Effects of a Wearable Postural Feedback Device on Scapular Muscle Endurance, Trunk Proprioception and Postural Awareness in Sedentary Office Workers: Randomized Controlled Trial

Sedentary behavior and prolonged office work have become increasingly common with the widespread use of computers and desk-based occupations. Prolonged sitting and sustained poor posture are associated with musculoskeletal disorders, particularly forward head posture, rounded shoulders, and increased thoracic kyphosis. These postural alterations may contribute to reduced scapular muscle endurance, impaired trunk proprioception, decreased postural awareness, and altered spinal alignment, ultimately affecting physical function and quality of life.

Wearable postural feedback devices have emerged as a promising strategy for promoting correct posture by providing real-time vibrotactile feedback whenever the user deviates from a predefined neutral posture. Previous studies have demonstrated that these devices may improve postural behavior and increase postural awareness. However, most published studies have been conducted in laboratory settings or have primarily focused on subjective outcomes and short-term postural changes. Evidence regarding their effects on objective neuromuscular outcomes, including scapular muscle endurance, trunk proprioception, and thoracic spinal alignment, in sedentary office workers remains limited.

This study is designed as a single-blind, randomized controlled trial to investigate the effects of a wearable postural feedback device on scapular muscle endurance, trunk proprioception, thoracic kyphosis angle, and postural awareness in sedentary office workers. 64 participants aged 25-45 years will be randomly assigned to either the intervention group or the control group using block randomization. Participants in the intervention group will use the wearable postural feedback device for 12 weeks (5 days per week, 60 minutes per day), while participants in the control group will continue their usual work routine without receiving any intervention.

Outcome measures will be assessed at baseline, immediately after the 12-week intervention, and following a 4-week follow-up period (Week 16). Scapular muscle endurance will be evaluated using the Scapular Muscle Endurance Test, trunk proprioception will be assessed using the Active Trunk Reposition Sense Test with the GYKO inertial sensor, thoracic kyphosis angle will be measured using the Commander® Echo Wireless Inclinometer device, and postural awareness will be assessed using the Postural Awareness Scale.

This study aims to provide high-quality evidence regarding the effectiveness of wearable postural feedback technology in improving neuromuscular function and spinal posture among sedentary office workers. The findings may contribute to the development of evidence-based workplace rehabilitation and ergonomic intervention strategies for the prevention and management of posture-related musculoskeletal disorders.