Effects Of Respiartory Muscle Training On Exercise Responses In Hypdxia

Objective: Hypoxic training is used to improve athletic ability. But if people can’tadapt the low-oxygen conditions, this method will can’t be effective. The purpose ofthis study is to summarize the effect of the respiratory muscles training applied inhypoxic training through comparing the athletic ability, breath function, and fatiguelevel in the hypoxic environment before and after the respiratory muscles training.Method: This study made respiratory muscles training as the interference factors tomonitor subjects’ physical function and the fatigue level of the respiratory musclestraining in the increasing load cycle test under the low-oxygen conditions. And findthe application characters of the respiratory muscles training in the hypoxic training.The way of monitor is physiolygy and biochemistry method, Rating of PerceivedExertion （RPE） and Surface Electromyography （sEMG）.Results and Conclusion:1. Four-week respiratory training contributes to improve the level of cardiopylmonaryand endurance in the hypoxic training.1.1The peak oxygen consumption（VO₂peak） in male and female test groups wereincreased6.0%and23.0%respectively, when compared to the control groups afterfour-week respiratory training.1.2The maximum power output（LOADmax） of the male and female test groups weresignificantly increased4.5%and3.1%, when compared the control groups, with nosignificantly different.1.3The fatigue time （Tmax） of cycle tests in male and female test groups wassignificant longer（P<0.05; P<0.01）, when compared to the control group afterfour-week respiratory training.1.4The maximum heart rate （HRmax） of the test group declined during the cycle test,but were not significantly different.2. It was clearly positive correlation between the power of the lactate threshold andthe intensity of the respiratory muscles training （the Pearson correlation is0.811,P<0.01）, which shows it is important to increase the intensity of the respiratorymuscles training properly for the improvement of the endurance.3. The test group’s ventilation （VE） was increased and the respiration rate （RR） wasdecreased significantly（P<0.05）, which shows four-week respiratory muscles trainingis effective to improve the breath adaption in low-oxygen condition.4. In this study, as the typical quota of athletic ability and respiratory adaption ability, VO₂peak,AT,VCO₂,RR,VE,RPE can predict the effect of the respiratorymuscles training.5. The slope of median frequency （MF） and mean power frequency （MPF） ofsternocleidomastoideus were increased significantly （P<0.05） in test group, whencompared to the control group after four-week respiratory training. The signal of thesurface electromyography in diaphragm and obliquus externus abdominis was notobvious.That shows it was effective to relieve tiredness of thesternocleidomastoideus after four-week respiratory muscles training.