Paper Title
Design and Analysis of Wearable Exoskeleton Chair

Abstract
This study presents an innovative wearable chair designed to alleviate fatigue and discomfort associated with prolonged standing and squatting, aiming to improve user productivity and well-being in industrial environments. Unlike most exoskeleton chair designs that omit back support, the proposed model uniquely incorporates a dedicated backrest, along with a light weight portable frame and a height-adjustable seat, enhancing ergonomic performance and user adapt ability. Finite element analysis using Solid Works confirms the structural robustness and safety of the design. The chair also offers a non-invasive intervention for individuals experiencing lower back discomfort or limited mobility, with promising applications in fields such as healthcare, manufacturing, construction, and retail. To assess the design’s impact on muscle fatigue, a quantitative evaluation using surface Electromyography (EMG) was conducted on 21 healthy subjects. Participants engaged in four postural conditions: standing, squatting, wearing the chair without backrest, and wearing the chair with backrest. EMG metrics: Root Mean Square (RMS), Median Frequency (MDF), and Mean Frequency (MNF) were analyzed for the lower erector spine and gastronomies muscles. Results demonstrated a 24.35% reduction in RMS values with backrest support, indicating significantly lower muscle fatigue. Additionally, MNF and MDF values decreased by 11.33% and 14.58%, respectively, underscoring the effectiveness of the backrest in fatigue mitigation. This EMG-driven exoskeleton chair design offers a compelling combination of functionality, comfort, and safety. Keywords – Solid Works, Backrest, EMG Analysis, Muscle Fatigue, Lower Erector Spine, Gastronomies, RMS, Median Frequency, Mean Frequency