Brain and cardiorespiratory responses to exercise in hot and thermoneutral conditions

Edwards, A.M., Deakin, G.B., and Guy, J.H. (2016) Brain and cardiorespiratory responses to exercise in hot and thermoneutral conditions. International Journal of Sports Medicine, 37 (10). pp. 779-784.

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Abstract

The aim of this study was to test whether or not concurrent evaluations of brain (electroencephalography [EEG]) and cardiorespiratory responses to exercise are influenced by environmental conditions. 10 adult male participants performed a standardized incremental exercise test to exhaustion on a cycle ergometer in an environment controlled laboratory on 2 separate occasions, in a randomized order; one in a hot condition (34.5°C) and one in a thermoneutral condition (20°C). EEG, heart rate and expired air were collected throughout. EEG data were decontaminated for artefacts, log-transformed and expressed as aggregated alpha and beta power responses across electrodes reflecting the frontal cortex of the brain. Performance outcomes showed there was no difference in  V˙O₂ peak across hot (42.5 ml/kg/min) and neutral (42.8 ml/kg/min) conditions, although ventilatory threshold (V(T)) occurred at a lower threshold (68%) in hot compared to neutral condition (74%) (p<0.05). EEG alpha and beta wave responses both demonstrated significant increases from baseline to V(T) (p<0.01). EEG beta-band activity was significantly elevated in the heat compared to the neutral condition. In conclusion, elevated EEG beta-band activity in response to incremental exercise in the heat suggests that beta-band activation and cortical awareness increases as exercise becomes increasingly intense.

Item ID: 45850
Item Type: Article (Research - C1)
ISSN: 1439-3964
Keywords: brain; heart rate; electroencephalography; EEG; heat; beta band; ventilatory threshold; incremental exercise
Date Deposited: 30 Jan 2017 03:48
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110602 Exercise Physiology @ 60%
11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110603 Motor Control @ 40%
SEO Codes: 92 HEALTH > 9299 Other Health > 929999 Health not elsewhere classified @ 100%
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