“…One field study was done with 31 American Air Force ground crew members working in the hot, dry Mohave desert (Rothstein et al 1947) (Fig. 27.2a), and the other with 11 Japanese plus seven Chinese labourers working in hot, humid tropical conditions (Itoh 1953) (Fig: 27.2b); the laboratory study was done with four physically fit young athletes in various controlled laboratory environmental conditions (Greenleaf and Sargent 1965) (Fig. 27.2c).…”