Correlation between architectural variables and torque in the erector spinae muscle during maximal isometric contraction

Abstract

This study analysed whether a significant relationship exists between the torque and muscle thickness and pennation angle of the erector spinae muscle during a maximal isometric lumbar extension with the lumbar spine in neutral position. This was a cross-sectional study in which 46 healthy adults performed three repetitions for 5 s of maximal isometric lumbar extension with rests of 90 s. During the lumbar extensions, bilateral ultrasound images of the erector spinae muscle (to measure pennation angle and muscle thickness) and torque were acquired. Reliability test analysis calculating the internal consistency (Cronbach's alpha) of the measure, correlation between pennation angle, muscle thickness and torque extensions were examined. Through a linear regression the contribution of each independent variable (muscle thickness and pennation angle) to the variation of the dependent variable (torque) was calculated. The results of the reliability test were: 0.976-0.979 (pennation angle), 0.980-0.980 (muscle thickness) and 0.994 (torque). The results show that pennation angle and muscle thickness were significantly related to each other with a range between 0.295 and 0.762. In addition, multiple regression analysis showed that the two variables considered in this study explained 68% of the variance in the torque. Pennation angle and muscle thickness have a moderate impact on the variance exerted on the torque during a maximal isometric lumbar extension with the lumbar spine in neutral position.

Localized Electrical Impedance Myography of the Biceps Brachii Muscle during Different Levels of Isometric Contraction and Fatigue

“…Despite this, few EIM studies have investigated the changes in muscle impedance during a contraction. It is well known that the architecture and fiber geometry of the muscle changes during contraction [ 8 , 9 ]. Muscle imaging studies have proven that the pennation angle and muscle thickness changes during isometric contraction [ 10 , 11 ].…”

Factors of Muscle Quality and Determinants of Muscle Strength: A Systematic Literature Review

“…In a study by Trezise et al [ 44 ] θf of the middle vastus lateralis muscle was found to be a predictor of isometric knee extension (R 2 = 0.72), while θf of the proximal vastus lateralis was a predictor of concentric knee extension (R 2 = 0.65). Cuesta-Vargas & Gonzalez-Sanchez [ 46 ] found the θf of the left-side of the erector spinae to be a predictor of isometric trunk extension (R 2 = 0.680, standardized β = 0.443, p = 0.025). Right side θf of the erector spinae was not found to be a significant predictor of isometric trunk extension MVC [ 46 ].…”

Foot Dorsiflexion Velocity and Torque Variance Explained through Architectural and Electromyography Variables Comparing Elders and Stroke Survivors

“…may be explained by the movement analyzed FD (present study) and plantar flexion, 31 or the type of regression used to analyze the relationship, as the present study used nonlinear regression (exponential regression), whereas Li et al 30 used linear regression, and only 1 independent variable to try to explain the variance of the dependent variable.…”