不同强度游泳对成年代谢综合征患者安静时心率变异性的影响

目的观察不同强度游泳对成年代谢综合征（MS）患者安静时心率变异性（HRV）的影响。方法选取成年MS患者126例，根据入组先后顺序分为低强度组、中强度组及高强度组，各42例。各组均进行为期4周不同强度的游泳运动，检测并比较运动前后HRV指标。结果①各组LF运动后即刻降低，在恢复期30 min内缓慢上升，高强度组上升的最明显（P <0.05）。低强度组HF运动后即刻上升，中强度组和高强度组运动后即刻降低（ P<0.05）；②各组SDNN 运动后即刻下降，在恢复期30 min 内缓慢上升，但比较差异无统计学意义（P >0.05）。各组RMSSD 运动后即刻上升，在恢复期30 min内缓慢降低（P <0.05）。各组PNN50 运动后即刻下降，在恢复期30 min内中强度组和高强度组缓慢上升，而低强度组持续下降（P <0.05）；③中强度组和高强度组运动后LF、HF、SDNN、RMSSD及PNN50 较运动前升高，LF/HF较运动前降低，且与低强度组比较，差异均有统计学意义（P <0.05 或P<0.01）。结论4 周中强度和高强度的游泳运动可以改善MS 成人患者的HRV，而低强度的游泳运动对HRV 影响不明显。

Influence of swimming exercise at different intensities on heart rate variability of adult with metabolic syndrome in quiet condition

Objective To observe the influence of swimming exercise at different intensities on heart rate variability of adult with metabolic syndrome (MS) in quiet condition. Methods A total of 126 adults with MS were divided into the low intensity exercise group, the moderate intensities of exercise group and the high intensity exercise group. All groups were given different intensities of swimming exercise training for 4 weeks,and the HRV indexes were compared between before and after exercise. Results The LF were reduced on the training instantaneousness, and rose slowly in 30 min of recovery time in the three groups, and the most obviously rising group was the high intensity exercise group (P < 0.05). HF increased in the low intensity exercise group, and reduced in the moderate and high intensity exercise group on the training immediately(P < 0.05). The SNDD reduced on the training immediately, and rose slowly on recovery time of 30 min in the three groups, but there was no statistically significant difference between the groups (P > 0.05). The RMSSD rose on the training immediately in the three groups, and in 30 min of recovery time the RMSSD rose slowly in the three groups. The PNN50 reduced on the training immediately in the three groups, and in 30 min of recovery time, the PNN50 rose slowly in the moderate and high intensity exercise group, and reduced in the low intensity exercise group (P < 0.05). LF, HF, RMSSD and PNN50 rose and LF/HF reduced significantly after exercise in the moderate and high intensity exercise group compared with the low intensity group (P <0.05 orP < 0.01). Conclusions The moderate and high intensity swimming exercise training can improve HRV in adults with MS, but there is no significant effect of low intensity swimming exercise training on HRV.