目的：探讨心音图运动试验（PCGET）评估心肌收缩力及心力储备的价值。
Objective: Explore the value of phonocardiogram exercise test (PCGET) to evaluating cardiac contractility.
耐力型运动心脏内分泌改变对于增强心肌收缩性，增强心肌有氧能力，调节机体能量节省化状态和储备力有重要意义。
The endocrine changes of endurance athletic heart have essential significance for the enhancement of myocardial contractility, aerobic endurance, and reserve.
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