How much should the workload be increased each subsequent day for acclimatization in excessive heat?

When acclimatizing to excessive heat, it is recommended to gradually increase the workload by 20% each subsequent day. This approach allows the body to adapt to the higher temperatures and the associated physical stress without overwhelming it. Gradual increase helps to improve physiological responses, such as cardiovascular efficiency, sweat rate, and increase in plasma volume, all of which are critical for maintaining performance and minimizing the risk of heat-related illnesses.

The 20% increment strikes a balance between providing enough stress for adaptation and ensuring that workers do not reach fatigue or heat illness thresholds too quickly. It allows time for the body to adjust, enabling better thermoregulation and a lower incidence of heat-related disorders, such as heat exhaustion or heat stroke.

This methodical approach is particularly vital in environments where heat stress is a concern, highlighting the importance of managing workloads in a way that prioritizes workers' health and safety.