload training period followed by a 1-week taper on heart rate autonomic control during sleep and after exercise cessation in male endurance athletes.
  • To determine if specific heart rate variability (HRV) indices and heart rate recovery (HRR) parameters are sensitive to changes in training load.
  • To assess the reversibility of any observed autonomic changes following a taper period.

Main Methods:

  • Eleven male endurance athletes underwent a 2-week overload (100% training volume increase) and a 1-week taper (50% volume decrease) protocol.
  • Maximal graded and constant-speed exercise tests, followed by 10-min passive recovery, were conducted at baseline, post-overload, and post-taper.
  • Heart rate variability (HRV) was measured during estimated slow-wave sleep and a 4-hour nocturnal period; heart rate recovery (HRR) was assessed post-exercise.

Main Results:

  • Following the overload period, a significant decrease in cardiac parasympathetic control during slow-wave sleep (HFnu) was observed (p < 0.05).
  • Faster heart rate recovery (τ) after the maximal graded exercise test was noted post-overload (p < 0.05), but not after the constant-speed test.
  • All measured parameters returned to baseline levels after the 1-week taper period, and other HRV indices remained unaffected by the overload.

Conclusions:

  • A short period of intense overload training can transiently impair nocturnal cardiac parasympathetic control and alter post-exercise heart rate recovery in endurance athletes.
  • The observed autonomic changes are reversible with a subsequent taper period, suggesting effective recovery strategies.
  • Careful selection of sensitive HRV and HRR measures is essential for accurately monitoring the effects of training load on athletes' autonomic nervous system function.