Ergonomic Analysis of Microlaryngoscopy Using Surface Electromyography

INTRODUCTION Proper ergonomic positioning in the workplace is crucial in preventing musculoskeletal disorders (MSD) resulting from prolonged muscular fatigue. Specifically in microlaryngoscopy, surgeons often disregard proper ergonomic positioning in favor of dexterity and range of motion during surgery, leading to increased muscle fatigue through neck strain and compressive forces [1]. Similar MSDs are the most common reason for premature retirement in comparable medical occupations [2]. It is possible to quantify muscular fatigue that can lead to MSDs using surface electromyography (sEMG). The effects of muscle fatigue, a decrease in the muscle’s ability to generate force, are evident in the myoelectric signal [3]. Both an increase in the amplitude of the sEMG signal, due to recruitment of additional motor units, and a shift towards a lower frequency spectrum, due to a decreased fiber conduction velocity from lactic acid build-up, indicate muscular fatigue [3].