EXPIRATORY MUSCLE TRAINING AND SENSATION OF RESPIRATORY EFFORT DURING EXERCISE IN NORMAL SUBJECTS
EXPIRATORY MUSCLE TRAINING AND SENSATION OF RESPIRATORY EFFORT DURING EXERCISE IN NORMAL SUBJECTS
复制标题
DOI：
10.1136/thx.50.4.366
复制
发表时间：
1995-04-01
期刊：
影响因子：
10
通讯作者：
OKUBO, T
中科院分区：
文献类型：
--
作者：
SUZUKI, S;SATO, M;OKUBO, T
背景：在呼气负荷过程中，当呼气肌疲劳时，呼吸力竭感可能增加。一项研究进行了确定是否呼气肌训练（EMT）影响呼吸努力的感觉在运动中的健康受试者。方法：6名受试者使用压力阈值装置进行EMT，每天两次，每次15分钟，持续四周；另外6名受试者做针线活作为对照组。呼气阈值设定为个体最大呼气口压（PEmax）的30%。在渐进式运动试验中使用博格量表评估呼吸力量感。结果- EMT后，训练组的PEmax增加了25%。EMT前后Borg评分随运动等级的升高而升高，但EMT后各等级评分均较低。EMT后运动时的分钟通气量减少，运动时的呼吸频率也减少，而呼气时间增加。虽然EMT前后Borg评分与分钟通气的关系无差异，但EMT后的曲线移至较低的Borg评分。在四周的研究期后，对照组的PEmax、Borg评分、分钟通气量或呼吸方式均无变化。结论：这些发现表明，EMT增加了运动期间的呼气肌力量，并减少了呼吸努力的感觉，可能是通过减少分钟换气。
Background-The sensation of respiratory effort may increase as expiratory muscles become fatigued during expiratory loading. A study was performed to determine whether expiratory muscle training (EMT) affects the sensation of respiratory effort during exercise in healthy subjects.Methods - Six subjects performed EMT for 15 minutes twice daily for four weeks using a pressure threshold device; another six subjects sewed as a control group. The expiratory threshold was set at 30% of the individual's maximum expiratory mouth pressure (PEmax). The sensation of respiratory effort was evaluated during a progressive exercise test using the Borg scale.Results - After EMT PEmax increased by 25% in the training group. The Borg score increased as exercise grade increased before and after EMT, but scores for each grade were lower after EMT. Minute ventilation during exercise decreased after EMT, as did the breathing frequency during exercise, while the expiratory time increased. Although there was no difference in the relationship between Borg score and minute ventilation before or after EMT, the curve shifted to a lower Borg score after EMT. There were no changes in PEmax, Borg score, minute ventilation, or breathing pattern after the four week study period in the control group.Conclusion - These findings suggest that EMT increases expiratory muscle strength and reduces the sensation of respiratory effort during exercise, presumably by reducing minute ventilation.