title: Positive work and its efficiency are at their dead-end: comments on a recent discussion.
authors.forename: G J
authors.initials: GJ
authors.lastname: van Ingen Schenau
mesh_terms: D001132:Arm / Q000502:physiology*; D001696:Biomechanical Phenomena; D003446:Crutches; D004550:Elbow; D004734:Energy Metabolism / Q000502:physiology*; D005684:Gait / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D009132:Muscles / Q000502:physiology*