Trapezius vs Thoracic Wall Muscle Activity Waveforms - EMG & Respiratory Signals #1646404 (License: Personal Use)

The upper waveform displays high-amplitude, discrete bursts characteristic of trapezius muscle electromyography (EMG) during active shoulder elevation or scapular stabilization. The lower waveform shows a continuous, low-amplitude, periodic pattern reflecting diaphragmatic and intercostal activity during quiet respiration-typical of thoracic wall surface recordings. Both signals are time-aligned to illustrate functional dissociation between postural/upper limb motor control and respiratory mechanics.

Used in physiotherapy, kinesiology, and biomedical engineering contexts to differentiate neuromuscular activation patterns; supports diagnosis of dyspnea, muscle fatigue, or compensatory movement strategies in rehabilitation settings.