Brain and Cardiorespiratory Responses to Exercise in Hot and Thermoneutral Conditions

Edwards, Andrew M., Deakin, G. and Guy, J. (2016) Brain and Cardiorespiratory Responses to Exercise in Hot and Thermoneutral Conditions. International Journal of Sports Medicine, 37. pp. 1-6. ISSN 0172-4622

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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. Ten adult male participants performed a standardised incremental exercise test to exhaustion on a cycle ergometer in an environment controlled laboratory on two separate occasions, in a randomised 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 2 peak across Hot (42.5 ml/kg/min) and Neutral (42.8 ml/kg/min) conditions, although ventilatory threshold (VT) occurred at a lower threshold (68%) in Hot, compared with Neutral condition (74%) (p<0.05). EEG alpha and beta wave responses both demonstrated significant increases from baseline to VT (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 Type: Article
Keywords: EEG, heat, ventilatory threshold, incremental exercise
Divisions: ?? UniversityCollegePlymouthMarkJohn ??
Depositing User: Mrs Wendy Evans
Date Deposited: 25 Jul 2016 13:15
Last Modified: 14 Feb 2020 15:29
URI: http://marjon.repository.guildhe.ac.uk/id/eprint/9322

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