Final answer:
Heat stress is the condition that results from a combination of environmental and physical work factors affecting the body's heat load, making it a challenge to regulate temperature through normal mechanisms such as sweating.
Step-by-step explanation:
The heat disorder that is a combination of environmental and physical work factors that compose the heat load imposed on the body is known as Heat stress. This condition occurs when the body is unable to cool itself down and properly dissipate heat through mechanisms like sweating and breathing.
It's a holistic term encompassing several heat-related disorders, each varying in severity from heat cramps and heat exhaustion to the more serious heat stroke. Factors that contribute to heat stress include high temperatures, humidity, direct sun exposure, limited air movement, physical exertion, and insufficient hydration or breaks. With age, the body's ability to handle these stresses decreases, making older individuals more susceptible to heat-related illnesses.