Iryna Oleksandrivna Yepryntseva, L. S. Shchyrova, V. E. Shekh
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引用次数: 0
摘要
本研究的目的是评估呼吸缓慢和高血压前期(PHT)对心血管和HRV变量以及Valsalva比率(VR)的影响。记录39例血压正常者和35例高血压前期患者5 min静息慢呼吸(6次/min)期心电图,获取HR、LF和HF功率;每期结束时记录收缩压和舒张压。Valsalva动作在休息和慢呼吸阶段后进行。采用双向重复方差分析检验PHT和慢呼吸的影响。采用逐步多元线性回归分析HR、收缩压和舒张压的预测因素。血压正常者和高血压前期患者缓慢呼吸时收缩压降低(分别为117.95±0.73∶115.18±0.91 mm Hg, P = 0.001和130.09±0.08∶125.91±0.96 mm Hg, P < 0.001)。静息时,高血压前期患者的VR较低(1.69±0.05∶1.87±0.05,P = 0.009)。缓慢呼吸后,只有高血压前期患者的VR显著升高(P = 0.008),与正常血压组无显著差异(1.82±0.06∶1.90±0.06,P = 0.346)。LnLF能力,根据我们先前描述的假设解释为交感神经抑制,在两组中都有所增加。在血压正常和高血压前期患者中,缓慢呼吸降低收缩压,这是由于两组患者交感神经抑制增加,而在高血压前期患者中,VR被认为是压力反射活动的替代标志物。
Effect of slow breathing on the blood pressure and the Valsalva ration in prehypertensive Indian students
The purpose of this study was to evaluate the effect of slow breathing and prehypertension (PHT) on cardiovascular and HRV variables and on the Valsalva ratio (VR). ECG was recorded in 39 normotensives and 35 prehypertensives at 5 min resting and slow breathing (6 breaths/min) stages to obtain HR, LF and HF power; SBP and DBP were recorded at the end of each stage. The Valsalva manoeuvre was performed after resting and slow breathing stages. Two-way repeated MANOVA was used to test for the effects of PHT and slow breathing. Stepwise multiple linear regression analysis was used to reveal predictors of HR, SBP and DBP. The normotensives and the prehypertensives demonstrated reduction of SBP during slow breathing (117.95 ± 0.73 vs. 115.18 ± 0.91 mm Hg, P = 0.001 and 130.09 ± 0.08 vs. 125.91 ± 0.96 mm Hg, P < 0.001, respectively). At rest, the VR was lower in prehypertensives (1.69 ± 0.05 vs. 1.87 ± 0.05, P = 0.009). After slow breathing, the VR increased significantly only in prehypertensives (P = 0.008), it was no longer different from that of normotensives (1.82 ± 0.06 vs. 1.90 ± 0.06, P = 0.346). The LnLF power, interpreted according to our hypothesis described previously as sympathoinhibition, increased in both groups. Slow breathing reduced SBP in normotensives and prehypertensives as a result of an increase in sympathoinhibition in both groups and VR, considered as a surrogate marker of the baroreflex activity, in prehypertensives.