Comparação do efeito agudo do alongamento nas respostas biomecânicas e sensoriais na unidade músculo-tendão entre os membros inferiores

Abstract

Flexibility is frequently investigated in studies in the areas of rehabilitation and sports, with its performance being measured by the maximum range of motion (ADMmax). However, its isolated measurement portrays an incomplete approach due to the multifactorial nature of adaptations to training. Therefore, biomechanical and sensory aspects may have a distinct influence when comparing members of the same individual. The aim of the present study was to compare the acute effect after stretching protocol at a submaximal intensity (ADM50%) in the UMT response in the variables ADMmax, ADMppda, TORQUEmax, TORQUEppda and stiffness of the posterior thigh muscles between the lower limbs. The sample consisted of 16 male individuals, young adults, aged between 18 and 31 years. The volunteers went through two familiarization sessions and one control session. The ADM50% intensity was determined for training, subjectively controlled, also in two training sessions. Six sets of 30s of stretching were performed on the posterior thigh muscles in the isokinetic apparatus (Flexmachine) separated at an interval of 48 to 72 hours. For statistical analysis, means and standard deviation of the variables ADMmax, ADMppda, TORQUEmax, TORQUEppda and stiffness were performed. A two-way analysis of variance (ANOVA) of repeated measures with the factors time (pre and post) and limb (right and left). If the ANOVA F test was significant, Bonferroni's post hoc test was used to identify differences between members. Only the main effect of time was identified, with the average of the post-test being greater than the average in the pre-test with no difference between members in the variables ADMmax (Pre-test: 120.10 ± 14.92 ° and Post-test 128.53 ± 15.07 °) (p = 0,001, d = 0,56), TORQUEmax (Pre-test: 98,58 ± 29,56° and Post-test 107,97 ± 33,20°) (p = 0,001, d = 0,29) and stiffiness (Pre-test: 2,11 ± 0,61° and Post-test 2,36 ± 0,77°) (p = 0,28, d = 0,37). As for the variables ADMppda (Pre-test MIE: 70,71 ± 17,61° and Post-test MIE 74,42 ± 17,27°) (d = 0,21), (Pre-test MID: 69,83 ± 13,52° e Post-test MID 76,33 ± 14,92°) (d = 0,45) (p = 0,21) and TORQUEppda (Pre-test MIE: 25,39 ± 13,02° and Pos-test MIE 25,02 ± 13,09°) (d = 0,28), (Pre-test MID: 26,99 ± 12,34° and Post-test MID 28,89 ± 14,02°) (d = 0,14) (p = 0,45), a significant interaction was identified from the pre-test to the post-test on both members. In this way, the present study concludes that the acute flexibility training in the ADM50% intensity was efficient in increasing the ADMMÁX, and it seems to exert a similarity in the response of the UMT behavior between the members.