Thigh muscles electromyographic activity during lunge exercise to fatigue

The lunge has a positioning of the lower limbs (LL) differential of the pattern squat, requiring greater classification of the holdings surrounding muscle. The objective was to examine the electromyographic activity (EMG) of the vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF) and semitendinosus (ST) during the execution of the lunge to exhaustion of the LL, positioned frontally and posterior.  Nine active women participated of this study with a mean (SD) age of 22 (3,4) years and body mass 60,3 (4,1) kg. The lunge was divided in two phases, differing only the dominant position of the LL (randomized). The EMG signals were captured by an EMG, and analyzed the RMS values in the concentric phase. The results indicated a significance in time for the LL positioned frontally and posterior (F = 2,51, p ≤ 0,05 and F = 5,88, p ≤ 0,05, respectively) with significant increase in muscle activation and, significance in the muscle (F = 55,60, p ≤ 0,05 and F = 87,51, p ≤ 0,05, respectively) with greater activation of the anterior thigh muscles in relation to posterior. No interaction in the relation of time and muscle (F = 0,49, p = 0,94 and F = 1,11, p = 0,35). The RMS showed no statistically significant differences with regard to the positioning of LL dominant. In conclusion, muscle activity was similar in both positions of the LL, showing increased activation of the VM and VL muscles in relation to the BF and ST, in which they possessed a determinant co-activation in the dynamic stability of the knee. The position of lower limbs during lunge is different from squat without clear understanding on differences in muscle activation. The objective was to compare the electromyographic activity of the vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF) and semitendinosus (ST) during the execution of the lunge to exhaustion of the lower limb, changing position of the legs frontally and posteriorly. Nine active women participated of this study with a mean (SD) age of 22 (3.4) years and body mass 60.3 (4.1) kg. The lunge was divided in two phases, changing the forward leg (random order). The electromyographic signals were captured by an eletromyograph, and the root mean square (RMS) values were analyzed during the concentric phase. There was a significant increase of the RMS in time for the LL positioned frontally and posterior (p< 0,001). For the forward position, the increase of RMS was 50% for VL, 54% for VM and 48% for BF. The backward position had an increase of 75% for VL, 113% for VM, 62% for BF and 48% for ST. The RMS was significantly higher for VM than for ST the forward position (p = 0,03) and ST and BF for the backward position (p = 0,02). No interaction was observed between time and muscle in the electromyigraphic activity. The normalized RMS was not statistically different comparing the forward and backward position of the dominant leg. Muscle activity was similar in both positions of the LL, showing increased activation of the VM and VL muscles in relation to the BF and ST. The aims of this study were verify the differences between the operated limb (OL) and non-operated limb (NOL) and compare the sum of unilateral actions with bilateral results following the test of 10 repetitions maximum (10RM) for the movements of extension and flexion of the knee in patients after reconstruction of anterior cruciate ligament (ACL). Twenty men (37.8±5.7 years; 179.2±4.9 cm; 87.1±7.5 kg) who underwent surgery for ACL reconstruction with autograph in a segment were observed in two different days, in the movements of knee extension and flexion. A student t-test for dependent samples was applied. It was adopted level of statistical significance p < 0.05. The values found for the OL were smaller in relation to the NOL (p < 0.05), as well as the sum of unilateral load was greater than the bilaterally load (p < 0.05) in both movements. In conclusion, there were significant differences for the two movements analyzed and, for comparison between OL and NOL. The position of lower limbs during lunge is different from squat without clear understanding on differences in muscle activation. The objective was to compare the electromyographic activity of the vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF) and semitendinosus (ST) during the execution of the lunge to exhaustion of the lower limb, changing position of the legs frontally and posteriorly. Nine active women participated of this study with a mean (SD) age of 22 (3.4) years and body mass 60.3 (4.1) kg. The lunge was divided in two phases, changing the forward leg (random order). The electromyographic signals were captured by an eletromyograph, and the root mean square (RMS) values were analyzed during the concentric phase. There was a significant increase of the RMS in time for the LL positioned frontally and posterior (p< 0,001). For the forward position, the increase of RMS was 50% for VL, 54% for VM and 48% for BF. The backward position had an increase of 75% for VL, 113% for VM, 62% for BF and 48% for ST. The RMS was significantly higher for VM than for ST the forward position (p = 0,03) and ST and BF for the backward position (p = 0,02). No interaction was observed between time and muscle in the electromyigraphic activity. The normalized RMS was not statistically different comparing the forward and backward position of the dominant leg. Muscle activity was similar in both positions of the LL, showing increased activation of the VM and VL muscles in relation to the BF and ST. The position of lower limbs during lunge is different from squat without clear understanding on differences in muscle activation. The objective was to compare the electromyographic activity of the vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF) and semitendinosus (ST) during the execution of the lunge to exhaustion of the lower limb, changing position of the legs frontally and posteriorly. Nine active women participated of this study with a mean (SD) age of 22 (3.4) years and body mass 60.3 (4.1) kg. The lunge was divided in two phases, changing the forward leg (random order). The electromyographic signals were captured by an eletromyograph, and the root mean square (RMS) values were analyzed during the concentric phase. There was a significant increase of the RMS in time for the LL positioned frontally and posterior (p< 0,001). For the forward position, the increase of RMS was 50% for VL, 54% for VM and 48% for BF. The backward position had an increase of 75% for VL, 113% for VM, 62% for BF and 48% for ST. The RMS was significantly higher for VM than for ST the forward position (p = 0,03) and ST and BF for the backward position (p = 0,02). No interaction was observed between time and muscle in the electromyigraphic activity. The normalized RMS was not statistically different comparing the forward and backward position of the dominant leg. Muscle activity was similar in both positions of the LL, showing increased activation of the VM and VL muscles in relation to the BF and ST.