Heart Rate Variability: An Indicator of AutonomicFunction and Physiological Coherence
Heart rate variability is a measure of the beat-to-beat changes in heart rate. Systems-oriented models propose that HRV is an important indicator of both physiological resiliency and behavioral flexibility,reflecting the individual"s capacity to adapt effectively to stress andenvironmental demands. It has become apparent that while a large degree of instability is detrimental to efficient physiological functioning, too little variation can also be pathological. An optimal level of variability within an organism"s key regulatory systems is critical to the inherent flexibility and adaptability that epitomize healthy function. The normal variability in heart rate is due to the synergistic action of the two branches of the ANS, which actin balance through neural, mechanical，humoral and other physiological mechanisms to maintain cardiovascular parameters in their optimal ranges and to permit appropriate reactions to changing external or internal conditions.
心率变异性HRV 是指每个心跳间期的心率变化，是反映生理弹性和行为弹性的重要指标，能反映个人有效应对压力、适应环境的能力。显然，心率如果太不稳定，就不利于生理功能的正常发挥，但如果变化太小，也可能是病理反映。机体主要调节系统的变化幅度只有处于最佳状态，才能以健康的方式发挥其功能，具备内在的弹性与适应性。心率的正常变化取决于自主神经系统两个分支系统的相互作用，这两个分支系统通过神经、机械、体液和其他的生理机制平衡地发挥作用，使得心血管的各项参数都处于最佳范围内，心脏由此才能根据内外界条件的改变做出适当的反应。
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