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Integrative Human Cardiovascular Responses to Hyperthermia

Chiesa, S; Trangmar, S; Watanabe, K; González-Alonso, J; (2019) Integrative Human Cardiovascular Responses to Hyperthermia. In: Periard, J and Racinais, S, (eds.) Heat Stress in Sport and Exercise. (pp. 45-65). Springer: Cham, Switzerland. Green open access

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Abstract

Progressive whole-body hyperthermia with passive heat stress is associated with a host of physiological adjustments. These include large increases in peripheral blood flow and cardiac output and a smaller selective redistribution of blood flow from the cerebral and visceral tissues to the limbs, head, and torso, with perfusion pressure being only slightly reduced. Aerobic metabolism also increases in these conditions, but the magnitude is small in absolute terms, suggesting a predominant role of thermosensitive mechanisms in passive hyperthermia-induced cardiovascular adjustments. Although exercise heat stress requires substantially greater blood flow requirements compared to passive heat stress alone, the magnitude of this hyperemic response is less than would be expected given the extent to which both conditions independently increase blood flow in isolation. As a result, submaximal exercise limb blood flow is only slightly higher during small muscle-mass exercise in the heat, and is similar to control conditions during whole-body exercise. When exercise intensity is increased further towards maximal levels, the superimposition of heat stress leads to earlier reductions in regional and systemic blood perfusion, compromised locomotor limb aerobic metabolism, and ultimately results in impaired endurance capacity. This chapter provides an integrative overview of the human cardiovascular response to passive heat stress and exercise heat stress, with emphasis on its consequences on exercise performance in the heat.

Type: Book chapter
Title: Integrative Human Cardiovascular Responses to Hyperthermia
ISBN-13: 978-3-319-93514-0
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/978-3-319-93515-7_3
Publisher version: https://doi.org/10.1007/978-3-319-93515-7_3
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Physiological strain, blood flow, hydration, hyperthermia, cardiovascular interactions, cardiovascular control
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science > Clinical Science
URI: https://discovery.ucl.ac.uk/id/eprint/10067848
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