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Monitoring high-intensity endurance exercise with heart rate and thresholds

M R Boulay1, J A Simoneau, G Lortie

  • 1Physical Activity Sciences Laboratory, Laval University, Ste-Foy, Québec, Canada. Marcel.Boulay@edp.ulaval.ca

Medicine and Science in Sports and Exercise
|January 1, 1997
PubMed
Summary

Ventilatory and lactate thresholds help determine sustainable exercise intensity. However, only heart rate and VO2 at the ventilatory threshold reliably indicate highest work intensity during prolonged exercise.

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Area of Science:

  • Exercise Physiology
  • Sports Science

Background:

  • Ventilatory and lactate thresholds are proposed metrics for assessing sustainable exercise intensity.
  • Establishing the highest steady-state intensity during prolonged exercise is crucial for performance.

Purpose of the Study:

  • To determine if ventilatory threshold intensity is sustainable during prolonged high-intensity exercise.
  • To assess if work rate, ventilation, and blood lactate align with the ventilatory threshold during extended exercise.

Main Methods:

  • Fifteen healthy males underwent a VO2max test and a 90-minute high-intensity ergocycle test.
  • Physiological parameters including heart rate, gas exchange (VO2, VCO2, FeO2, FeCO2), and blood lactate were monitored.

Main Results:

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  • Subjects maintained an intensity 5 beats/min below their ventilatory threshold heart rate.
  • While heart rate and VO2 remained stable for portions of the test, work output, ventilation, and blood lactate decreased.
  • Blood lactate fluctuated significantly, failing to predict sustainable work intensity.

    • Conclusions:

    • Physiological parameters near the ventilatory threshold are not interchangeable for monitoring prolonged high-intensity exercise.
    • Heart rate and VO2 at the ventilatory threshold appear to be more suitable markers for predicting sustainable exercise intensity.