A Comparative Study in Cervical Muscle Activities during Various Resting Postures Using Electromyography

Abstract

Background: Neck and back pain are the most common reported musculoskeletal disorders. Applying surface electromyography to determine muscular activity has been used for a long time for clinical diagnosis. OBJECTIVE: The aim of this study was to assess the effect of two sleeping postures (recommended and preferred postures) on neck muscles activities and fatigue by measuring cervical muscles activities using electromyography. In the recommended posture (Model 1), the cervical and lumbar spine are horizontally aligned, while in the preferred posture (Model 2), the cervical spine is not aligned with lumbar spine. Methods: A total of nine healthy male subjects were asked to side rest with a pillow with adjustable height. The electromyography examinations were performed for upper trapezius (UT) and sternocleidomastoid (SCM) muscles of participants. After acquiring the anthropometric data, participants laid on mattress with medium hardness at the two postures for 30 minutes. Results: Comparison between the two models showed a significant difference ( ) in the level of electrical activity of neck muscles. In addition, a remarkable difference ( ) was observed in terms of neck muscle fatigue between the two tested models. Conclusions: The results indicate that the recommended posture developed and tested in this study would reduce the level of fatigue and activity of neck muscles during resting.

A method for calculating vector forces at human-mattress interface during sleeping positions utilizing image registration

“…), offer a comprehensive approach to analyzing musculoskeletal loads. These techniques provide a convenient tool for studying muscle and joint loads in the human body by establishing a human–environment mechanics simulation model 17 . While multi-rigid-body musculoskeletal modeling techniques have gained widespread use as a practical tool across diverse domains 25 – 27 , their reliability necessitates prior verification 28 – 30 .…”

“…While multi-rigid-body musculoskeletal modeling techniques have gained widespread use as a practical tool across diverse domains 25 – 27 , their reliability necessitates prior verification 28 – 30 . Given that the forces exerted at the human-mattress interface, as a boundary condition input for the sleeping posture model, are primary determinants of the loads on the human skeletal muscle system 14 – 17 , 21 , an efficient, noninvasive, and cost-effective acquisition of vector forces at the human-mattress interface is crucial. This is essential for enhancing the accuracy of inverse dynamic calculation results and expanding the application of modeling and simulation technology in mattress design optimization.…”

Finite element analysis of fibre-reinforced constitutive formulation of Cadisc-L

“…The finite element method is widely used for strain and stress analysis of engineering structures particularly in biomechanics and proved to be very functional for complex models of living tissues structures (Amerian et al, 2014;Bahraseman et al, 2013Bahraseman et al, , 2014aBahraseman et al, , 2014bBahraseman et al, , 2015Bahraseman et al, & 2016Dietrich et al, 1991;Kedzior et al, 1996;Khosravi et al, 2014aKhosravi et al, & 2014bPoor et al, 2017;Sabooni et al, 2015;Skalli, 1999;Zienkiewicz & Taylor, 1991). These computational tools provide assistance for a better interpretation of clinical and experimental data to improve the prosthesis design.…”