出版社：Japan Society of Physical Education, Health and Sport Sciences
摘要：The collection of the expired air is one of the most fundamental procedures used for studying the respiratory function of human subjects. For this reason, many investigators have used Douglas bags and respiratory masks (half mask) with "J" valve or mouthpieces. However, the authors had found several times that some well-trained and excellent athletes often complained and expressed distress or unconfortableness which seemed to be caused by the insufficient air ventilation through tubes and valves in the mask. It seems to suggest that the airway valves in the experimental mask disturb natural respiratory movement. In order to determine or evaluate human pulmonary-respiratory capacity, it would be necessary to employ the airway valves which are large enough to allow natural breathing movement. Therefore, for this reason the authors devised several masks each of which had different inner diameters of airway valves (strictly speaking, it means the inner diameter of tube of valve.) and tried to examine the effects of them, as well as the sizes of connective tubes used, on the pulmonary ventilation in terms of oxygen uptake of human subjects running until exhausted on a treadmill.
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