Anatomie appliquée et kinésiologie, le mécanisme du mouvement musculaire . m pour terminer le déplacement. La question de savoir à quel stade de l'ascenseur est le plus difficile sera traitée différemment, selon les muscles qui sont mostpleinement développés — flexeurs, extenseurs ou ascenseurs. Cette analyse du mouvement peut souvent être vue en observant le travail des différents types, tels que le chargement du fer de chemin de fer sur les voitures, le chargement des caisses dans un wagon élevé, le chargement des lignes de réseau sur un train, etc. Suspendu par Les Mains.— Lorsqu'on saisit quelque chose au-dessus de l'hishead et qu'on pend verticalement vers le bas, les flexeurs des mains se délatent les seuls muscles t

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Applied anatomy and kinesiology, the mechanism of muscular movement . m to complete the move-ment. The question as to which stage of the lift is most difficultwill be answered differently, depending on which muscles are mostfully developed—flexors, extensors, or elevators. This analysis ofthe movement may often be seen by observing labor of variouskinds, such as loading railroad iron on cars, loading crates into ahigh wagon, loading trunks on a train, etc. Hanging by the Hands.—When one grasps something above hishead and hangs vertically downward, the flexors of the hands arethe only muscles that must act, because the weight of the body GYMNASTIC MOVEMENTS 131 holds the arms and body in the erect position that would under ordi-nary circumstances require some muscular action. Two muscles, the pectoralis major and latissimus, join the arm to the trunk; theweight of the body is partly borne by these and partly by the musclesjoining the humerus to the scapula and those that join the scapulato the trunk. Of all these the two pectorals and the lower fibers. Fig. 77.—Chinning the bar. Cross rest on parallel bars. of the latissimus attach to the ribs, and since most of the weightof parts below is joined to the spinal column rather than to the ribs, hanging by the hands is apt to produce some chest expansion andhence has value as a posture exercise. If the subject, while hang-ing by his hands, can adduct his scapulae by the use of any or allthe muscles on the back of the shoulders, more tension will bethrown on the pectorals and the ribs will be lifted still more. 132 MOVEMENTS OF ELBOW AND FOREARM Chinning the Bar.—When a person who is hanging by his handstries to lift his body with his arms he brings into play the flexorsof the elbow and depressors of the humerus. The exercise, com-monly called chinning the bar, is a popular test of the muscles, a boy of fourteen who can lift himself in this way until he can resthis chin on the bar six times in succession being consid

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