Introduction Experimental studies conducted in young animals show that therapeutic ultrasound (TUS) has been successfully used to shorten the healing time of bone fractures. However, they were not found in the literature, studies comparing the effect of different intensities of UST in aged animals. Objective To test the efficacy of intensity 1.0 W/cm2 and of 0.5 W/cm2 in the consolidation of experimental fracture of the tibia from aged Wistar rats. Materials and methods Three groups of 15 month old rats were submitted to a midshaft osteotomy of the tibia and then, the hind member was immobilized with a metal splint and plaster of Paris, wrapping the knee and ankle joint. One group (L), received ultrasound at 0.5 W/cm2; the other group (I), were exposed to ultrasound at 1.0 W/cm2. One control group (C), did not receive the ultrasound. Fifteen animals (five from each group) were euthanatized at the end of the first week and fifteen (five from each group) at the end of the third week. The progress of the fracture healing was performed for each group by morphometric analysis of histological sections of the fracture region. Results and conclusion The results showed that fractures treated with ultrasound at 1.0 W/cm2 healed significantly faster than did the fractures treated with ultrasound at 0.5 W/cm2 and the control.
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.
Agradeço ao Prof. Dr. Celso Ricardo Fernandes de Carvalho pela sua disponibilidade e atenção, ainda no início deste trabalho Ao meu professor, amigo e orientador Prof. Dr. Rubens Corrêa Araujo, os meus sentimentos de admiração, respeito e amizade, desde os tempos de graduação. Agradeço por ter sido seu aluno, por seu conhecimento e pelos seus ensinamentos! Agradeço à Prof a . Dr a . Júlia M. D. Greve, ao Prof. Dr. André Pedrinelli e ao Prof. Dr. Júlio C. Serrão pelas importantes contribuições no exame de qualificação Obrigado Prof. Dr. Luis Mochizuki pela suas orientações, pelas dicas na elaboração do trabalho e sua disponibilidade para ajudar! Agradeço ao Prof. Dr. Semaan El Razi Neto, pelos seu conhecimentos, amizade e compreensão da minha ausência em alguns trabalhos! Obrigado Prof a . Ms. Márcia Barbanera pela ajuda na elaboração deste trabalho e pela sua amizade! Agradeço ao Prof. Dr. Ulysses Fernandes Ervilha pelas nossas poucas, porém importantes, discussões! Obrigado! Ao meu amigo Prof. Daniel Rogério de Matos Jorge Ferreira, agradeço pela sua amizade, pela ajuda e pelas risadas durante os almoços na universidade!! Agradeço à Prof a . Ms. Aline Bigongiari pela sua disponibilidade de tempo e importante colaboração na etapa final! Agradeço ao Prof. Márcio Tubaldini pela sua amizade de sempre!! Agradeço os amigos e colegas do Laboratório de Biomecânica: Prof a
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.
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