Yamashina Yoshihiro, Yokoyama Hisayo, Naghavi Nooshin, Hirasawa Yoshikazu, Takeda Ryosuke, Ota Akemi, Imai Daiki, Miyagawa Toshiaki, Okazaki Kazunobu
Environmental Physiology for Exercise, Osaka City University Graduate School of Medicine, Japan.
J Phys Ther Sci. 2016 Jan;28(2):412-8. doi: 10.1589/jpts.28.412. Epub 2016 Feb 29.
[Purpose] The purpose of the present study was to evaluate the effect of water immersion at different water depths on respiratory function and the effect of inspiratory load breathing (ILB) during water immersion at different water depths on respiratory muscle strength evaluated by maximum inspiratory and expiratory pressures (PImax and PEmax, respectively). [Subjects] Eight healthy men participated randomly in three trials. [Methods] All sessions were conducted with the participants in a sitting position immersed in a water bath. We evaluated respiratory function, PImax and PEmax during submersion at three different levels of water depth (umbilicus; 4th-rib; or clavicle, CL) and after subsequent 15-min ILB. [Results] Decreases in vital capacity and expiratory reserve volume from baseline by water immersion were significantly greater in the CL trial than those in the other trials. In the CL trial, PImax was immediately reduced after ILB compared to that at baseline, and the reduction was significantly greater than those in the other trials. PEmax was not affected by ILB in any of the trials. [Conclusion] Forced respiration during deeper water immersion caused greater inspiratory muscle fatigue in healthy young men.
[目的]本研究旨在评估不同水深的水浸对呼吸功能的影响，以及在不同水深水浸期间吸气负荷呼吸（ILB）对通过最大吸气和呼气压力（分别为PImax和PEmax）评估的呼吸肌力量的影响。[对象]八名健康男性随机参与三项试验。[方法]所有试验均让参与者坐在水浴中进行。我们评估了在三个不同水深水平（脐部；第4肋骨；或锁骨，CL）水浸期间以及随后15分钟ILB后的呼吸功能、PImax和PEmax。[结果]与其他试验相比，CL试验中因水浸导致的肺活量和呼气储备量相对于基线的降低显著更大。在CL试验中，与基线相比，ILB后PImax立即降低，且降低幅度显著大于其他试验。在任何试验中，PEmax均不受ILB影响。[结论]在较深的水浸期间进行强制呼吸会使健康年轻男性产生更大的吸气肌疲劳。
