摘要
目的:检测吸气肌训练(IMT)对常氧和低氧条件下运动效果的影响;方法:15名受试者用呼吸肌训练仪进行为期4周的训练,其中,对照组8人,采用15%PImax(最大吸气口腔压力);训练组7人,采用50%PImax。训练前后,在低氧和常氧条件下分别进行85%V.O2max的跑台力竭测试及功能测试;结果:IMT组PImax增加24.5%±3.1%。所有条件下力竭时间均未见改变。IMT组在常氧和低氧运动后呼吸肌疲劳均减少10%(P<0.05);在低氧条件下运动,V.O2减少8%~12%(P<0.05),心输出量减少14%±2%,通气量减少25%±3%;动脉血氧饱和度和肺扩散能力分别增加了4%±1%和22%±3%;结论:IMT可以明显改善低氧条件下运动的呼吸功能。
The purpose of this study was to determine the effects of inspiratory muscle training (IMT) on exercise at hypoxia(H) and normoxia (N). Four-week IMT program was implemented with 15 healthy subjects using an inspiratory muscle training machine set at either 15 % ( C: n = 8 ) or 50 % ( IMT : n = 7 ) maximal inspiratory mouth pressure (Plmax). Two treadmill tests (85 % VO2 max) to exhaustion and measurement of function were completed before and after training in H and N. Significant increasing of 24. 5 % ±3. 1% in Plmax was seen in the IMT group. Time to exhaustion remained unchanged in all conditions. Inspiratory muscle fatigue following exercise was reduced 10% (P〈0.05) in IMT after both normoxia and hypoxia. During hypoxia training, IMT reduced (P〈 0. 05) VO2 by 8% ± 12%, cardiac output by 14 %± 2 %, ventilation by 25% + 3 %, but increased arterial oxygen saturation by 4 % ± 1% and lung diffusing capacity by 22%±3 %. These data suggest that IMT significantly improves functional physiologic measurement at hypoxic exercise.
出处
《体育科学》
CSSCI
北大核心
2007年第3期38-42,共5页
China Sport Science
关键词
呼吸肌
低氧
常氧
训练
respiratory muscles
hypoxia
exercise
inspiratory muscle training