Effects of low level laser therapy in the electromyographic fatigue of bíceps brachi muscle before and after a resistive program training in young males

INTERVENTION: E02.594.540 Experimental group 1: 15 health male subjects receive active low level laser therapy after performing quadriceps femoris muscle strengthening exercise. Experimental group 2: 15 health male subjects receive placebo low level laser therapy after performing quadriceps femoris muscle strengthening exercise. Control group: 15 health male will be assessed but won´t not receive low level laser therapy, and they will not be submitted to the quadriceps femoris muscle strengthening exercise. The training will be done twice a week, lasting up to 10 minutes per session. The allocation of the volunteers in each group was made randomly. Subjects of experimental grroup 1 and 2 performed the exercise during 8 weeks, twice a week. Control group also was reevaluated after 8 weeks. CONDITION: C10.597.613.612 G11.427.550 muscle fatigue; muscular atrophy ; G11.427.550 ; C10.597.613.612 PRIMARY OUTCOME: Measurement of long head of bíceps brachii electromyographic fatigue before and 24 hours after bíceps brachii resistance training. Also those analyses will be maden in the control group, with 8 weeks apart. The hypothesis is that active laser group will show lower values of fatigue when compared to placebo and control group, and that placebo group will show lower values when compared to control group. INCLUSION CRITERIA: Full active range of motion and no pain in the shoulder, elbow and wrist; Absence of fracture or previous surgery on spine and upper extremities; Considered insufficiently active for IPAQ; Not be in training for at least six months. SECONDARY OUTCOME: Analysis of blood lactate concentration before and after biceps brachii resistance training. This analysis will be made in the control group, with 8 weeks apart. Blood lactate is measure through a blood sample collected from the ear lobe. The hypothesis is that active group will show lower values when compared to placebo group, and that placebo will show greater values when compared to control group. There will be not show difference in the control group. Analysis of normalized electromyographic activity of biceps brachii resistance training. This analysis will be made in the control group, with 8 weeks apart. The hypothesis is that active group will show greater values when compared to placebo group, and that placebo will show greater values when compared to control group. There will be not show difference in the control group. Analysis of rate of force development before and after biceps brachii resistance training. This analysis will be made in the control group, with 8 weeks apart. Rate of force development é calculated through the derivate of force peak by the minimum time necessary to reach the peak force. The hypothesis is that active group will show greater values when compared to placebo group, and that placebo will show greater values when compared to control group. There will be not show difference in the control group. Evaluation of load progression values of biceps brachii muscle resistance training, through 1‐ maximum repetition, before anf after 8 weeks of quadriceps femoris resistance training in active and placebo group. Also, 1MR will be evaluated twice at placebo group, with 8 weeks apart. The hypothesis is that active group will show greater values of 1MR final when compared to placebo group. Also, placebo group will show greater values of final 1MR when compared to control group. Evaluation of load progression values of biceps brachii muscle resistance training, through 1‐ maximum repetition, measured after 2, 4, 6 weeks of biceps brachii resistance training in active and placebo group. The hypothesis is that active group will show greater values of progression load when compared to placebo group