The aim of this study is to investigate the effect of knee extensors fatigue on joint position sense. Fifteen healthy participants, all males, with no history of previous musculoskeletal lesions were recruited. Evaluation of the knee joint position sense and the muscle fatigue protocol had been performed using an isokinetic dynamometer. Fatigue was considered when the maximum torque was reduced by 50%. The joint position sense was analyzed by the absolute error and the variable error. The paired t-test was used to compare the mean in pre and during muscle fatigue conditions. The level of significance was 5%. Absolute and variable errors were not significantly affected by muscle fatigue. Knee joint position sense does not seem to be affected by fatigue of knee joint extensors.

No abstract

RESUMO Independentemente da natureza dos acidentes que ocorrem diariamente, as consequências frequentemente exigem reabilitação especializada. Este estudo pretende verificar qual setor de fisioterapia ambulatorial de um instituto de ortopedia e traumatologia apresenta maior prevalência de fichas de encaminhamento para atendimento. Além disso, pretende verificar qual gênero predomina e qual é a relação entre as faixas etárias e os setores de fisioterapia ambulatorial de um hospital de referência da cidade de São Paulo. Trata-se de um estudo prospectivo realizado entre março e dezembro de 2016 com uma amostra de 1507 fichas de encaminhamento ao Ambulatório de Fisioterapia do Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo. O estudo mostrou que o setor Trauma em Fisioterapia Ambulatorial apresenta maior quantidade de fichas de encaminhamento, que o gênero masculino foi predominante e que há uma correspondência das relações entre diferentes faixas etárias e os setores de Fisioterapia Ambulatorial.

The purpose of this study was to test an experimental fatigue protocol for the knee joint extensor muscles performed on an isokinetic dynamometer. Method: SPIRIT recommendations were applied. Participants were 40 healthy, young men and women. Protocol: The pre-fatigue quadriceps femoris peak torque during concentric maximum voluntary contractions (MVC) at 60º/s was measured. During the first protocol part, the task was to do MVC at 60°/s until a sequence of five concentric MVC was below 40% of its initial value. For the second part, intermittent quadriceps femoris muscle and hamstrings maximum voluntary isometric contractions for 30 s (ratio 2/1 seconds). Thirty seconds after the isometric MVC (post-fatigue), they did three concentric MVC. Then, after 5 minutes of absolute rest, they did two concentric MVC. Men and women showed a lower peak torque due to this protocol (p < 0.001). Conclusion: This protocol was effective for fatigue men and women's quadriceps femoris muscle.