筑波大学体育系ヒューマン・ハイ・パフォーマンス先端研究センター

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★西保教授が、長野の国際学会にてシンポジストとして発表しました

西保岳教授(専門:運動生理学)が、11月9-11日、長野で行われた 第6回国際スポーツ医科学ネットワークフォーラム長野2016(The 6th International Sports Science Network Forum in Nagano 2016)にてシンポジストとして発表しました。
このシンポジウムでは、体温上昇時の換気反応について、西保教授のこれまでの成果をまとめたものを発表しました。

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Abstract
CHARACTERISTICS OF HEAT-INDUCED HYPERVENTILATION AT REST AND DURING EXERCISE IN HUMANS
In humans, hyperthermia leads to activation of a set of thermoregulatory responses that includes cutaneous vasodilation and sweating. Hyperthermia also increases ventilation in humans, as is observed in panting animals (e.g. dogs, sheep), but the physiological significance and characteristics of the hyperventilatory response in humans remain unclear. The relative contribution of respiratory heat loss to total heat loss in a hot environment in humans is much small as compared with those of sweating and cutaneous vasodilation, and this hyperventilation usually causes a concomitant reduction in arterial CO2 pressure (hypocapnia), which can cause cerebral hypoperfusion. Consequently, hyperventilation in humans may not contribute to the maintenance of physiological homeostasis (i.e., thermoregulation). To gain some insight into the physiological significance of hyperthermia-induced hyperventilation in humans, in this talk, we discuss 1) the mechanisms underlying hyperthermia-induced hyperventilation, 2) the factors modulating this response, 3) the physiological consequences of the response, and 4) the physiological responses of the voluntary breathing control to suppress the hyperthermia-induced hyperventilation.

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