Activities per year
Multi-stage, ultra-endurance events in hot, humid conditions necessitate a-priori thermal adaptation, often achieved through heat acclimation (HA), to improve performance by reducing thermoregulatory strain and perceptions of heat stress. This study investigated the physiological, perceptual and immunological responses to short-term HA (STHA) in athletes preparing for the Marathon des Sables. Methods Eight ultra-endurance athletes (age; 42±4 yrs, mass; 81.9±15.0 kg and body fat; 17.6±5.9%) completed 4 days of controlled hyperthermia STHA (60 min·day -1, 45°C and 30% relative humidity). Pre, during and post sessions, physiological and perceptual measures were recorded. Immunological measures were recorded pre-post session 1 and 4. Results STHA improved peak thermal comfort (-1,P=0.02), sensation (-1,P=0.03) and perceived exertion (-2,P=0.04). A dissociated relationship between perceptions of fatigue and Tre was evident after STHA, with reductions in perceived physical (-6,P=0.04) and general (-2,P=0.04) fatigue. Exercising Tre and HR did not change (P>0.05), however, sweat rate increased 14% (P=0.02). No changes were found in white blood cell counts or content (P>0.05). Conclusions Four days of STHA facilitates effective perceptual adaptations and lower feelings of fatigue, without compromising immune status prior to an ultra-endurance race in heat stress. A greater and prolonged physiological strain is required to confer optimal physiological adaptations.
|Number of pages||8|
|Journal||Journal of Sports Sciences|
|Publication status||Published - 9 Dec 2016|
Bibliographical noteThis is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Sports Sciences on 09/12/2016, available online: http://www.tandfonline.com/10.1080/02640414.2016.1265142
- Short-term heat acclimation
- heat stress
- perceived fatigue
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- School of Sport and Health Sciences - Associate Dean Academic Operations
- Centre for Stress and Age-Related Disease
- 1 Research degree
Optimising heat acclimation state and refining strategies for the acquisition of heat adaptations (PhD)
Neil Maxwell (Supervisor), Jeanne Dekerle (Supervisor) & Mark Hayes (Supervisor)Feb 2018
Activity: External examination and supervision › Research degree