Playing and working in heat is “hot topic” in the media for at least a few days every year at the Australian Open Tennis. It affects players but also other people working and volunteering at the tennis; umpires, line umpires and children “working” as ball retrievers and ferrying sweaty towels to and fro the players.
The Sports Medicine Australia guidelines say at 30C WBGT to consider postponement as the risk is extreme. But Tennis Australia raise this to 34C WBGT. Moving the goalposts is obviously more convenient for the conduct of the tournament but is it safe/reasonable to operate outside the guidelines?
>26C Wet Bulb Globe Temperature
Sports Medicine Australia: Risk of thermal injury is high/very high. Limit intensity. Limit duration to less than 60 minutes per session.
Tennis Australia: No guideline. Presumably don’t worry.
>30 C Wet Bulb Globe Temperature
Sports Medicine Australia: Risk of thermal injury is extreme. Consider postponement to a cooler part of the day or cancellation.
Tennis Australia: Changes to scoring formats (complicated – see the guidelines) OR A ten minute break between second and third sets in best of three.
>34 C Wet Bulb Globe Temperature
Tennis Australia: Suspend play.