Muscular endurance and electromyographic fatigue in myofascial shoulder pain.

摘要: An endurance test in shoulder flexion was made 10 patients (median age 30 yr) with a history of shoulder-neck pain at least one year's duration. No signs inflammatory, rheumatic, or neuromuscular diseases were present among the but there localized muscular and tenderness region. In sitting position performed an degree isometric on both left right sides. EMG recorded from descending part trapezius muscle by surface electrodes supraspinatus intramuscular wire electrodes. Myoelectric amplitude increase mean power frequency (MPF) decrease time during used as measures fatigue development. All had shorter duration more painful side. The short relation to load. regression between MPF similar that for healthy subjects. appears be effect increased physiologic fatigability which may due change its work capacity.