Players Keep Their Cool With Helmet Sensor 

A British company has developed technology to save American footballers from dying of heat stroke.

Psion has helped devise the Hothead helmet, which contains a heat sensor to relay the player's body temperatures to coaches on the touchline.

When a player's body temperature reaches a dangerous level an alert is sent through a radio link to warn coaches he needs to be brought off to cool down.

Each year around 10,000 high school athletes in the US suffer serious heat-related illnesses, the majority through gruelling August pre-season training in high temperatures wearing helmets and padding.

The National Centre for Catastrophic Sport Injury Research said that on average eight players a year died of heat stroke.

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