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Related Experiment Videos

Maximal oxygen uptake, heat tolerance and rectal temperature

E Shvartz, Y Shapiro, H Birnfeld

    Medicine and Science in Sports
    |January 1, 1978
    PubMed
    Summary

    Maximal oxygen uptake (Vo2max) influences core body temperature during exercise. Heat acclimatization further impacts rectal temperature (Tre) regulation, especially in cooler conditions.

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    Area of Science:

    • Exercise Physiology
    • Environmental Physiology
    • Human Thermoregulation

    Background:

    • Maximal oxygen uptake (Vo2max) is a key indicator of aerobic fitness.
    • Thermoregulation during exercise is influenced by fitness level and heat acclimatization.
    • Understanding core body temperature regulation is crucial for exercise performance and safety.

    Purpose of the Study:

    • To investigate the relationship between maximal oxygen uptake (Vo2max) and rectal temperature (Tre) during exercise.
    • To assess the impact of heat acclimatization on thermoregulation during exercise in cool and hot environments.
    • To determine the combined influence of Vo2max and heat acclimatization on exercise core temperature.

    Main Methods:

    • Recruited untrained, trained, and heat-acclimated subjects.
    • Assessed Vo2max in ml/kg/min for all groups.
    • Subjects performed exercise at a fixed workload (35 W) and at a relative intensity (35% Vo2max) in cool conditions (23°C).
    • Exercise in heat was conducted for 3 hours at 40°C dry bulb/30°C wet bulb.
    • Measured rectal temperature (Tre) and heart rate throughout the protocols.

    Main Results:

    • Heat-acclimated subjects exhibited superior heat tolerance compared to untrained individuals.
    • At a fixed workload (35 W), untrained subjects had higher heart rates and higher equilibrium Tre compared to trained and heat-acclimated groups.
    • During exercise at 35% Vo2max, heat-acclimated individuals maintained lower Tre than trained individuals.
    • Rectal temperature during exercise at 35 W in cool conditions showed a strong negative correlation with Vo2max (r = -0.70) and a strong positive correlation with Tre during exercise in heat (r = 0.80).

    Conclusions:

    • Vo2max partially explains the variation in core body temperature during exercise in cool conditions.
    • Heat acclimatization significantly contributes to the regulation of rectal temperature, particularly in cooler environments.
    • Both aerobic fitness and heat acclimatization are critical determinants of thermoregulatory responses during physical exertion.

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