Efeitos do fortalecimento muscular do quadril e tronco sobre a postura da pelve e membros inferiores,considerando o torque passivo prévio do quadril -estudo experimental

Abstract

Introduction: The muscular strengthening of the hip and trunk is able to increase the passive torque of this joint and the lumbopelvic region due to the tissue changes that occur in the musculoskeletal system. Thus, these tissue changes may reflect changes in orthostatic posture of the pelvis and MMII, and may be influenced by biomechanical factors such as, for example, the previous passive torque of the hip. Objective: Therefore, the objective of this study was to investigate the influence of previous passive hip torque on possible changes in pelvis and lower limb posture following a hip and trunk muscle strengthening program. Methods: A study was conducted with 53 women, divided into intervention and control groups, and in subgroups with higher and lower values of previous hip torque. The control group (n = 27) was instructed not to change their usual activities, while the intervention group (n = 26) performed the hip and trunk muscle strengthening program. The kinematics of the lower limb pelvis in the orthostatic posture and the clinical measure of passive torque of the hip were evaluated before and after the strengthening. Results: No significant differences between the subgroups were identified for the variables of interest. Therefore, the magnitude of the previous passive torque of the hip was not a characteristic that influenced the effects of hip and trunk strengthening on the passive torque itself and on the posture of the pelvis and lower limbs. Although no influence was found, some factors should be taken into account: effects on postural changes in the pelvis and lower limbs may be influenced not only by the previous passive torque level of the hip, but also due to the existence of other biomechanical factors such as ankle-foot alignment. In addition, factors such as the time of strengthening, the range of motion used and the non-functional characteristics of the selected exercises may have influenced the absence of difference between the subgroups. Conclusion: The previous passive torque of the hip did not influence the effects of hip and trunk muscle strengthening on the passive hip torque and on the posture of the pelvis and lower limbs. Women with greater or lesser passive anterior hip torque did not present different passive torque gains and, therefore, no change in pelvic and hip posture was observed differentlyfor these subgroups.