Research Group of Physical Exercise and Human Performance, Mare Nostrum Campus, University of Murcia, 30100 Murcia, Spain.
Int J Environ Res Public Health. 2023 Mar 10;20(6):4935. doi: 10.3390/ijerph20064935.
Tolerance to breathing in conditions with a decreased oxygen ratio is subject-specific. A normobaric hypoxia tolerance test (NHTT) is performed to assess the ability of each individual, as this may be influenced by genetic or personal factors such as age or gender. The aim of this study is to test the influence of deep breathing on hypoxia tolerance time.
A total of 45 subjects (21 parachutists and 24 students) performed two NHTTs at 5050 m altitude (iAltitude). Arterial (SatO) and muscle (SmO) oxygen saturation were monitored with the Humon Hex device. The first NHTT was performed with free breathing, without any instructions; and the second NHTT was performed with wide, slow, diaphragmatic breathing. The NHTT was terminated at the end of 10 min or when a value of less than 83% was obtained.
The first NHTT was completed by 38.1% of parachutist and 33.3% of students while the second NHTT was completed by 85.7% and 75%, respectively. In the second NHTT, both parachutists and students had a significantly ( = 0.001) longer duration compared to the first NHTT. SmO and SatO values also increased significantly ( < 0.001) in both groups ( < 0.05).
Performing controlled diaphragmatic breathing is successful in increasing hypoxia tolerance time and/or SatO values.
对低氧比例环境下呼吸的耐受能力因人而异。常压低氧耐受测试（NHTT）用于评估个体的能力，因为这可能受到遗传或个人因素的影响，如年龄或性别。本研究旨在测试深呼吸对低氧耐受时间的影响。
共有 45 名受试者（21 名跳伞者和 24 名学生）在 5050 米海拔高度进行了两次 NHTT（iAltitude）。使用 Humon Hex 设备监测动脉（SatO）和肌肉（SmO）氧饱和度。第一次 NHTT 是在自由呼吸、没有任何指导的情况下进行的；第二次 NHTT 是在宽、慢、横膈膜呼吸的情况下进行的。NHTT 在 10 分钟结束时或当获得小于 83%的值时终止。
第一次 NHTT 完成了 38.1%的跳伞者和 33.3%的学生，而第二次 NHTT 分别完成了 85.7%和 75%。在第二次 NHTT 中，跳伞者和学生的持续时间都明显（=0.001）比第一次 NHTT 长。两组的 SmO 和 SatO 值也都显著增加（<0.001）（<0.05）。
进行控制性横膈膜呼吸成功地增加了低氧耐受时间和/或 SatO 值。
