Clinical Study Of Forward Head Posture Based On Surface Electromyography

Objective Forward head posture(FHP)is a kind of common bad posture,which will affect the activities of daily life,usually accompanied by neck,shoulder and back pain,cause a series of musculoskeletal diseases.This study focuses on this poor posture of FHP,analyze the correlation between Head forward angle and subjective and objective evaluation indicators,and uses surface electromyography to quantify the fatigue of UT and SCM,and evaluates the impact of FHP on cervical spine function in various aspects objectively,provide some reference values for the evaluation of FHP population,and make pre-judgments,provide further reference for the evaluation of FHP population,it also provides a basis for further targeted rehabilitation treatment and maintaining a good posture.Methods The study participants were all 28 volunteers recruited from the rehabilitation department of HwaMei Hospital,University of Chinese Academy of Sciences.The right side image of the subjects was collected to measure the craniovertebral angle(CVA),which is the angle formed by the connection between the 7th cervical spinous process and the tragus and the horizontal line passing through the 7th cervical spine;the subjects with an angle less than 53° were divided into FHP group,and the rest were included in the control group.Both groups were assessed including Pain assessment,NDI,McGill Pain questionnaire,lifestyle related questionnaire,ROM(including flexion,extension,left flexion,right flexion,left rotation,right rotation),and RMS and MF in sEMG of UT and SCM when neck rest,different directions(flexion,extension,left flexion,right flexion,left rotation,right rotation)and MVIC.Correlation analysis of CVA with ROM,NDI,McGill and sEMG value,and comparison of differences between groups.Results 1.ROM:in FHP group,the left flexion angle(26.63°±5.71°)was smaller than that in control group(31.83±3.69°),and the right flexion angle(26.50±5.25 °)was smaller than that in control group(31.67°±3.68°),the difference was statistically significant(P<0.05).To compare the flexion angle(43.38°±6.72°),extension angle(50.13°± 9.67°),left rotation angle(68.75°± 5.67°)and right rotation angle(68.25°±7.92°)of the FHP group to the flexion angle(45.58°±8.49°),extension angle(54.00°±7.52°),left rotation angle(67.33°±7.61°)and right rotation angle(68.58°±5.03 °)of the control group,there was no significant difference(P>0.05).2.RMS and MF in sEMG of UT and SCM:(1)The RMS value of left UT(6.64±3.62)μV and right UT(6.59±4.26)μV in FHP group were higher than that of left UT(3.81±1.34)μV and right UT(3.64 ±1.66)μV in control group respectively,and the RMS value of left UT(8.60±7.20)μV was higher than that of left UT in control group(4.07±1.67)μV of left neck flexion,the difference was statistically significant(P<0.05).(2)The RMS value of left SCM when flexing the left side of the neck in FHP group(27.67±19.54)μV was higher than that of left SCM in control group(15.48± 7.81)μV and the RMS value of right SCM in FHP group(32.20± 30.93)μV was higher than that of right SCM in control group(13.32±7.96)μV when flexing the right side,and When the neck is rotated left,the RMS value of the left SCM(12.77±5.76)μV was higher than that in the control group(6.65±6.01)μV,the RMS value of the right SCM(45.90±39.32)μ V was higher than that of the control group(22.49 ± 14.66)μV,and the RMS value(42.12±22.29)μV of the left SCM in the right rotation was higher than that in the control group(24.95±15.68)μV,the difference was statistically significant(P<0.05).(3)The MF value of right SCM in FHP group was lower than that in control group(84.78±13.59)Hz.The MF value of right SCM in MVIC of SCM was lower than that in control group(81.60 ±11.94)Hz,the difference was statistically significant(P<0.05).3.NDI:the NDI of FHP group(5.06 ±2.86)points was slightly higher than that of control group(3.58± 1.93)points,but the difference was not statistically significant(P>0.05).4.Simplified McGill pain assessment:the McGill pain score of FHP group(3.63±6.53)points was slightly higher than that of the control group(1.25±1.71)points,but the difference was not statistically significant(P>0.05).5.Correlation analysis:(1)CVA has a negative correlation with the RMS value of bilateral SCM when the right flexion and right rotation of the neck(r=-0.477,r=-0.535,r=-0.417,r=-0.418,P<0.05),CVA was positively correlated with the MF value of the right UT during the MVIC of the UT(r=0.464,P<0.05),CVA was positively correlated with the MF value of the left SCM when the flexion was left(r=0.452,P<0.05),and CVA was positively correlated with the MF value of the right SCM was positively correlated with the right flexion(r=0.472,P<0.05).(2)CVA was positively correlated with left flexion angle(r=0.380,P<0.05),and there was no significant correlation between CVA and activity in other directions.Conclusion 1.Cervical lateral flexion was limited in FHP patients.2.In patients with FHP,the RMS of bilateral UT is enhanced when the neck is extended,and the RMS of the SCM was increased on the contraction side during lateral flexion and rotation,suggesting that muscle activity was reduced and easily over-activated,prompt the right SCM muscle fatigue 3.FHP was not significantly associated with neck pain and NDI.4.CVA has a strong correlation with the left flexion angle of the cervical spine,the myoelectric activity of UT and SCM on the contraction side when the neck is active.