We tested the hypothesis that inspiratory resistive loading (IRL) increases vagal-mediated complexity of heart rate variability (HRV) in older women. We recorded heart rate continually during 30 breaths with Sham or IRL (30 % of maximal inspiratory pressure) in sitting position. The normalized spectral power in the low (LFn) and high (HFn) frequency bands and the symbolic dynamics measures for 0 V, 2UV and 2 L V were obtained. HFn was higher and LFn was lower during IRL than Sham (p < 0.05). During IRL, 2UV component increased more than Sham (p < 0.05) while 0 V index remained unchanged (p> 0.05). In conclusion, acute IRL improved vagal modulation index of both linear (spectral analysis) and non-linear analysis (symbolic dynamics) in older women.

我们测试了以下假设：吸气阻力负荷 (IRL) 会增加老年女性的迷走神经介导的心率变异性 (HRV) 复杂性。我们在坐姿下使用假手术或 IRL（最大吸气压力的 30%）连续记录 30 次呼吸期间的心率。获得了低 (LFn) 和高 (HFn) 频段的归一化频谱功率以及 0 V、2UV 和 2 LV 的符号动态测量值。与假手术相比，IRL 期间 HFn 更高，LFn 更低（p < 0.05）。在 IRL 期间，2UV 分量比 Sham 增加更多（p < 0.05），而 0 V 指数保持不变（p> 0.05）。总之，急性 IRL 改善了老年女性的线性（光谱分析）和非线性分析（符号动力学）的迷走神经调制指数。