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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
Summary
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).
- 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.