Sloane Christian, Chan Theodore C, Kolkhorst Fred, Neuman Tom, Castillo Edward M, Vilke Gary M
Department of Emergency Medicine, University of California, San Diego Medical Center, 200 W. Arbor Dr., MC-8676, San Diego, CA 92013-8676, United States.
School of Exercise and Nutritional Sciences, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182-7251, United States.
Forensic Sci Int. 2014 Apr;237:86-9. doi: 10.1016/j.forsciint.2014.01.017. Epub 2014 Feb 14.
The study sought to determine the physiologic effects of the prone maximum restraint (PMR) position in obese subjects after intense exercise. We designed an experimental, randomized, cross-over trial in human subjects conducted at a university exercise physiology laboratory. Ten otherwise healthy, obese (BMI>30) subjects performed a period of heavy exertion on a cycling ergometer to 85% of maximum heart rate, and then were placed in one of three positions in random order for 15min: (1) seated with hands behind the back, (2) prone with arms to the sides, (3) PMR position. While in each position, mean arterial blood pressure (MAP), heart rate (HR), minute ventilation (V˙E), oxygen saturation (SaO2), and end tidal CO2(etCO2) were measured every 5min. There were no significant differences identified between the three positions in MAP, HR, V˙E, or O2sat at any time period. There was a slight increase in heart rate at 15min in the PMR position over the prone position (95 vs. 87). There was a decrease in end tidal CO2 at 15min in the PMR over the prone position (32mmHg vs. 35mmHg). In addition, there was no evidence of hypoxia or hypoventilation during any of the monitored 15min position periods.
In this small study of obese subjects, there were no clinically significant differences in the cardiovascular and respiratory measures comparing seated, prone, and PMR position following exertion.
本研究旨在确定肥胖受试者在剧烈运动后采取俯卧位最大约束（PMR）姿势的生理效应。我们在大学运动生理学实验室对人类受试者设计了一项实验性、随机、交叉试验。10名其他方面健康的肥胖（BMI>30）受试者在自行车测力计上进行一段时间的剧烈运动，达到最大心率的85%，然后随机依次置于三个姿势之一15分钟：（1）双手背后就座，（2）双臂放于身体两侧俯卧，（3）PMR姿势。在每个姿势期间，每5分钟测量一次平均动脉血压（MAP）、心率（HR）、分钟通气量（V˙E）、氧饱和度（SaO2）和呼气末二氧化碳（etCO2）。在任何时间段，三个姿势之间的MAP、HR、V˙E或氧饱和度均未发现显著差异。在15分钟时，PMR姿势的心率比俯卧姿势略有增加（95对87）。在15分钟时，PMR姿势的呼气末二氧化碳比俯卧姿势有所下降（32mmHg对35mmHg）。此外，在任何监测的15分钟姿势期间均未发现缺氧或通气不足的证据。
在这项针对肥胖受试者的小型研究中，运动后就座、俯卧和PMR姿势在心血管和呼吸指标方面没有临床显著差异。
