A 3pm game between Canberra United and Western United resulted in multiple players experiencing symptoms of heat strain, prompting the APL to revise its threshold.
"The trouble with the WBGT index is that it's used for a variety of purposes for which it wasn't developed," Jay told ABC.
"A lot of these devices ... don't measure natural wet bulb temperature, which is 70 per cent of the WBGT value. You're not measuring it — you're estimating it — so that's a bit of an issue. Additionally, you might have a device, but the type of device and the way it's being used, the duration of the measurements being taken, how stable they are, is absolutely essential.
"The Bureau of Meteorology, obviously they're not located directly where the play is taking place," he said. Brisbane Roar forward Shea Connors had to be treated for suspected symptoms of heat strain during an ALW match last year. A third is that double-header games, which often see ALW games played earlier in the day before the ALM, are removed entirely, meaning ALW games take place in separate, smaller stadiums but at later times.
"The Australian Open heat stress scale gives players and organisers a better sense of how the risk is escalating," he said.
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