Abstract：
Purpose: This study evaluated the effects of exercise training (ET) and inspiratory muscle-loaded exercise training (IMLET) on ventilatory response and intercostal muscle deoxygenation levels during incremental cycling exercise. Methods: Twenty-one male participants were randomly divided into IMLET (n = 10) or ET (n = 11) groups. All participants underwent a 4-week cycling exercise training at 60% peak oxygen uptake. IMLET loaded 50% of maximal inspiratory pressure (PImax). Respiratory muscle strength test, respiratory muscle endurance test (RMET), resting hypoxic ventilatory responsiveness (HVR) test, and incremental cycling test were performed pre- and post-training. Results: The extent of improvement in the PImax was significantly greater in the IMLET group (24%) than in the ET group (8%) (p = .018), and an extended RMET time was observed in the IMLET group (p < .001). Minute ventilation (V˙E) during exercise was unchanged in both groups before and after training, but tidal volume during exercise increased in the IMLET group. The increase in the exercise intensity threshold for muscle deoxygenation was similar in both groups (p < .001). HVR remained unchanged in both groups post-training. The exercise duration for the incremental exercise until reaching fatigue increased by 7.9% after ET and 6.9% after IMLET (p < .001). Conclusion: The 4-week IMLET improved respiratory muscle strength and endurance but did not alter HVR. Respiratory muscle deoxygenation was alleviated by exercise training, with a limited impact of inspiratory load training.
摘要：
目的：本研究评估了运动训练（ET）和吸气肌负荷运动训练（IMLET）对增量循环运动中通气反应和肋间肌脱氧水平的影响。方法：21名男性参与者随机分为IMLET组（n=10）和ET组（n=11）。所有参与者都接受了为期4周的自行车运动训练，峰值摄氧量为60％。IMLET加载最大吸气压力(PImax)的50%。呼吸肌力测试,呼吸肌耐力测试（RMET），静息低氧通气反应性（HVR）测试，和增量循环测试在训练前和训练后进行。结果：IMLET组（24％）的PImax改善程度明显大于ET组（8％）（p=0.018），IMLET组RMET时间延长(p<.001)。训练前后两组在运动过程中的分钟通气量(V•E)没有变化,但IMLET组运动期间潮气量增加。两组肌肉脱氧运动强度阈值的增加相似（p<.001）。训练后两组的HVR保持不变。在ET和IMLET后，增量运动直到达到疲劳的运动持续时间增加了7.9％，在IMLET后增加了6.9％（p<.001）。结论：4周IMLET可改善呼吸肌力量和耐力，但不改变HVR。通过运动训练减轻了呼吸肌的脱氧,吸气负荷训练的影响有限。
