Prediction of Scapular Dyskinesis Through Electromyographic Indices of Scapulothoracic Muscles in Female Overhead Athletes

Leila Ghanbari, Mohammadhossein Alizadeh, Hooman Minoonejad, Seyed Hossein Hosseini

Abstract


Background: Shoulder joint function and the athletic performance of overhead
athletes are influenced by scapular dyskinesis (SD) due to its high prevalence
among these athletes and the motor interaction between the scapula and the arm.
The present study investigated the prediction of SD through the electromyographic
indices of scapulothoracic muscles in female overhead athletes.
Methods: The present descriptive-correlational study was carried out on 60
female volleyball, handball, basketball, and badminton athletes. The lateral
scapular slide test was used to examine their SD. The required electromyography
and electrogoniometry data was recorded simultaneously to measure the activity
and onset time of scapulothoracic muscles, including upper trapezius (UT),
lower trapezius (LT), and serratus anterior (SA). The collected data was analyzed
using Spearman correlation and multiple regression tests.
Results: Significant correlations were found between all electromyographic
variables and SD (P<0.01). The regression effects of all predictive variables on SD
were significant (P=0.001). In terms of predictive power, UT/SA co-contraction
(β=0.765), UT/LT co-contraction (β=0.716), LT onset time (β=0.672), LT activity
(β=0.612), and SA onset time (β=0.576) had the highest regression effects on
SD, respectively. The analysis of the study model showed that there was a strong
correlation (r=0.694) between the predictive variables and SD and that the
independent variables predicted 48% of the variance.
Conclusion: The presence of imbalance in the scapulothoracic muscles of
overhead athletes with SD indicates that athletes should be monitored by
coaches, physiotherapists, and physicians for SD screening. It is also necessary
to carry out prospective studies to examine and explore other variables related
to SD.


Keywords


Electromyography, Muscle onset time, Overhead athletes, Scapular dyskinesis, Scapulothoracic muscles

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