Investigation of archery experience on shoulder girdle motion and acromiohumeral distance at full draw: A pilot study

BackgroundArchery experience may impact the acromiohumeral distance (AHD) related to shoulder injuries.ObjectiveTo compare the effect of full draw motion on the acromiohumeral distance in experienced archeries and controls using three-dimensional motion analysis dynamic ultrasonography examination methods.MethodsEight experienced archers (archer group) and 10 non-experienced archers (control group) drew with and without a string. Kinematic data of the scapulothoracic and glenohumeral (GH) joints were collected by an electromagnetic motion tracking device during the drawing motion. A full draw spanned 1000 msec before string release. We measured AHD under three conditions using an ultrasound: standing and both full draw positions. The statistical analysis used a two-way ANOVA with archery experience and conditions (p < 0.05).ResultsThe GH horizontal adduction angles and the AHD at full draws showed an interaction effect (p < 0.05). In the archer group, the AHD increased more in the with- than in the without-string conditions. In the control group, AHD decreased in the with-string condition compared with the without-string. GH joint angles differed in each group, and the increase in the horizontal adduction angle could contribute to AHD decrease.ConclusionsArcher group showed less reduction in shoulder joint horizontal abduction angle by string tension than the control group, and no reduction in AHD was observed.