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Association between the increase in brain temperature and physical performance at different exercise intensities and
A C Kunstetter1, S P Wanner1, L G Madeira1
1Laboratório de Fisiologia do Exercício, Departamento de Educação Física, Escola de Educação Física, Fisioterapia e Terapia Ocupacional, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
Summary
Brain temperature (T brain) impacts physical performance. Higher rates of T brain increase during exercise negatively correlate with performance, but this association depends on the exercise protocol, not just intensity.
Area of Science:
- Exercise Physiology
- Neuroscience
- Sports Science
Background:
- Brain temperature (T brain) is a sensitive indicator of physical performance.
- The relationship between T brain and exercise performance, particularly concerning exercise intensity, remains unclear.
Purpose of the Study:
- To investigate if the association between physical performance and increased T brain during exercise in a temperate environment is dependent on exercise intensity.
- To compare the effects of constant versus incremental exercise protocols on T brain and performance.
Main Methods:
- Adult male Wistar rats performed constant exercise at varying speeds (18, 21, 24 m/min) until fatigue.
- T brain was continuously monitored using a thermistor.
- An incremental-speed exercise protocol was also employed for comparison.
Main Results:
- Exercise induced a speed-dependent increase in T brain, with higher speeds showing a faster rise.
- Performance correlated negatively with the rate of T brain increase during constant exercise.
- T brain at fatigue was lower in incremental exercise compared to constant exercise, with no observed association between T brain increase rate and performance.
Conclusions:
- Performance during constant exercise is negatively influenced by the increase in T brain, especially its rate.
- The impact of T brain on exercise performance is protocol-dependent, differing between constant and incremental exercise intensities.
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