Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada.
Appl Ergon. 2010 Mar;41(2):251-9. doi: 10.1016/j.apergo.2009.07.009. Epub 2009 Aug 15.
Air consumption, oxygen uptake (VO(2)), carbon dioxide output (VCO(2)) and respiratory exchange ratio (RER=VCO(2)/VO(2)) were measured directly from the self-contained breathing apparatus (SCBA) as 36 professional firefighters (three women) completed scenarios of high-rise stair climbing and fifth floor search and rescue. During stair climbing VO(2) was 75+/-8% VO(2max) (mean+/-SD), RER=1.10+/-0.10, and heart rate=91+/-3% maximum (based on maximum treadmill data). Firefighters stopped climbing on consuming 55% of the air cylinder then descended. In the fifth floor search and rescue VO(2) was slightly lower than stair climbing but RER remained elevated (1.13+/-0.12) reflecting high anaerobic metabolism. The first low air alarm sounded, indicating 25% of the air remaining in a "30-min cylinder", during the stair climb at 8 min with 19 of 36 sounding before 12 min. Aggressive air management strategies are required for safety in high-rise firefighting.
空气消耗量、氧气摄取量（VO₂）、二氧化碳排放量（VCO₂）和呼吸交换率（RER=VCO₂/VO₂）由自给式呼吸器（SCBA）直接测量，36 名职业消防员（3 名女性）完成了高层楼梯攀爬和五楼搜索救援的场景。在楼梯攀爬过程中，VO₂为 75+/-8% VO₂max（平均值+/-SD），RER=1.10+/-0.10，心率为最大心率的 91+/-3%（基于跑步机的最大数据）。消防员在消耗了 55%的气瓶空气后停止攀爬，然后下降。在五楼的搜索和救援中，VO₂略低于楼梯攀爬，但 RER 仍然升高（1.13+/-0.12），反映出高厌氧代谢。第一次低空气警报响起，表明在楼梯攀爬 8 分钟时，“30 分钟气瓶”中还剩下 25%的空气，有 19 名消防员在 12 分钟前发出警报。在高层消防中需要采取积极的空气管理策略以确保安全。
