Institute of Metrology and Biomedical Engineering, Faculty of Mechatronics, Warsaw University of Technology, 02-525 Warsaw, Poland.
Department of Applied Physiology, Mossakowski Medical Research Institute, Polish Academy of Sciences, 02-106 Warsaw, Poland.
Sensors (Basel). 2021 Sep 17;21(18):6233. doi: 10.3390/s21186233.
The current diagnostic procedures for assessing physiological response to exercise comprise blood lactates measurements, ergospirometry, and electrocardiography. The first is not continuous, the second requires specialized equipment distorting natural breathing, and the last is indirect. Therefore, we decided to perform the feasibility study with impedance pneumography as an alternative technique. We attempted to determine points in respiratory-related signals, acquired during stress test conditions, that suggest a transition similar to the gas exchange threshold. In addition, we analyzed whether or not respiratory activity reaches steady states during graded exercise. Forty-four students (35 females), practicing sports on different levels, performed a graded exercise test until exhaustion on cycloergometer. Eventually, the results from 34 of them were used. The data were acquired with Pneumonitor 2. The signals demonstrated that the steady state phenomenon is not as evident as for heart rate. The results indicated respiratory rate approaches show the transition point at the earliest (more than 6 min before the end of the exercise test on average), and the tidal volume ones at the latest (less than 5 min). A combination gave intermediate findings. The results showed the impedance pneumography appears reasonable for the transition point estimation, but this should be further studied with the reference.
目前评估运动生理反应的诊断程序包括血乳酸测量、运动心肺功能测试和心电图。前两者不是连续的，后者需要特殊设备来干扰自然呼吸，而且最后一种方法也是间接的。因此，我们决定使用阻抗呼吸描记术作为替代技术进行可行性研究。我们试图确定在应激测试条件下获得的呼吸相关信号中的点，这些点提示类似于气体交换阈值的转换。此外，我们还分析了在分级运动期间呼吸活动是否达到稳定状态。44 名（35 名女性）不同运动水平的学生在自行车测力计上进行了直至力竭的分级运动测试。最终，其中 34 人的结果被使用。数据是使用 Pneumonitor 2 采集的。这些信号表明，与心率相比，稳定状态现象并不那么明显。结果表明，呼吸率接近显示最早的转折点（平均在运动测试结束前 6 分钟以上），而潮气量显示最晚（不到 5 分钟）。两者的组合得出了中间的发现。结果表明，阻抗呼吸描记术似乎可以合理地估计转折点，但这需要进一步研究。
