459 EP021 – Study on electromyographic characteristics of neck muscles in college students with chronic neck pain

Background The prevalence of CNP increases year by year, affecting the life and work of its patients. At present, there is little comparative analysis of static and dynamic electromyography (EMG) of neck extensor muscles at home and abroad. Objectives To provide reference for the evaluation and diagnosis of chronic neck pain (CNP) syndrome. Methods 22 patients with CNP and 22 healthy people were recruited, who were all college students. The subjects' neck extensor muscle strength in head neutral position, natural anteversion position and maximum forward flexion position was measured by a tester for isometric muscle strength respectively. The static electromyography (EMG) of the subjects' splenius capitis muscles and upper trapezius muscles was detected by a surface EMG device during isometric contractions of muscles, and the dynamic EMG of the subjects' splenius capitis muscles and upper trapezius muscles was detected during head and neck flexion and extension. Neck extensor muscle strength, average electromyography (AEMG), integral electromyography (iEMG), rate of EMG contribution and flexion extension ratio (FER) in patients and healthy subjects were compared to find out electromyographic characteristics of neck muscles in college students with CNP. Conclusions (1) Both neck extensor muscle strength and EMG level of college students with CNP were significantly lower than those of healthy college students. (2) Both splenius capitis muscles and trapezius muscles of college students with CNP had functional damage, and the functional damage of the former was severer. (3) During head and neck flexion and extension, FER of neck extensor muscle EMG in college students with CNP significantly increased, indicating that the active activity functions of neck extensor muscles of college students with CNP were insufficient and the flexion-relaxation responses were weakened.