Fatigue is associated with the loss in strength and work capacity. In swimmers, the compromise of swim technique has been attributed to the loss in propulsive force throughout competitions and constant speed exercises performed to exhaustion. Thus, the objectives of this study are: to analyze the reliability of isometric peak torque (PTI) and concentric peak torque at 60 and 180°.s-1 (PTC60 and PTC180, respectively) and the rate of force development (TDF) of triceps and biceps muscles and to verify in the relationship between muscle fatigue and the change in swim technique, in an exhaustive exercise in front crawl. Middle and long-distance swimmers will perform the following protocols 1) determination of anthropometric measures and familiarization to the dynamometer; 2) maximal performance in the distance of 400 m to determine the aerobic performance (V400); 3) strength tests in an isokinetic dynamometer to determine PTI, PTC60, PTC180 and TDF, performed immediately before and immediately after an exhaustive swim test in constant speed at 100%V400. The procedure of item 3 will be performed two times, in different days, to analyze the reliability of strength and swim technique variables. The existence of normality of the data will be checked by Shapiro-Wilk test. To analyze the reliability of the variables a Student t test for paired data, intraclass correlation coefficient, typical error and confidence interval will be utilized. The effect of the exhaustive exercise will be analyzed by Student t test for paired data and Mann-Whitney test.
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