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Influence of exercise hyperthermia on exercise breathing pattern.

B J Martin, E J Morgan, C W Zwillich

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |November 1, 1979
    PubMed
    Summary
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    Elevated body core temperature (Tc) during exercise causes a decrease in tidal volume (VT) and an increase in breathing frequency (f). This suggests Tc influences breathing patterns, potentially via the central respiratory pacemaker.

    Area of Science:

    • Exercise Physiology
    • Respiratory Physiology
    • Thermoregulation

    Background:

    • Passive heating increases body core temperature (Tc) and leads to rapid, shallow breathing in resting individuals.
    • The effect of exercise-induced Tc elevation on breathing patterns during physical activity remains less understood.

    Purpose of the Study:

    • To determine if exercise-induced Tc elevation alters breathing patterns, specifically tidal volume (VT) and breathing frequency (f), during prolonged exercise.
    • To investigate the role of Tc in mediating changes in respiratory parameters during exercise.

    Main Methods:

    • Ten subjects performed 47-minute cycle ergometer exercise at 50-60% maximal aerobic capacity, with work rate adjusted to maintain constant ventilation (VE).
    • Body core temperature (rectal) was monitored, and breathing patterns (VT, f, inspiratory time) were assessed during varying exercise intensities before and after the prolonged ride.

    Related Experiment Videos

  • Comparisons were made with breathing pattern changes induced by passive heating.

    • Main Results:

    • During prolonged exercise with constant VE, increased Tc was associated with a significant rise in breathing frequency (f) and a significant fall in tidal volume (VT).
    • The decrease in VT was linked to a reduction in inspiratory time (TI), while breathing drive (VT/TI) and timing (TI/Ttot) remained unchanged.
    • Similar breathing pattern changes were observed following passive heating that induced equivalent Tc elevation.

    Conclusions:

    • Exercise-induced elevation in body core temperature (Tc) directly influences breathing patterns during prolonged exercise, leading to decreased VT and increased f.
    • Increased Tc appears to mediate the fall in VT during exercise, potentially through stimulation of the central respiratory system.
    • These findings highlight the significant role of thermoregulation in respiratory control during physical exertion.