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台阶试验是一种经典的定量负荷试验,从20世纪40年代由美国哈佛大学学者首次设计的台阶试验到随后各国根据本国国民情况和测试对象特征进行的各种改良台阶试验方法,都被认为是评价心血管系统功能水平的有效方法[1-3]。大量的研究显示,采用台阶试验评定心功能水平的准确性有待提高[4-7],主要原因是台阶指数无法区分不同性别、不同运动水平测试者心率变化与心功能水平之间的差异[8-9]。本研究
Step test is a classic quantitative load test, from the 1940s by the United States Harvard scholars first designed bench test to the subsequent countries in accordance with national conditions and the characteristics of the test object to a variety of improved step test method, are considered to be Evaluation of cardiovascular system function of the effective method [1-3]. Numerous studies have shown that the accuracy of bench testing in assessing cardiac function needs to be improved [4-7], mainly because the step index can not distinguish between heart rate changes and cardiac function in subjects of different genders and different exercise levels [8 -9]. this research