Eur J Appl Physiol (1992) 65:215-220
,.,r.,'ur'"A o, p p l i e d Physiology and Occupational Physiology © Springer-Verlag1992
Effect of heat stress on muscle blood flow during dynamic handgrip exercise Juhani Smolander and Veikko Louhevaara Department of Physiology, Institute of Occupational Health, Laajaniityntie 1, SF-01620 Vantaa, Finland Accepted March 26, 1992
Summary. During exercise in a hot environment, blood
flow in the exercising muscles may be reduced in favour of the cutaneous circulation. The aim of our study was to examine whether an acute heat exposure (65-70 ° C) in sauna conditions reduces the blood flow in forearm muscles during handgrip exercise in comparison to tests at thermoneutrality (25 ° C). Nine healthy men performed dynamic handgrip exercise of the right hand by rhythmically squeezing a water-filled rubber tube at 13% (light), and at 34O/o (moderate) of maximal voluntary contraction. The left arm served as a control. The muscle blood flow was estimated as the difference in plethysmographic blood flow between the exercising and the control forearm. Skin blood flow was estimated by laser Doppler flowmetry in both forearms. Oesophageal temperature averaged 36.92 (SEM 0.08) °C at thermoneutrality, and 37.74 (SEM 0.07) °C (P
,.,r.,'ur'"A o, p p l i e d Physiology and Occupational Physiology © Springer-Verlag1992
Effect of heat stress on muscle blood flow during dynamic handgrip exercise Juhani Smolander and Veikko Louhevaara Department of Physiology, Institute of Occupational Health, Laajaniityntie 1, SF-01620 Vantaa, Finland Accepted March 26, 1992
Summary. During exercise in a hot environment, blood
flow in the exercising muscles may be reduced in favour of the cutaneous circulation. The aim of our study was to examine whether an acute heat exposure (65-70 ° C) in sauna conditions reduces the blood flow in forearm muscles during handgrip exercise in comparison to tests at thermoneutrality (25 ° C). Nine healthy men performed dynamic handgrip exercise of the right hand by rhythmically squeezing a water-filled rubber tube at 13% (light), and at 34O/o (moderate) of maximal voluntary contraction. The left arm served as a control. The muscle blood flow was estimated as the difference in plethysmographic blood flow between the exercising and the control forearm. Skin blood flow was estimated by laser Doppler flowmetry in both forearms. Oesophageal temperature averaged 36.92 (SEM 0.08) °C at thermoneutrality, and 37.74 (SEM 0.07) °C (P
