Effect of an experimental fatigue protocol applied to the quadriceps femoris muscle of physically active persons

• Autor(a) principal: Bersotti,Felipe Marrese
• Data de Publicação: 2019
• Outros Autores: Melo,Tamiris Barbosa de, Mochizuki,Luis, Skau,Jerônimo Rafael
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Motriz (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-65742019000400306
• topic: biomechanics; muscle fatigue; isokinetic dynamometer; knee

Abstract Aims: 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.