Prioux J, Ramonatxo M, Prefaut C
Service d'Exploration de la Fonction Respiratoire, Hôpital Arnaud de Villeneuve, Montpellier, France.
Int J Sports Med. 1997 Aug;18(6):401-7. doi: 10.1055/s-2007-972669.
We compared the effects of two step durations on breathing pattern, mouth occlusion pressure and "effective" impedance of the respiratory system during incremental exercise. Nine normal subjects (mean age: 27.8+/-1.21 years) performed two incremental exercise tests in randomized order: one test with step increments every 1 min 30s and the other, every 4 min. After a warm-up at 25 W for the 1 min 30 s test, the power was increased by 50 W from 50 W to exhaustion. During the last minute at each power, we measured ventilation (VE), tidal volume (VT), breathing frequency (fR), inspiratory and expiratory time (TI and TE), total time of the respiratory cycle (TTOT), TI/TTOT, mean inspiratory flow (VT/TI), mouth occlusion pressure (P0.1), "effective" impedance of the respiratory system (P0.1/(VT/ TI)) and venous blood lactate concentration ([La]). Our result showed that at maximal exercise the power was significantly higher (p < 0.01) and [La] lower (p < 0.01) in the 1 min 30 s test. At 100, 150 and 200 W, the 4 min test showed significantly higher oxygen uptake (VO2), carbon dioxide output (VCO2), VE, P0.1, fR, VT/TI and HR (p <0.001) and significantly lower TI, TE and TTOT (p<0.01). [La] was significantly higher at 150 W (p<0.05) and 200 W (p<0.001). At the same VCO2, P0.1 was not significantly different between the two tests, whereas VE showed a tendency to be higher (p = 0.08) and P0.1/(VT/TI) was significantly lower during the 4 min test. In conclusion, this study allowed us to quantify the difference in inspiratory neuromuscular output and ventilatory response between 1 min 30s and 4 min tests and showed that different step durations alter the relationship between inspiratory neuromuscular output and mean inspiratory flow.
我们比较了两种步长时间对递增运动期间呼吸模式、口腔闭塞压力和呼吸系统“有效”阻抗的影响。九名正常受试者（平均年龄：27.8±1.21岁）按随机顺序进行了两次递增运动测试：一次测试每1分30秒进行一次步长递增，另一次每4分钟进行一次。在1分30秒测试中以25瓦进行热身之后，功率从50瓦开始每次增加50瓦直至力竭。在每个功率的最后一分钟，我们测量了通气量（VE）、潮气量（VT）、呼吸频率（fR）、吸气和呼气时间（TI和TE）、呼吸周期总时间（TTOT）、TI/TTOT、平均吸气流量（VT/TI）、口腔闭塞压力（P0.1）、呼吸系统“有效”阻抗（P0.1/(VT/TI)）和静脉血乳酸浓度（[La]）。我们的结果显示，在最大运动时，1分30秒测试中的功率显著更高（p<0.01），而[La]更低（p<0.01）。在100、150和200瓦时，4分钟测试显示氧摄取量（VO2）、二氧化碳排出量（VCO2）、VE、P0.1、fR、VT/TI和心率（HR）显著更高（p<0.001），而TI、TE和TTOT显著更低（p<0.01）。在150瓦（p<0.05）和200瓦（p<0.001）时，[La]显著更高。在相同的VCO2时，两次测试之间P0.1无显著差异，而VE有更高的趋势（p = 0.08），并且在4分钟测试期间P0.1/(VT/TI)显著更低。总之，本研究使我们能够量化1分30秒和4分钟测试之间吸气神经肌肉输出和通气反应的差异，并表明不同的步长时间会改变吸气神经肌肉输出与平均吸气流量之间的关系。
