Aging brings a decrease of the muscle strength which, consequently, in the balance, is closely related with the rate of force development (RFD) in muscle structure. Many studies show the effects of the decrease in RFD on different joints; however, few of them analyze the relation between RFD and the abductor and adductors hip muscles. Therefore, the present study has the objective to compare the RFD of the abductor and adductor hip muscles between young people and elderly people with falls history and elderly people with no falls history. To the group of elderly there will be evaluated those individuals of Ribeirão Preto's community with sixty years old or more, and for the group of young people will be evaluated individuals of the university population of USP - Ribeirão Preto, at age between 18 and 35 years old. On the first day of evaluation the participant will be submitted to the familiarization with the isokinetic dynamometer equipment Biodex - System 4 Pro (Boston/USA). On the second day, to the evaluation of RFD of the abductor and adductor hip muscles, the participant will be submitted to the strength test using the isokinetic dynamometer. The torque dates will be collected with an electromyography module (EMG system) connected with the isokinetic dynamometer to obtain a sampling frequency of 2000Hz. The statistics analyses will be realized by GraphPadPrism version 5.0 to Windows (GraphPad Software, San Diego, Califórnia, USA); the level of significance adopted will be of 5% (p<0,05) and the results will be expressed as the mean and standard deviation. It is expected to find a significant difference between the initial and late intervals of the RFD abductor and adductor hip muscles when compared with the young and elderly population, with an injury of this function in elderly, as well as lower RFD in elderly people with history of falls, compared to those with no history of falls.
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