Comparison the Electromyographic Activity Timing of Scapular Stabilizer Muscles in Arm Abduction, Flexion, and Scaption Motor Planes in Men with Upper Crossed Syndrome Abnormalities and Healthy

Abstract

Introduction and Aim: Crossed syndrome is a postural dysfunction pattern to describe the muscles of the shoulder girdle or thoracic-cervical region of the body. As a result, the present research wa conducted with the aim of comparison the electromyographic activity timing of scapular stabilizer muscles in arm abduction, flexion, and scaption motor planes in men with upper crossed syndrome abnormalities and healthy.

Methodology: This research was a causal-comparative. The population of the present research included non-athletic male students aged 18 to 28 years at the University of Tehran. The sample of this study included 44 people in two groups of men with upper crossed syndrome abnormalities and healthy (22 people in each group) who based on the inclusion criteria were selected by purposive sampling. In this research to collect data were used instruments such as scales, height gauges, checkerboard, flexible ruler, scoliometer, digital camera and tripod, metronome, electromyography device, and electrodes. After the initial assessment and screening session, electromyography assessments were performed using a 16-channel device, model ME6000, manufactured by Mega Electronics Company. To analyze the data of the present study was used the independent t-test in SPSS version 26 software.

Findings: The results of this study indicated that there was no significant difference between men with upper crossed syndrome abnormalities and healthy in terms of age, height, and weight (P>0.05), but there was a significant difference between them in terms of head forward, shoulder forward, and dorsal hyperkyphosis (P<0.001). Also, the activity timing of the middle and lower trapezius muscles of men with upper crossed syndrome abnormalities compared to healthy was delayed in all three abduction, flexion, and scaption motor planes (P<0.05), but there was no significant difference between them in terms of the activity timing of the upper trapezius muscle and anterior dentate muscle in all three motor planes (P>0.05).

Conclusion: According to the results of the present study, there is a need to use corrective exercise movements to accelerate the activity of the middle and lower trapezius muscles in men with upper crossed syndrome abnormalities in all three abduction, flexion, and scaption motor planes.