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目的:探讨12周运动心脏康复活动后心梗患者(PMIP)心率(HR)、摄氧量(VO2)、主观用力感觉(RPE)的相关关系,据此为其以后的康复活动提供强度控制和自身有氧工作能力评定的合理方法和依据。方法:36名PMIP(其中服用β-阻断剂者(blockade)17名,未服用β-阻断剂者(non-blockade)19名)在活动跑台上进行递增负荷运动实验,测定其HR、VO2、RPE。建立HR/VO2/RPE的相关关系,并对实施12周运动心脏康复活动前后的这些关系进行对比分析。结果:(1)康复活动前HR/VO2及RPE/VO2相关关系的数据分布较集中,康复活动后其数据有沿回归线向两端扩展的趋势。(2)康复活动后HR/%VO2pk及RPR/%VO2pk关系的回归线平行下移(P<0.05)。(3)康复活动后RPE/HR回归线的斜率增大(P<0.05)。结论:康复活动后PMIP的机能能力有所提高,运动可达到较高的强度,而低强度运动时PMIP只表现较小的心肺机能反应。建议在不同心脏康复期,采用不同方程预测PMIP的%VO2pk。
Objective: To investigate the relationship between heart rate (HR), oxygen uptake (VO2) and subjective feeling of force (RPE) in myocardial infarction patients (PMIP) after 12 weeks of exercise heart rehabilitation activities, Reasonable methods and basis for assessing their own aerobic work ability. METHODS: Thirty-six PMIPs (17 with blockade and 19 without non-blockade) were subjected to progressive load-bearing exercise on a treadmill and their HR , VO2, RPE. The relationship between HR / VO2 / RPE was established and compared before and after 12 weeks’ exercise of cardiac rehabilitation. Results: (1) The data distribution of HR / VO2 and RPE / VO2 before rehabilitation activities were more concentrated. After rehabilitation activities, the data tended to expand along the regression line. (2) The regression line of HR /% VO2pk and RPR /% VO2pk after rehabilitation activity was shifted downwards in parallel (P <0.05). (3) The slope of RPE / HR regression line increased after rehabilitation (P <0.05). CONCLUSION: The functional ability of PMIP is improved after rehabilitation, exercise can achieve higher intensity, and PMIP shows less cardiorespiratory response during low-intensity exercise. It is recommended that different equations be used to predict% VO2pk of PMIP during different cardiac rehabilitation periods.