While the health benefits of Bikram are widely recognized, some find the heat oppressive and complain of feeling dizzy or nauseous during the class.

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Quinton Barham, 13, from Trowbridge, was playing for Bradford Town YFC earlier this month when he came off the pitch feeling dizzy, and collapsed.

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Jankovic, who needed to call the physio after feeling dizzy in the first set, was less than generous in hailing her opponent, who had 38 winners to the losers 13.

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Are you feeling dizzy from that blizzard of information?

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At very high doses, exposure to a magnetic field can cause the muscles to twitch and some people have reported feeling dizzy or sick when moving their heads quickly around a high-field magnet.

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The ambulance service spokeswoman said three of the patients were taken to hospital after complaining of feeling "unwell, dizzy, and hot".

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