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Modulation of the thermoregulatory sweating response to mild hyperthermia during activation of the muscle metaboreflex in humans
Author(s) -
Kondo Narihiko,
Tominaga Hirotaka,
Shibasaki Manabu,
Aoki Ken,
Koga Shunsaku,
Nishiyasu Takeshi
Publication year - 1999
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1111/j.1469-7793.1999.591ac.x
Subject(s) - isometric exercise , medicine , forearm , thermoregulation , cardiology , hyperthermia , occlusion , circulatory system , blood pressure , skin temperature , anesthesia , surgery , biomedical engineering
1 To investigate the effect of the muscle metaboreflex on the thermoregulatory sweating response in humans, eight healthy male subjects performed sustained isometric handgrip exercise in an environmental chamber (35 °C and 50% relative humidity) at 30 or 45% maximal voluntary contraction (MVC), at the end of which the blood circulation to the forearm was occluded for 120 s. The environmental conditions were such as to produce sweating by increase in skin temperature without a marked change in oesophageal temperature. 2 During circulatory occlusion after handgrip exercise at 30% MVC for 120 s or at 45% MVC for 60 s, the sweating rate (SR) on the chest and forearm (hairy regions), and the mean arterial blood pressure were significantly above baseline values ( P < 0.05 ). There were no changes from baseline values in the oesophageal temperature, mean skin temperature, or SR on the palm (hairless regions). 3 During the occlusion after handgrip exercise at 30% MVC for 60 s and during the occlusion alone, none of the measured parameters differed from baseline values. 4 It is concluded that, under mildly hyperthermic conditions, the thermoregulatory sweating response on the hairy regions is modulated by afferent signals from muscle metaboreceptors.