title: A kinesiologic study of erectores spinae activity during trunk flexion and extension.
mesh_terms: D000328:Adult; D001415:Back / Q000502:physiology*; D004576:Electromyography; D006801:Humans; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D005082:Physical Exertion