>Objectives: To examine whether long-term practice of yogic breathing alters cardiac autonomic control.>Design: Age–sex matched, cross-sectional, physiologic pilot study.>Settings/Location: Spaulding Rehabilitation Hospital, Cardiovascular Laboratory, Cambridge, MA.>Participants: Twenty-six (26) long-term yoga practitioners and 26 age- and sex-matched controls, free of cardiovascular disease.>Outcome: Cardiac vagal outflow as assessed by respiratory sinus arrhythmia (RSA).>Results: During unpaced (spontaneous) breathing, yoga practitioners exhibited augmented RSA compared to controls (yoga 364.8 ± 75.3 vs. 194.7 ± 46.0 ms2Hz−1, p = 0.03). However, during paced breathing at 0.25 Hz (15 breaths/min), which accounts for inter- and intravariability in breath rate, RSA did not differ between groups (yoga 224.8 ± 48.4 vs. 271.3 ± 59.7 ms2Hz−1, p = 0.98). Furthermore, the relationship between age and RSA, such that RSA declines with age, did not qualitatively differ between groups.>Conclusions: Long-term practice of yogic slow breathing does not appear to augment cardiac vagal control nor prevent known age-related declines.
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机译：>目的：研究长期的瑜伽呼吸练习是否会改变心脏的自主神经控制。>设计：年龄性别匹配的横断面生理性初步研究。>设置/位置：马萨诸塞州剑桥市心血管实验室Spaulding康复医院。>参与者：二十六（26）位长期瑜伽从业者和26位年龄和性别匹配的对照者，没有>结果：通过呼吸窦性心律不齐（RSA）评估的心脏迷走神经流出。瑜伽364.8±75.3和194.7±66.0 ms 2 Hz -1 ，p = 0.03）。然而，在以0.25 Hz（15次/分钟）的节奏呼吸时，这解释了呼吸速率的内部和内部变异性，两组之间的RSA并无差异（瑜伽224.8±±48.4 vs. 271.3±59.7μms 2 Hz -1 ，p = 0.98）。此外，年龄与RSA之间的关系（如RSA随着年龄的增长而下降）在各组之间没有质的差异。已知的与年龄有关的下降。
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