Abstract
PURPOSE: To compare performance of trunk flexor and extensor muscles between symmetric and asymmetric styles swimmers. METHODS: Twelve elite velocity swimmers, divided in symmetric swim group (N = 12 (11 male); 20.5 ± 3.1 years; BMI = 22.9 ± 1.5 Kg/m2) and asymmetric swim group (N = 8 (7 male); 21.3 ± 5.5 years; BMI = 23.0 ± 2.4 Kg/m2), and without a history of spinal injury were studied, were submitted to an trunk (agonist-antagonist) isokinetic evaluation (Cybex 6000 isokinetic dynamometer) at 90 degree/sec (4 repetitions) and 120 degree/sec (4 repetitions). Peak torque (PT), time to PT, power and agonist-antagonist (flex/ext) ratio were compared between groups. RESULTS: Asymmetric swim group displayed higher extensor muscles power (P < 0.05) for both 90 (±) and 120 degree/sec (±), and lower time to PT of extensor muscles (P < 0.05). There were no significantly differences in any other variable assessed. CONCLUSIONS: In asymmetric swimmers, the trunk extensor muscles show higher power (muscular work as a function of time) when compared to the symmetric swimmers.TABLE 1: Isokinetic evaluation (* Different (P < 0.05) from Symmetric-Extension).
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