从台阶试验心率变化分析儿童少年心血管机能

Step Tests for Observing Heart Rate Changes in Adolescents

对569名7～17岁学生进行台阶试验,通过试验时心率恢复率变化来横向观察儿童少年心血管机能。结果为:心率恢复越快,心血管机能越好。但体重影响负荷强度,从而影响心率恢复的快慢。因此,同年龄若体重相同,心率恢复越快的机能越好;若心率恢复相同则体重较大的机能较好。结论:1.男生心血管机能随年龄增长而加强。13岁时机能发展较快,17岁达到较高水平。2.女生7～15岁,心血管机能随年龄增长而加强,15岁以后有机能减退的迹象。3.男女(7～15岁)心血管机能相比,7～8岁时水平相似,9～15岁女生机能显著落后于男生。

Step tests were carried out among 569 subjects (age7-17yr) and changesin their heart rates were ana(?)yse(?) for the purpose of examining the cardiovascular function in adolescents.The quicker the HR recovery after exercise. the better the cardiovascular function. But the variable speed of recovery may be related to the exercise intensity which varies with different bodyweights. So the above-mentioned statement hold(?) true only when there is no difference in bodyweight. Otherwise. if there is no difference in the rate of HR recovery, it is those with heavier bodyweights who have better cardiovascular function.Conclusions:1. The cardiovascular function in boys improves with age, building up very fast at 13 and reaching a high level at 17.2. The cardiovascular function in girls improves progressively between the ages of seven and 15, after which signs of weakening begin to appear.3. The girls cardiovascular function is as good as the boys at seven or eight years of age, but is much weaker when they are between nine and 15 years of age.