Heat acclimation attenuates the increased sensations of fatigue reported during acute exercise-heat stress

Willmott, Ashley G. B. and Hayes, Mark and James, Carl A. and Gibson, Oliver R. and Maxwell, Neil S. (2020) Heat acclimation attenuates the increased sensations of fatigue reported during acute exercise-heat stress. Temperature, 7 (2). pp. 178-190. ISSN 2332-8959

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Official URL: http://dx.doi.org/10.1080/23328940.2019.1664370


Athletes exercising in heat stress experience increased perceived fatigue acutely, however it is unknown whether heat acclimation (HA) reduces the magnitude of this perceptual response and whether different HA protocols influence the response. This study investigated sensations of fatigue following; acute exercise-heat stress; short- (5-sessions) and medium-term (10-sessions) HA; and between once- (ODHA) and twice-daily HA (TDHA) protocols. Twenty male participants (peak oxygen uptake: 3.75 ± 0.47 L·min-1) completed 10 sessions (60-min cycling at ~2 W·kg-1, 45°C/20% relative humidity) of ODHA (n = 10) or non-consecutive TDHA (n = 10). Sensations of fatigue (General, Physical, Emotional, Mental, Vigor and Total Fatigue) were assessed using the multi-dimensional fatigue scale inventory-short form pre and post session 1, 5 and 10. Heat adaptation was induced following ODHA and TDHA, with reductions in resting rectal temperature and heart rate, and increased plasma volume and sweat rate (P < 0.05). General, Physical and Total Fatigue increased from pre-to-post for session 1 within both groups (P < 0.05). Increases in General, Physical and Total Fatigue were attenuated in session 5 and 10 vs. session 1 of ODHA (P < 0.05). This change only occurred at session 10 of TDHA (P < 0.05). Whilst comparative heat adaptations followed ODHA and TDHA, perceived fatigue is prolonged within TDHA.

Item Type: Journal Article
Keywords: Heat stress, internal load, fatigue, heat acclimation, heat adaptation
Faculty: Faculty of Health, Education, Medicine & Social Care
SWORD Depositor: Symplectic User
Depositing User: Symplectic User
Date Deposited: 24 Sep 2019 08:29
Last Modified: 09 Sep 2021 18:54
URI: https://arro.anglia.ac.uk/id/eprint/704787

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