Breathing-valve encumbrance and arterial blood gas and acid-base status in exercise in man.
Breathing-valve encumbrance and arterial blood gas and acid-base status in exercise in man.
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男性运动时的呼吸阀阻碍和动脉血气及酸碱状态。
DOI：
10.1007/bf00643513
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Whipp,BJ
中科院分区：
文献类型：
--
作者：
Ward,SA;Wasserman,K;Davis,JA;Whipp,BJ
It has been suggested that the mouthpiece-breathing valve assemblies commonly used in laboratory investigations of ventilatory control may influence regulation of arterial blood gas and acid-base status during exercise. To examine this hypothesis, 10 healthy males each underwent two incremental cycle-ergometer tests (15 W min−1) to the limit of tolerance: one was conducted free of breathing apparatus; the other utilized a mouthpiece (with noseclip) connected to a low-resistance turbine volume sensor. The order was randomly assigned and tests were separated by a 2 h recovery. Blood sampled from an indwelling brachial artery catheter at rest and every 30 W during exercise was analyzed for,, pH and HCO3−. Maximum power was not different between the two tests. Furthermore, no systematic effect of the assembly could be discerned on,or pHa over the entire range of power. We therefore conclude that although ventilation and its pattern may be affected by laboratory breathing apparatus, such encumbrance (if of low resistance and dead space) does not influence blood gas and acid-base regulation during exercise.
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