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Sydney mclaughlin has taken gold and smashed her own world record in the women s 400 metre hurdles shaving almost half a second off the old mark. there were five personal bests in the race, giving you an indication of what a high calibre contest it was. one of the hot topics in the athletics at tokyo is shoes. a new generation of running spikes with rigid plates and cushioning foam are some say a significant factor in the consistent breaking of records we re seeing in tokyo. supporters call it a revolutionary advance after years of stagnation. critics think it s a form of mechanical doping. geoff burns is a biomechanics researcher at the university of michigan, an expert in running shoe technology and a runner himself, he s been speaking to our correspondent lucy hockings, who is in tokyo. it s a really highly responsive foam and a stiff plate going through it. ....

Sydney Mclaughlin , World Record , Womens 400 Metre Hurdles , At Tokyo Is Shoes , Geoff Burns , Biomechanics Researcher , Running Shoe Technology , University Of Michigan , Lucy Hockings ,