The Effects of Carrying a Single-Strap Bag Positioned Differently on Peak Vertical Ground Reaction Forces and Postural Stability: a Pilot Study

Aim: Single-strap bags cause asymmetric load-carrying and postural asymmetry. This study aimed to investigate the effects of a single-strap bag on peak vertical ground reaction forces (PVGRFs) and on postural stability when it is worn in different positions. Methods: 6 volunteer women were assessed in the Human Movement Laboratory. Force platforms were used to measure both the ground reaction forces (GRFs) during gait cycle and postural sways during a standing task. All of the measures were taken without bag, with bag on shoulder, and with bag on forearm. Results: Bag carriage on the forearm increased postural sway (p<0.05). However, not significant changes were found in PVGRFs. Conclusion: Single-strap bag usage on the forearm negatively affects women`s balance. Corresponding author: Zehra Guchan Mailing Address: Eastern Mediterranean University, Magusa, Cyprus E-mail: [email protected] Tel No: (0090) 542 873 3677 Introduction There are numerous studies researching the effects of backpack carriage on the body in both static and dynamic conditions (1-4). The backpack is commonly worn in the daily life of children and young adults, whereas the majority of adults prefer to use other types of bags (5). A single-strap bag carriage is popular among women (1). It causes asymmetrical loading and postural compensation (1,6). These problems increase shearing forces at the joints and compressive forces produced by muscles (1). Moreover, while walking, the pattern