New study tests if low oxygen makes heat stress worse for workers

This study looks at whether low oxygen levels (like at high altitudes) increase the risk of heat stress during moderate work in hot environments. Twenty healthy young and older men will walk on a treadmill in a hot room, once with normal oxygen and once with low oxygen. Researchers will measure body temperature, heart strain, and other signs to see if current safety guidelines need updating for combined heat and low-oxygen conditions.