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背景:人们在运动过程中会有强烈疲劳感,有时通过下意识呐喊重新调整状态、保持运动性能。本研究通过分析心肺反应和积分肌电变化探究呐喊在功率自行车高强度运动中的影响。方法:23名中等训练水平的受试者参加测试。以25 W/min的阻力开始功率自行车运动,阻力逐渐增加。要求参与者在运动试验期感到疲惫时呐喊至少3次;在对照试验期,不能做出任何呐喊。测试顺序采用随机原则,两次测试间隔3-10天。用双因素重复测量方差分析(ANOVA)检验两次测试内部及相互间的差异,以及测试与时间的交互作用。结果:峰值功率与力竭时间在呐喊测试中较对照测试显著更高、更长。但两次试验中峰值功率的股外侧肌肌电图数值并无明显差异。在90%-100%最大强度运动时,呐喊过程中的耗氧量、二氧化碳排出量、氧脉搏、通气量及呼吸率均有明显的时间—测试交互作用。这些指标在不同测试间均有显著差异(p<0.02),但心率、呼吸交换比率、呼气末氧气压力及氧气通气当量仅在不同测试有显著差异,没有时间—测试交互作用。结论:在高强度运动中呐喊能提升氧脉冲和耗氧量峰值,维持二氧化碳排放效率,还能在不要求有较强的肌电图信号时维持肌肉活动。
Background: People have a strong sense of fatigue during exercise, sometimes through subconscious cry to readjust their status and maintain their performance. This study explores the impact of crying on the high-intensity exercise of power bicycles by analyzing the cardiopulmonary response and the integral myoelectric changes. Methods: Twenty-three moderately-trained subjects participated in the test. Starting at 25 W / min of power cycling resistance, resistance gradually increased. Ask participants to cry for at least 3 times when they feel tired during the exercise test period; no cries can be made during the control trial period. The test sequence adopts the random principle, and the interval between two tests is 3-10 days. Two-way repeated measures analysis of variance (ANOVA) was used to test the differences between the two tests within and between tests and the time-to-test interaction. Results: The peak power and exhaust time were significantly higher and longer in the shout test than the control test. However, there was no significant difference in the EMG values of the lateral femoral muscle at peak power between the two experiments. At 90% -100% maximum intensity exercise, there was a significant time-test interaction between oxygen consumption, carbon dioxide emissions, oxygen pulse, ventilation and respiratory rate during crying. These indices differed significantly between tests (p <0.02), but heart rate, respiratory exchange rate, end-expiratory oxygen pressure, and oxygen ventilation equivalence were significantly different only in different tests with no time-to-test interaction. CONCLUSIONS: Screaming during high-intensity exercise increases the peak of oxygen pulse and oxygen consumption, maintains the efficiency of carbon dioxide emissions, and maintains muscle activity without requiring strong EMG signals.