Correlation between Cranio-Vertebral Angle and Muscle Activity According to Body Movements in Forward Head Posture

The purpose of this study is to determine the correlation between FHP and how it may affect muscle activity during raising the arm and loss of body balance, 40 young people participated. All subjects will have their cranio-vertebral angle (CVA) and muscle activity of the serratus anterior (SA), upper trapezius (UT), and lower trapezius (LT), static balance index, and central pressure excursion index (CPEI) measured. Muscle activity was measured using TeleMyo 2400(Noraxon U.S.A., Inc., Scottsdale, AZ, USA), and static balance indicators and CPEI were measured using the MatscanVersaTek system (Tekscan Inc., MA). Spearman correlation analysis was used to determine the correlation between variables. CVA and SA, UT, and LT all showed significant correlation, positive correlation with SA(r=0.429/p=0.006) and LT(r=0.377/p=0.017), and negative correlation with UT(r=-0.473/p=0.007) (Table 2). CVA showed a moderate level of negative correlation with AREA(r=0.-0.420 /p=0.007) and L-R distance(r=-0.508 /p=0.000) among balance indicators, and did not show a significant correlation with CPEI (Table 3). In people with more severe FHP, SA, and LT muscle activity tended to be lower, UT muscle activity tended to be higher, and static balance ability was lower. According to the results of this study, FHP can have a negative effect on various factors of the body, such as arm movement and static balance, suggesting that establishing correct posture is necessary to prevent secondary physical problems.