Repeated Warm Water Immersion Induces Similar Cerebrovascular Adaptations to 8 Weeks of Moderate-Intensity Exercise Training in Females

T. G. Bailey; N. T. Cable; G. D. Miller; V. S. Sprung; D. A. Low; H. Jones

doi:10.1055/s-0042-106899

International Journal of Sports Medicine, Inhaltsverzeichnis

Int J Sports Med 2016; 37(10): 757-765
DOI: 10.1055/s-0042-106899

Physiology & Biochemistry

Repeated Warm Water Immersion Induces Similar Cerebrovascular Adaptations to 8 Weeks of Moderate-Intensity Exercise Training in Females

T. G. Bailey

¹School of Health and Sport Science, University of the Sunshine Coast, Maroochydore DC, Australia

²Liverpool John Moores University, Research Institute for Sport and Exercise Sciences, Liverpool, United Kingdom of Great Britain and Northern Ireland

,

N. T. Cable

¹School of Health and Sport Science, University of the Sunshine Coast, Maroochydore DC, Australia

⁴Department of Sports Science, Aspire Academy, Qatar

,

G. D. Miller

¹School of Health and Sport Science, University of the Sunshine Coast, Maroochydore DC, Australia

,

V. S. Sprung

³Department of Obesity and Endocrinology, University of Liverpool, Liverpool, United Kingdom of Great Britain and Northern Ireland

,

D. A. Low

¹School of Health and Sport Science, University of the Sunshine Coast, Maroochydore DC, Australia

,

H. Jones

¹School of Health and Sport Science, University of the Sunshine Coast, Maroochydore DC, Australia

› Institutsangaben

Abstract

Exercise training has the potential to enhance cerebrovascular function. Warm water immersion has recently been shown to enhance vascular function including the cerebrovascular response to heating. We suggest that passive heating can be used alternatively to exercise. Our aim was to compare the effects of exercise with warm-water immersion training on cerebrovascular and thermoregulatory function. 18 females (25±5 y) performed 8 weeks of cycling (70% HR_max) or warm water immersion (42°C) for 30 min 3 times per week. Brachial artery flow-mediated dilation (FMD) and peak cardiorespiratory fitness (VO_2peak) were measured prior to and following both interventions. A passive heat stress was employed to obtain temperature thresholds (T_b) and sensitivities for sweat rate (SR) and cutaneous vasodilation (CVC). Middle cerebral artery velocity (MCAv) was measured throughout. FMD and VO_2peak improved following both interventions (p<0.05). MCAv and cerebrovascular conductance were higher at rest and during passive heating (p<0.001 and <0.001, respectively) following both interventions. SR occurred at a lower T_b following both interventions and SR sensitivity also increased, with a larger increase at the chest (p<0.001) following water immersion. CVC occurred at a lower T_b (p<0.001) following both interventions. Warm water immersion elicits similar cerebrovascular, conduit, and thermoregulatory adaptations compared to a period of moderate-intensity exercise training.

Key words

cerebral blood flow - thermoregulation - exercise training - warm water immersion - vascular function

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