Greenbaum R, Malins A F, Davies R, Baskett P J
Br Med J (Clin Res Ed). 1982 Mar 13;284(6318):774-5. doi: 10.1136/bmj.284.6318.774.
The respired air of a volunteer was analysed while he was wearing a variety of integral crash helmets. Observations were made with and without a protective balaclava, bib or scarf, or both. Rebreathing occurred and the peak inspired oxygen tension fell as low as 16.0 kPa (120 mm Hg) with a minimum inspired carbon dioxide of 2.1 KPa (16.0 mm Hg). Accessories worn or attached to the helmet which restrict airflow into the helmet should not be used. Attention should be paid to the "air conditioning" of helmets when worn with flameproof balaclavas and bibs.
在一名志愿者佩戴各种整体式防撞头盔时，对其呼出的空气进行了分析。在佩戴和不佩戴防护头套、围嘴或围巾，或两者都不佩戴的情况下进行了观察。出现了重复呼吸现象，吸入氧气分压峰值降至低至16.0千帕（120毫米汞柱），吸入二氧化碳最低值为2.1千帕（16.0毫米汞柱）。不应使用佩戴或附在头盔上限制气流进入头盔的配件。当与防火头套和围嘴一起佩戴时，应注意头盔的“空调”问题。
