title: Integrated actions of the four heads of quadriceps femoris: an electromyographic study.
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D007717:Knee / Q000502:physiology*; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D011187:Posture; D013997:Time Factors