title: An electromyographic investigation of the rectus abdominis in abdominal exercises.
mesh_terms: D000009:Abdominal Muscles / Q000502:physiology*; D000200:Action Potentials; D000293:Adolescent; D004576:Electromyography; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D010806:Physical Education and Training; D005082:Physical Exertion