Objective To investigate the effects of diaphragmatic respiration on the heart rate variation ( HRV ) during the mental arithmetic. Methods The frequency - domains of the HRV of the 21 normal people were collected by the short - range measurement during the baseline phrase, the mental arithmetic phrase and the diaphragmatic respiration phrase for analysis. Results The LF, LF/HF and LF were significantly higher in mental arithmetic phrase than those at baseline, while the HF% was significantly lower ( P <0. 05 ). Meanwhile, significantly elevated LF/HF, LF% and LFPK with reduced HF% were revealed in the diaphragmatic respiration phrase, when comparing with those in the mental arithmetic phrase. Conclusion Enhanced sympathetic activation and restrained parasympathetic activation are observed in normal people. A tend to the optimal peak of LFPK is induced with diaphragmatic respiration.%目的 观察正常人群在心算任务下心率变异性的变化及腹式呼吸对心率变异的调节作用.方法 选择正常健康被试者21名采用短程测量法分别采集静息期、心算刺激下及腹式呼吸中心率变异的频域指标,并进行前后对照.结果 被试者心算刺激下与静息时的心率变异频域指标比较LF(z=-1.93,P<0.01)、LF/HF(t=2.38,P<0.05)、LF%(t=3.43,P<0.01)均上升,HF%则明显下降(t=3.25,P<0.01).被试者腹式呼吸与心算刺激的比较中,心率变异频域指标LF/HF(z=- 2.24,P<0.05)、LF%(t=3.47,P<0.01) 、LFPK(t=2.37,P<0.05)显著增高,HF%显著降低(t= -2.23,P<0.05).结论 正常人群在心理应激中表现出交感神经的活动增强,副交感神经抑制,腹式呼吸能调节自主神经低频峰值趋于向理想的峰值靠近.
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