具有较好的改善心肌供血，提高心脏储备能力、改善心功能的功效。
It could prove blood supply of the cardiac muscle, raise reserve capability of the heart.
结论高原低氧环境下心脏储备主要是心肌收缩能力储备而不是心率储备。
Conclusion the cardiac reserve at high altitude is mainly cardiac contractility reserve rather than heart rate reserve.
第一心音的幅值是心脏收缩能力的标准度量，心音图(PCG)可以用于心力储备的研究。
The amplitude of first heart sound is a normal measurement of cardiac contractility, and phonocardiogram (PCG) can be used in the study of cardiac contractility reserve.
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