A biomechanical monitoring framework for supine sleep: continuous muscle state assessment using sEMG-JASA synchronized with interface pressure mapping

< 0.01). Reduced interface pressure in partially suspended body regions appears to elicit compensatory muscle activation, leading to fatigue accumulation. The JASA method effectively discriminates muscle states during prolonged supine posture, providing a biomechanical basis for real-time, pressure-modulating interventions aimed at improving sleep recovery and comfort.