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Related Experiment Videos

Muscle temperature transients before, during, and after exercise measured using an intramuscular multisensor probe.

G P Kenny1, F D Reardon, W Zaleski

  • 1Faculty of Health Sciences, School of Human Kinetics, Faculty of Medicine, and Faculty of Sciences, University of Ottawa, Ottawa, Canada K1N 6N5. gkenny@uottawa.ca

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 25, 2003
PubMed
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During exercise, muscle temperature significantly increased, while core body temperature rose slightly. Post-exercise, elevated muscle temperature may contribute to a sustained increase in core body temperature.

Area of Science:

  • Exercise Physiology
  • Human Thermoregulation
  • Muscle Metabolism

Background:

  • Understanding core body temperature regulation during and after exercise is crucial for performance and health.
  • Muscle temperature changes during exercise and their impact on core temperature are not fully elucidated.

Purpose of the Study:

  • To investigate the relationship between muscle temperature and core body temperature during and after submaximal knee extension exercise.
  • To determine if residual heat from active muscles influences post-exercise core temperature.

Main Methods:

  • Seven subjects underwent an incremental isotonic test to determine maximal oxygen consumption (Vo2 sp).
  • Multisensor thermal probes were inserted into the vastus medialis muscle to measure intramuscular temperatures at varying depths (Tμ10, Tμ25, Tμ40).

Related Experiment Videos

  • Esophageal temperature (Tes) was measured as an index of core temperature during rest, 15 minutes of exercise (60% Vo2 sp), and 60 minutes of recovery.

    • Main Results:

    • Exercise increased core temperature by 0.55°C and muscle temperatures by 2.00°C (Tμ10), 2.37°C (Tμ25), and 3.20°C (Tμ40).
    • Post-exercise, core temperature showed a sustained elevation of ~0.3°C above resting levels.
    • Muscle temperatures remained significantly elevated throughout the recovery period, by 0.92°C (Tμ10), 1.05°C (Tμ25), and 1.77°C (Tμ40) at the end of recovery.

    Conclusions:

    • Exercise significantly elevates both core and muscle temperatures.
    • Elevated muscle temperatures persist long after exercise cessation.
    • The transfer of residual heat from active musculature may contribute to sustained post-exercise core temperature elevation.