Graduate School of Health Sciences, Dokuz Eylül University, Izmir, Turkey.
School of Physical Therapy and Rehabilitation, Dokuz Eylül University, Izmir, Turkey.
Ir J Med Sci. 2021 May;190(2):577-585. doi: 10.1007/s11845-020-02353-w. Epub 2020 Aug 26.
Understanding the acute effects of inspiratory muscle training (IMT) at different intensities on the autonomic nervous system, arterial stiffness, and blood pressure in healthy young people will be important in the constitution of appropriate IMT prescriptions.
To investigate the acute effects of IMT at different intensities on autonomic function, arterial stiffness, and blood pressure in healthy young people METHODS: Thirty-six healthy participants were enrolled in this crossover study. All participants randomly performed IMT sessions, which consisted of diaphragmatic breathing exercise (DBE), 10%, 30%, and 60% of maximal inspiratory pressure (MIP) on consecutive days. Autonomic function and arterial stiffness were assessed by measuring heart rate variability (HRV) and aortic pulse wave velocity (AoPWV), respectively. HRV, AoPWV, and blood pressure were recorded before and immediately after each IMT session.
There was no significant difference in the baseline measurements between IMT sessions (p > 0.05). Heart rate (HR) significantly decreased after DBE and IMT at 10% of MIP (p < 0.05). All time domain parameters of HRV significantly improved after DBE compared with the baseline (p < 0.05). There was no difference in the frequency domain of HRV after the IMT sessions (p > 0.05). AoPWV significantly increased after IMT at 60% of MIP (p < 0.05). Mean arterial pressure significantly changed after DBE and IMT at 60% of MIP (p < 0.05).
A single session of DBE positively affects autonomic function and blood pressure, while IMT at 60% of MIP increases arterial stiffness. The different intensities of IMT have various impacts on autonomic function, arterial stiffness, and blood pressure.
NCT03788356.
了解不同强度的吸气肌训练（IMT）对健康年轻人自主神经系统、动脉僵硬度和血压的急性影响，对于制定适当的 IMT 方案非常重要。
探讨不同强度的 IMT 对健康年轻人自主神经功能、动脉僵硬度和血压的急性影响。
本研究采用交叉设计，共纳入 36 名健康参与者。所有参与者随机进行 IMT 干预，包括膈肌呼吸训练（DBE）和 10%、30%和 60%最大吸气压力（MIP），每天进行一次。通过测量心率变异性（HRV）和主动脉脉搏波速度（AoPWV）评估自主神经功能和动脉僵硬度。在每次 IMT 干预前后记录 HRV、AoPWV 和血压。
IMT 干预前的各项基础测量值在不同干预之间无显著差异（p>0.05）。与基线相比，DBE 和 10%MIP 的 IMT 后心率（HR）显著降低（p<0.05）。与基线相比，DBE 后所有 HRV 时域参数均显著改善（p<0.05）。IMT 干预后 HRV 的频域无差异（p>0.05）。60%MIP 的 IMT 后 AoPWV 显著增加（p<0.05）。DBE 和 60%MIP 的 IMT 后平均动脉压显著改变（p<0.05）。
单次 DBE 可积极影响自主神经功能和血压，而 60%MIP 的 IMT 则增加动脉僵硬度。不同强度的 IMT 对自主神经功能、动脉僵硬度和血压有不同的影响。
NCT03788356。
