The purpose of this study was to analyse the intra-cyclic variations of velocity in breaststroke through the analysis of its variation in the Centre of Gravity and in an anatomically fixed point - the hip. The aim was to verify whether the intra-cyclic variations of velocity of the hip (videogrametrically assessed - ViVhipl -and velocimetrically measured- ViVhip2) present similar patterns among them, and with the intra-cyclic variations of velocity of the CG (ViV cG) in trained male and female performing 25 m breaststroke at maximum speed. The velocity was registered and analysed via videogrametric kinematic processor using two cameras with dual-media assembling as described by Vilas-Boas et al. [9]. A speedometer with optic reader developed by Lima et al. [3] was used for mechanical velocimetery. Results pointed out that the speedometer can be used as a tool for diagnosing problems within stroke cycle due to the similar velocities patterns of the hip and CG.
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