Análise do torque de resistência e da força muscular resultante durante exercício de extensão de quadril no Pilates e suas implicações na prescrição e progressãon

Abstract

Background: The understanding of the external mechanics of Pilates exercises and the biomechanics of the joints may guide the prescription of rehabilitation exercises. Objectives: To evaluate the resistance torque (rR) during hip extension (HE) exercises performed on the Pilates Cadillac. To perform a biomechanic analysis of the ΓR and the weighted mean moment arm (WMMA) in order to calculate the resultant muscle force (FMR) of the hip extensors and flexors. To present a mechanical criteria for progression of HE exercise on the Pilates Cadillac. Methods: Fourteen participants performed HE exercises on the Cadillac in four randomly assigned situations-using two springs (blue and red), which were attached in two positions (high and low). Angular positions were measured using an electrogoniometer. In order to calculate ΓR, the muscle torque (ΓM) and FMR, free-body diagrams and movement equations were used The WMMA of the hip extensors and flexors were estimated from the literature. Results: The ΓRand FMR presented a similar behavior during all situations; however, the maximum ΓR values did not occur at the same joint position as the FMR maximum values. The WMMA of the hip fexors presented an increased-decreased behavior with greatest values around 55° of flexion, while the hip extensors presented a similar behavior with greatest values around 25° of flexion. Conclusion: Biomechanic analysis of HE exercises and the evaluation of mechanical features in relation to the hip joint may be used as an objective criteria for the prescription and progression of HE exercise in Pilates. ©Revista Brasileira de Fisioterapia.