Physiological Responses to Wearing the Helicopter Aircrew Integrated Life Support System (HAILSS) in Hot Environments

摘要

Individuals wearing encapsulating garments require auxiliary cooling systems to sustain physical and cognitive performance when exposed to high temperatures or workloads. The Helicopter Aircrew Integrated Life Support System (HAILS S) is designed to minimize thermal problems by incorporating normal flight suit functions with protective functions fire, chemical and biological warfare (CBW), and cold water immersion in a single, integrated clothing ensemble. This study evaluated the effectiveness of the HAILSS cooling concept by comparing heat loads incurred while performing up to 6 hi of physical work in either HAILSS or the current A/P22P-9(V) CBW protective ensemble. This study exposed seven test subjects (six male, one female) to six experimental trials each. Subjects wore the HAILSS (h20, h75) and CB m20, HAILSS% N 75 35 (a) Need for head ventilation (b) Airflow though breathing valve adequate but saliva a problem, mouth too were M.L.nt moderate physical work (40% of an individual's maximum oxygen uptake) and cognitive tasks. In addition, each subject had one exposure using HA%S without the chemical protective AR-5 hood (h75n) and another employing HAILSS with cooled ventilation air (24C inlet air temperature) (h75c) in the hot/humid condition. Test results indicated 20% RH trials lasted significantly longer (p