The influence of strength training in bilateral deficit for extension and knee flexion

The object of this study was to care out a force training composed of 2 (two) sets of 10 (ten) maximal repetitions in the knee extensor and flexor chair, with duration of 8 (eight) weeks and frequency of 3 (three) Times in the week. Sixty-nine subjects were randomly assigned to three groups: the Unilateral Group (GU, n=23), performed the training with one leg at a time, Bilateral Group (GB, n=23) underwent training with both legs simultaneously and Control Group (GC, n=23) who did not perform any training in this period. Before and after training, or not training, the individuals had their maximum strength UL and BL for extension (E) and knee flexion (F) evaluated in the isokinetic dynamometer. Both GU and GB produced a statistically significant increase (p<0.001) in peak torque of knee extensors and flexors from the pre-intervention moment to the post-intervention moment in the right, left and bilateral limbs. The CG did not present statistically significant differences in the peak torque of knee extensors and flexors from the pre-intervention moment to the postintervention moment in the right limb (p=0.769 and p=0.252, respectively) and left (p=0.903 and p=0.114, Respectively). However, for the peak torque of the knee flexors, the CG presented a statistically significant increase (p=0.004) in the bilateral test from the preintervention moment to the post-intervention moment. There was a reduction in bilateral deficit, from the pre-post to the post, only for the group that performed bilateral training in both the extensors (p<0.001) than the experimental groups for the extensors. The training groups did not present significant difference between them for (P=0.822), right unilateral (p=0.542) and left unilateral (p=0.423). With the designation of force effect size in untrained, classified as: trivial 0.5 1.25 2.0). We observed in the extensors that GB produced a large effect on the force gain in the bilateral pre-post-training test and that UL execution produced a moderate effect on the UL (D and E) strength gain. In flexion we observed that bilateral execution also produced a great effect on the strength gain in the ULD, ULE and BL tests and in the UL execution we also observed a great force gain effect in the ULD test and a moderate effect in the ULE test and the BL test. In relation to the size of the TF effect produced in the DB, we observed that there was a small effect on DB reduction for both extensors (1.19) and flexors (0.67) and that GU and GC also had a reduction in DB, From pre-post-training, but this reduction was trivial. We concluded that any form of force training, unilateral or bilateral, produces a significant force gain in untrained individuals, we also verify the existence of DB in extension and knee flexion in untrained youth and that bilateral training may be more efficient In reducing this DB