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Related Experiment Videos

Short-term overtraining: effects on performance, circulatory responses, and heart rate variability.

R Hedelin1, G Kenttä, U Wiklund

  • 1Sports Medicine and Clinical Physiology, Department of Surgical and Perioperative Science, Umeå University, Sweden.

Medicine and Science in Sports and Exercise
|August 19, 2000
PubMed
Summary

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Elite canoeists experienced decreased performance and maximal oxygen uptake after a 6-day high-intensity training camp, indicating overreaching. Heart rate variability (HRV) remained unaffected, suggesting peripheral factors limited performance despite reduced heart rates.

Area of Science:

  • Sports Science
  • Exercise Physiology
  • Human Performance

Background:

  • Elite athletes undergo intense training to optimize performance.
  • Monitoring physiological markers is crucial for managing training load and preventing overtraining.

Purpose of the Study:

  • To investigate the effects of a 6-day high-load training camp on elite canoeists' performance, heart rate variability (HRV), and blood-chemical parameters.
  • To assess physiological adaptations and potential fatigue indicators in response to increased training volume.

Main Methods:

  • Nine elite canoeists participated in a 6-day training camp involving cross-country skiing and strength training, increasing training load by 50%.
  • Performance metrics (time to exhaustion, VO2max, maximal lactate), heart rate (HR) at various workloads, plasma volume, and resting hormone levels (cortisol, adrenaline, noradrenaline) were measured.

Related Experiment Videos

  • Heart rate variability (HRV) was assessed at rest and after a tilt test.

    • Main Results:

    • Time to exhaustion, VO2max, and maximal lactate levels significantly decreased.
    • Submaximal and maximal heart rates were significantly reduced.
    • Plasma volume increased, and resting cortisol levels decreased, while adrenaline and noradrenaline remained unchanged.
    • No significant changes were observed in high or low-frequency HRV.

    Conclusions:

    • The observed reduction in maximal performance suggests a state of fatigue or overreaching in the canoeists.
    • Peripheral factors likely limited performance, despite reductions in maximal heart rate and lactate.
    • Increased plasma volume may explain the reduced submaximal heart rates.
    • Short-term overtraining did not significantly affect HRV in this elite athlete group.