PHEL curves provide information about stay times for what?

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PHEL curves tell you how long a person can safely stay in a given environment, and that stay time changes with how hard someone is working. As workload increases, metabolic heat production goes up, so the allowable duration before heat strain becomes a risk decreases. These curves map those permissible durations for different workload levels, helping plan task assignments, rest breaks, and cooling needs. They’re not about maximum heart rate, humidity thresholds for heat index, or cooling rates, but specifically about how long you can stay under various loads before taking protective action.