Babb T, Turner N, Saupe K, Pawelczyk J
Laboratory for Human Performance Research, Pennsylvania State University, University Park 16802.
Am Ind Hyg Assoc J. 1989 Feb;50(2):105-11. doi: 10.1080/15298668991374372.
Performance time for a 3.2-km (2-mi) run at maximal voluntary speed was determined for 12 subjects under seven experimental conditions: resistance breathing (R), hypercapnia (C), hot air breathing (H), and combinations R + C, R + H, H + C, and R + H + C. The tests were performed on a treadmill at 5% grade. Performance time was increased significantly when the subjects were exposed to resistance breathing alone (9%) or to any combination condition containing resistance (16%-31%). The effect of breathing resistance was not specific to the presence or absence of C, H, or their combination. Nevertheless, the physiological effects were not additive and could not be predicted by knowing the effects of the individual stresses. Performance time also was increased in Condition H + C (9%). Pulmonary ventilation was the most affected physiological variable, significantly reduced in Conditions R, H, C + R, H + R, and H + C + R. In conclusion, a multistress approach should be used when determining physiological responses or performance limitations brought about by real or simulated industrial respirator-wear conditions.
在七种实验条件下，测定了12名受试者以最大自主速度进行3.2公里（2英里）跑步的成绩时间：阻力呼吸（R）、高碳酸血症（C）、热空气呼吸（H）以及组合条件R + C、R + H、H + C和R + H + C。测试在坡度为5%的跑步机上进行。当受试者单独进行阻力呼吸时（增加9%）或处于任何包含阻力的组合条件下（增加16%-31%），成绩时间显著增加。呼吸阻力的影响并不特定于C、H的存在与否或它们的组合。然而，生理效应并非叠加性的，无法通过了解单个应激的效应来预测。在H + C条件下成绩时间也增加了（9%）。肺通气是受影响最大的生理变量，在R、H、C + R、H + R和H + C + R条件下显著降低。总之，在确定实际或模拟工业呼吸器佩戴条件所带来的生理反应或性能限制时，应采用多应激方法。
