Effects of pedal rate on respiratory responses to incremental bicycle work.
Effects of pedal rate on respiratory responses to incremental bicycle work.
复制标题
踏板频率对增量自行车工作呼吸反应的影响。
DOI：
10.1113/jphysiol.1988.sp016968
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
N. Takano
中科院分区：
文献类型：
--
作者：
N. Takano
1. 研究了12名未经训练的女性受试者在30rpm和60rpm的自行车上进行15w /min的增量运动，并在有氧运动速率范围内进行比较，以避免发生乳酸酸中毒的额外影响。2. 在每个踏板速度下，随着负荷的增加，CO2排泄（VCO2）逐渐增加到1.2 1/min的水平。随着VCO2的增加，分气量（VE）、呼吸频率(f)、潮气量（VT）和潮末PCO2逐渐增加。吸气（TI）和呼气（TE）持续时间在从静止循环到无负荷循环的过渡过程中急剧减少；进一步的减少发生在增量加载循环期间。3. 与30转/分相比，在任何给定的VCO2水平下，60转/分的循环运动导致VE的增加更大，潮末二氧化碳分压水平更低。更大的通气反应主要是由于f的增加，而f的增加又由于TE的减少。在骑行过程中，TI的下降几乎不受踏板速率变化的影响。4. 两种蹬速条件下不同程度的通气和PCO2反应表明，中枢和/或外周神经源性刺激参与了非稳态阶段运动性呼吸急促的控制。讨论了骑车运动时呼吸反应受蹬速改变方式影响的可能性。
1. The influence of pedal rate on ventilatory response and breathing pattern during cycle exercise was studied in twelve untrained female subjects performing 15 W/min incremental work on a bicycle at 30 and 60 r.p.m. Comparisons were made within the range of aerobic work rate to avoid additional influences of a developing lactic acidosis. 2. At each pedal rate, CO2 excretion (VCO2) increased progressively to a level of 1.2 1/min with incrementally loaded cycling. With increasing VCO2, minute ventilation (VE), respiratory frequency (f), tidal volume (VT) and end‐tidal PCO2 progressively increased. The inspiratory (TI) and expiratory (TE) durations decreased sharply on the transition from rest to unloaded cycling; further decreases occurred during incrementally loaded cycling. 3. Compared to 30 r.p.m., cycle exercise at 60 r.p.m. resulted in greater increases in VE and lower levels of end‐tidal PCO2 at any given levels of VCO2. The greater ventilatory responses were due mostly to greater increases in f, which were in turn due to greater decreases in TE. The decrease in TI during cycling was little affected by changes in pedal rate. 4. The different magnitudes of ventilatory and PCO2 responses under the two pedal rate conditions suggest that neurogenic stimuli, central and/or peripheral in origin, participate in the control of exercise hyperpnoea in the non‐steady‐state phase. The possibility that the ventilatory response to cycle exercise is affected by the way that pedal rate is changed is discussed.
影响因子：
4.1
作者：
Dombovy,ML;Bonekat,HW;Williams,TJ;Staats,BA
通讯作者：
Staats,BA