title: Task difficulty and the efficiency of muscular activity.
mesh_terms: D000328:Adult; D001132:Arm; D001290:Attitude; D004526:Efficiency; D004576:Electromyography; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D013647:Task Performance and Analysis