A Comparison Study on the Electrical Activity of Arm Abduction Muscles During Shoulder Abduction and Scaption Between Shooting Disciplines

Safoura Heshmati,Seyyed Hossein Hosseini,Hassan Daneshmandi

doi:10.32598/biomechanics.5.4.5

Abstract

Objective: Considering the positions that the shooter chooses during shooting in different disciplines, it seems that the activity of deltoid and supraspinatus muscles which are common muscles during movement, varies in different disciplines. Therefore, the purpose of the present study was to evaluate and compare the electrical activity of deltoid and supraspinatus muscles between three shooting disciplines. Methods: 24 shooters (8 archers, 8 air pistol shooters, and 8 air rifle shooters) participated in the study. They performed shoulder abduction and scaption at 60 and 90 degrees. The electrical activity of deltoid and supraspinatus muscles was then recorded using surface electromyography. The data were analyzed by using ANOVA and Tukey’s test at the significance level of P<0.05. Results: The activity of anterior deltoid muscle at 60 and 90 degrees of abduction and the activity of middle deltoid and supraspinatus muscles only at 90 degree of abduction was significantly higher in the archery group than in the air pistol group (P<0.05). Conclusion: The higher electrical activity of deltoid and supraspinatus muscles in archery sport may be related to the tensile force of the bow and the greater arm angle at the shoulder joint during this type of shooting compared to air pistol and air rifle shooting.

Highlights

A thletes in various sports need to perform continuous exercises and strengthen certain muscles of the body to achieve high levels of performance, and have to spend a lot of time training under the predominant physical condition of that sport
The results of this study show that the electrical activity of the anterior deltoid muscle at 60° abduction (P=0.018), 90° abduction (P=0.014) and 90° scaption (P=0.045) was significantly different between the archers and air pistol shooters; at 60° scaption (P=0.58), there was no significant difference between groups (Figure 1)
The results showed that the electrical activity of the anterior deltoid muscle in the abducted position and the activity of the middle deltoid and supraspinatus muscles only in the 90° abducted position were significantly higher in the archery group than in the air pistol group

Summary

Introduction

A thletes in various sports need to perform continuous exercises and strengthen certain muscles of the body to achieve high levels of performance, and have to spend a lot of time training under the predominant physical condition of that sport. As a result, depending on the predominant condition of each sport, the level of muscle activity affecting sports skills is affected [1]. A review of previous studies shows that most researchers have examined shooting disciplines from various other aspects, including posture and postural deformities, musculoskeletal pain, and balance [3-5]. Considering the position that athletes use in different shooting disciplines, it seems that the deltoid and supraspi-. 90 Degree 60 Degree 90 Degree Abduction Scaption Scaption

Methods

Results

Discussion

Conclusion