Waiteman Marina Cabral, Botta Ana Flavia Balotari, Perez Vitória Ozores, de Oliveira Silva Danilo, Pazzinatto Marcella Ferraz, Magalhães Fernando Henrique, de Azevedo Fábio Mícolis, Briani Ronaldo Valdir
Laboratory of Biomechanics and Motor Control (LABCOM), School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente, Sao Paulo, Brazil.
Laboratory of Biomechanics and Motor Control (LABCOM), School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente, Sao Paulo, Brazil.
Clin Biomech (Bristol). 2022 Jan;91:105544. doi: 10.1016/j.clinbiomech.2021.105544. Epub 2021 Dec 6.
Impaired knee extension biomechanics and spinal excitability have been reported in women with patellofemoral pain, but their relationship has not been explored. A significant relationship between them could indicate the need for investigating the potential benefits of disinhibitory interventions for women with patellofemoral pain. Thus, this study aimed to investigate the relationship between vastus medialis Hoffmann reflex and (1) maximal isometric, concentric and eccentric knee extensor strength and rate of torque development; (2) knee extensor torque steadiness; and (3) knee extensor moment during functional tasks; in women with patellofemoral pain.
Spinal excitability of twenty-four participants was assessed by the amplitude of maximal vastus medialis Hoffmann reflex. Knee extensor strength, rate of torque development and torque steadiness were assessed using an isokinetic dynamometer. Knee extensor moment during step-down and stair descent tasks were obtained using a three-dimensional motion analysis system.
A moderate negative relationship was found between vastus medialis Hoffmann reflex and knee extensor torque steadiness (r = -0.35; p = 0.05); whereas a moderate positive relationship was found with maximal isometric knee extensor strength (r = 0.37; p = 0.044). No significant relationships were found between vastus medialis Hoffmann reflex and the other variables.
Our findings provide insight on the relationship between spinal excitability and neuromuscular control of maximal and submaximal isometric torque production in women with patellofemoral pain. Conversely, spinal excitability does not seem to be related with dynamic torques and moments of the knee extensors in women with patellofemoral pain.
据报道，髌股疼痛的女性存在膝关节伸展生物力学和脊髓兴奋性受损的情况，但它们之间的关系尚未得到探究。它们之间的显著关系可能表明有必要研究去抑制干预措施对髌股疼痛女性的潜在益处。因此，本研究旨在调查髌股疼痛女性的股内侧肌霍夫曼反射与（1）最大等长、向心和离心膝关节伸展力量及扭矩发展速率；（2）膝关节伸展扭矩稳定性；以及（3）功能任务期间的膝关节伸展力矩之间的关系。
通过最大股内侧肌霍夫曼反射的幅度评估24名参与者的脊髓兴奋性。使用等速测力计评估膝关节伸展力量、扭矩发展速率和扭矩稳定性。使用三维运动分析系统获取下台阶和下楼梯任务期间的膝关节伸展力矩。
发现股内侧肌霍夫曼反射与膝关节伸展扭矩稳定性之间存在中度负相关（r = -0.35；p = 0.05）；而与最大等长膝关节伸展力量之间存在中度正相关（r = 0.37；p = 0.044）。股内侧肌霍夫曼反射与其他变量之间未发现显著关系。
我们的研究结果为髌股疼痛女性的脊髓兴奋性与最大和次最大等长扭矩产生的神经肌肉控制之间的关系提供了见解。相反，脊髓兴奋性似乎与髌股疼痛女性膝关节伸展的动态扭矩和力矩无关。
