Dressendorfer R H, Wade C E, Bernauer E M
J Appl Physiol Respir Environ Exerc Physiol. 1977 Mar;42(3):444-8. doi: 10.1152/jappl.1977.42.3.444.
Effects of three curvilinear inspiratory resistances (R1, R2, R3) on the cardiorespiratory responses of seven well-trained men during incremental cycling tests to exhaustion were studied by comparison to the low resistance R0 (at 1 l/s, R0 = 0.2; R3 = 6.5 cmH2O-s/l). Submaximal VO2 and the gas exchange anaerobic threshold (AT) were not affected by increasing resistance. Although maximal work rates were not significantly changed, highly significant reductions were observed for VE (R0 = 166.3; R3 = 99.7 l/min BTPS), VO2 max (R0 = 4,26; R3 = 3.74 l/min), HR (R0 = 185; R3 = 176 beats/min), and endurance (R0 = 17.3; R3 = 15.5 min) suggesting that aerobic work tolerance was dependent on ventilatory capacity. In additional tests removal of R3 at exhaustion abruptly increased VE and VO2, and permitted work to continue. Ventilation and work tolerance were therefore limited by R3 before the legs fatigued. Breathing 35% O2 against R3 produced significant, although small, increases in AT, VO2 max, peak HR, and endurance while decreasing the hyperventilatory response to work above AT. Thus, aerobic work tolerance reduced with high inspiratory resistance was partly restored by moderate hyperoxia, apparently because the ventilatory limit was delayed.
通过与低阻力R0（在1升/秒时，R0 = 0.2；R3 = 6.5厘米水柱·秒/升）进行比较，研究了三种曲线吸气阻力（R1、R2、R3）对七名训练有素的男性在递增式自行车测试至疲劳过程中心肺反应的影响。次最大摄氧量（VO2）和气体交换无氧阈（AT）不受阻力增加的影响。尽管最大工作率没有显著变化，但观察到每分钟静息通气量（VE）（R0 = 166.3；R3 = 99.7升/分钟，体温、气压、饱和水蒸气状态）、最大摄氧量（VO2 max）（R0 = 4.26；R3 = 3.74升/分钟）、心率（HR）（R0 = 185；R3 = 176次/分钟）和耐力（R0 = 17.3；R3 = 15.5分钟）有高度显著的降低，这表明有氧工作耐力取决于通气能力。在额外的测试中，疲劳时去除R3会突然增加VE和VO2，并使工作得以继续。因此，在腿部疲劳之前，通气和工作耐力受到R3的限制。在对抗R3的情况下呼吸35%的氧气，尽管增加幅度较小，但会使AT、VO2 max、峰值心率和耐力显著增加，同时减少高于AT时对工作的过度通气反应。因此，高吸气阻力降低的有氧工作耐力部分地通过适度的高氧恢复，显然是因为通气限制被延迟了。
