剣状突起位および頚部位浸水時の最大換気量

概要

論文の詳細を見る
Head-out water immersion might induce a decrease in maximal respiratory functions during exercise. The purpose of this study was to determine the relationship between the level of immersion and the maximal respiratory functions during hyperventilation which was assumed to be a ventilatory model during exercise. Pulmonary functions and maximal voluntary ventilation (MVV) were measured in five male volunteers during standing on land (STL), and during immersion to the xiphoid (WIX) and to the neck (WIN). Compared with STL, there were significant decreases in all pulmonary functions except for FEV_<1.O>, during WIX. Furthermore, during WIN, FVC, FEV_<1.O>, and V_<25> were significantly lower than STL. MVV and tidal volume (TV_<-MVV>) were significantly decreased, whereas respiratoty rate (RR_<-MVV>) tended to increase during immersion. It was suggested that the decrease in expiratory functions indicated by the decrease in FVC, FDV_<1.O>, and V_<25> might cause a decrease in MVV during immersion. On the other hand, the hyperventilation maneuver that was applied in the present study might have produced a decrease in the ventilatory efficiency during immersion, since an increase in RR_<-MVV> during hyperventilation accompanied by a decrease in TV_<-MVV> might elicit a lower alveolar ventilation possibly due to an increase in dead space ventilation.
日本運動生理学会の論文
1997-08-30