[Evaluation of isokinetic trunk flexion and extension in normal sportsman and sedentary people].

It was studied two groups: Group 1: 13 male voluntaries, competition sportsman, mean age: 25 +/- 2.1 years (18-30): Group 2: 17 male voluntaries, sedentary, mean age: 31.2 years (23-46). All the voluntaries was evaluated by the CYBEX 6000, TEF (trunk flexion extension) module. The parameters analyzed were: peak torque, total work and average power (absolute values and corrected by the body weight) and the flexion/extension relation. All the tests were performed at the speed of 60 and 120 degrees per second. The peak torque absolute values at 60 and 120 degrees were higher in Group 1 than Group 2 (p < 0.05), in flexion and extension movement. At the corrected date by the body weight, this relation remained the same, at 60 degrees, for flexion and extension and for extension at 120 degrees (p < 0.05), but the flexion at 120 degrees is not different in both groups. The peak torque angle is the same for extensor tests at both speed, but is different for the flexor test, at 60 degrees. The total work performed was better in the Group 1 at 60 degrees during the flexion (p < 0.05) and during the extension in both tested speed. At the corrected values the work is the same at flexion and at extension is higher only at 120 degrees (p < 0.05). At the average power of flexion movement there is a difference at the absolute values, that was not seen at the body weight corrected date. The difference between average power of the extension, in both speeds was significant at 60 and 120 degrees. The relation between flexor and extensor: Group 1: peak torque 80% at 60 degrees, total work and average power is nearly 100%; Group 2: peak torque, total work and average power is closed to 100%, at 60 degrees. The flexor muscles values are light higher than the extensor muscles, that means the abdominal muscles are stronger than the spine erector muscles. At 120 degrees this tendency is more clear and the relation is 120-125% and at the sedentary group this relation is higher: 150-165%.