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Increasing exercise duration does not affect the postexercise elevation in esophageal temperature.

G P Kenny1, P M Denis, N G Boulé

  • 1University of Ottawa, Faculty of Health Sciences, School of Human Kinetics, Ontario.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee
|September 2, 1999
PubMed
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Elevated esophageal temperature after exercise is not solely due to increased body heat. The esophageal temperature threshold for cutaneous vasodilation remained constant regardless of exercise duration.

Area of Science:

  • Exercise Physiology
  • Thermoregulation
  • Human Physiology

Background:

  • Esophageal temperature (Tes) plateaus post-exercise at the threshold for cutaneous vasodilation (ThVD).
  • Sequential exercise bouts increase baseline and end-exercise Tes, with parallel rises in ThVD and postexercise Tes.
  • The role of whole-body heat content in elevated postexercise Tes is unclear.

Purpose of the Study:

  • To investigate if elevated postexercise esophageal temperature is linked to increased whole-body heat content.
  • To determine if exercise duration affects the relationship between ThVD and postexercise Tes plateau.

Main Methods:

  • Nine subjects performed three treadmill exercise bouts (70% VO2 max, 29°C) of 15, 30, or 45 minutes.
  • Each bout was followed by 60 minutes of inactive recovery.

Related Experiment Videos

  • Esophageal temperature and ThVD were monitored throughout the protocol.

    • Main Results:

    • The rise in Tes during exercise significantly increased with duration (1.0°C at 15 min vs. 1.9°C at 45 min).
    • Exercise ThVD (approx. 0.36°C above baseline) and postexercise Tes plateau (approx. 0.40°C above baseline) showed no significant differences across conditions.
    • The relationship between ThVD and postexercise Tes plateau was independent of exercise duration and associated endogenous heat gain.

    Conclusions:

    • Elevated postexercise esophageal temperature is not directly dependent on the amount of endogenous heat gained during exercise of varying durations.
    • The esophageal temperature threshold for cutaneous vasodilation appears to be a stable physiological set point, irrespective of accumulated body heat.