A Feasibility Study On The Recruiting Response Law Based On Needle Electrode Electromyography In The Anti-gravity Work Of The Deep Cervical Muscles

Purpose:1.To explore the feasibility of using ultrasound-guided needle electromyography for the study of recruitment response in the work of cervical deep muscle against gravity,to provide a new evaluation method for cervical muscle tension,and to provide new ideas for the study of chronic neck pain.2.To explore the differences of different deep cervical muscles’ recruitment responses in the anti-gravity work,to analyze the contribution of different muscles to the maintenance of flexion-neck posture,and to find the primary responsible muscle that may cause chronic neck pain in muscle tension.Materials and Methods:Recruiting 24 healthy adult subjects,using needle electrode electromyography to detect the EMG waveforms of musculi splenius capitis,musculi semispinalis capitis,semispinalis cervicis,longissimus capitis and musculi levator scapulae under the condition of prone position,the head and neck protruding out the beding of the bed edge and wearing the 10 kg dumbbell.Using SPSS software,independent samples rank sum test was used to compare the initial recruitment response types of each group of muscles,and spearman grade correlation analysis was used for the correlation between the initial recruitment response types of each group of muscles and the maximum duration of the recruitment response.Results:1.According to the rank sum test of the initial recruitment response type of all the five groups of subjects,there was a significant difference in the initial recruitment response type between musculi semispinalis capitis and the other four groups of muscles(P <0.05),but the difference between the other four groups of muscles was not significant(P >0.05).2.From the analysis of spearman grade correlation between the initial recruitment response type and the maximum duration of recruitment response in all the five groups of subjects,musculi semispinalis capitis possess the greatest correlation between the initial recruitment response type and the duration of recruitment response(rs =-0.690),semispinalis cervicis lower than it(rs =-0.535),longissimus capitis is the lowest(rs =-0.416),and no correlation in musculi splenius capitis and musculi levator scapulae(p >0.05).Conclusion:1.With the guidance of ultrasound,it is feasible to study the recruitment response of deep posterior cervical muscles during gravity resistance.It can be used as a new evaluation method for neck muscle tension.2.In physiological conditions,the musculi semispinalis capitis has the greatest contribution to the process of resisting gravity to do work in the neck,and has the greatest influence on the attenuation time of the overall muscle strength of the neck,which proves that it plays a major role in maintaining the flexion position and resisting the head gravity.