The aim of the study was to determine and to compare the trunk extensor and flexor muscles isocinetic contraction properties of adolescent wrestlers and non-athletes. To meet the target set the following tasks have been formulated: 1. To determine the trunk extensor muscles isocinetic contraction indices of wrestlers and non-athletes performing movements at different rate. 2. To determine the trunk flexor muscles isocinetic contraction indices of wrestlers and non-athletes performing movements at different rate. 3. To compare the ratio of trunk extensors and flexors muscles isocinetic contraction indices of wrestlers and non-athletes.. Six 16 years-old Greco-Roman wrestlers and nine non-athletes of the same age participated in the research. By means of the isokinetic dynamometer of the Biodex System 3 Pro type such functional indices of trunk muscles (extensors and flexors), as maximal and mean peak torque (PT), power, time up to developing maximal PT, as well as the ratio of these indices between trunk muscles (extensors and flexors) have been determined, All these indices were established performing trunk extension and flexion at 3 different angular rates, at 60, 90 and 120 degrees/sec. 1. Trunk extension indices (maximal and mean PT, power) of 16 year-old wrestlers are higher than those of non-athletes of the same age, irrespective of trunk extensors rate that was 60, 90 and 120 degrees/sec, except for the values of power indices performing trunk extensor at the rate... [to full text]