Radio transmitters keep tabs on players

时间:2019-03-08 07:10:07166网络整理admin

By Ian Anderson SPORTS people who are pushing themselves too hard could soon be identified before it’s too late by a system called PlayTrac, which will also help coaches assess the performance of players and plan tactics. PlayTrac has been developed by Pineapplehead, a software company in Melbourne which has been working with researchers at the Royal Melbourne Institute of Technology. Players wear a radio transmitter-receiver called a transponder. The prototype is a flat rectangle about 6 centimetres by 4 centimetres. The team hopes to shrink this to a disc about 3 centimetres across that can be sewn into sportswear. The transponder, powered by watch batteries, has an antenna which sends signals to three receivers around the playing field. During training, physiological information, such as heart rate, is relayed to medical staff from two electrodes strapped to the player’s body. “Each coach will know the anaerobic threshold of individual players,” says Lamb. “They will know how much running they can handle based on match day conditions.” And by knowing the position of the receivers, it will be possible to analyse players’ movements, based on the precise timing of the arrival of the signal at each receiver. If all players on a field wear a transponder, coaching staff will be able to decide tactics during a game with the aid of laptop computers. Data are updated four times a second, and the system is accurate to within half a metre. Pineapplehead is still filing patents, so will not reveal the frequencies of the signals used by its system. However,