title: An electromyographic study of four abdominal exercises.
mesh_terms: D000009:Abdominal Muscles / Q000502:physiology*; D000200:Action Potentials; D000328:Adult; D000704:Analysis of Variance; D004576:Electromyography; D006801:Humans; D008297:Male; D005082:Physical Exertion; D013178:Sports Medicine