Objective To study the effects on heart rate variability cause by low or moderate intensity aerobic exercise for elder . Methods 60 elders were divided into two groups .Two groups were given low or moderate intensity aerobic exercise for12 w.Results After aerobic exercise of 12 w, SDNN, rMSSD, pNN50%and HF were increased relative to the previous exercise (P<0.05).LF, LF/HF had no significant changes .Conclusions Low or moderate intensity aerobic exercise has positive clinical significance to reduce the incidence rate and mortality rate of cardiovascular disease in gerontism .%目的：研究低、中强度有氧运动对老年人心率变异性（ HRV）的影响。方法将60位受试老年均分为两组，分别进行12 w低、中强度有氧运动，检测并比较运动前后的HRV指标。结果12 w有氧运动后，低、中强度有氧运动组 SDNN、rMSSD、pNN50％、HF相对于运动前均升高（ P＜0．05）；LF、LF／HF无显著性改变；但两种不同强度有氧运动对受试者HRV的影响无显著差异。结论低、中强度有氧运动对降低老年人心血管疾病的发病率与死亡率具有积极意义。
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