According to the International Association of Athletics Federations (IAAF) and its official regulations:
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Rule 144.3(b)
Possession or use of video or cassette recorders, radios, CD, radio transmitters, mobile phone or similar devices in the competition area.
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Rule 144.3(c)
Except for shoes complying with Rule 143, the use of any technology or appliance that provides the user with an advantage which he would not have obtained using the equipment specified in the Rules.
Does music help you to run faster?
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'Music is a legal drug for athletes," claims Dr Costas Karageorghis, an expert on the effects of music on exercise, at Brunel University. In his latest book, Inside Sport Psychology, he claims that listening to music while running can boost performance by up to 15%.
Jennifer Goebel was disqualified from winning the 2009 Lakefront Marathon in Milwaukee because she was wearing an iPod during the final miles of the race. She was accused of 'psychological doping'.
In last year's Italian competition of 30 kilometers Forli - Ravenna, 25 participants were disqualified for using MP3 players.