Johnson A T, Dooly C R, Dotson C O
Agricultural Engineering Department, University of Maryland, College Park 20742, USA.
Am Ind Hyg Assoc J. 1995 May;56(5):467-73. doi: 10.1080/15428119591016881.
To test effects of respirator masks on maximum oxygen uptake, ventilation threshold, and lactate threshold, 14 subjects underwent incremental bicycle exercise with and without masks. There was a statistically significant difference in final oxygen consumption between the two conditions, but other results suggest that the physiological measure of maximum oxygen uptake was not reached at termination for the full-mask condition. Lactate and ventilation thresholds were not affected by mask condition. Hypoventilation while wearing masks caused higher amounts of blood lactate accumulation. The resulting higher mask CO2 levels and lower O2 levels, normally attributed to mask dead volume, may instead be due to mask resistance.
为测试呼吸面罩对最大摄氧量、通气阈值和乳酸阈值的影响，14名受试者在佩戴和不佩戴面罩的情况下进行了递增式自行车运动。两种情况下的最终耗氧量存在统计学上的显著差异，但其他结果表明，在全脸面罩条件下运动结束时未达到最大摄氧量的生理测量值。乳酸阈值和通气阈值不受面罩条件的影响。佩戴面罩时的通气不足导致血液中乳酸积累量更高。通常归因于面罩死腔的面罩二氧化碳水平升高和氧气水平降低，可能反而归因于面罩阻力。
