Applied anatomy and kinesiology; the mechanism of muscular movement . arm to complete the move-ment. The question as to which stage of the lift is most difficultwiU be answered difiFerently, depending on which muscles are mostfuUy developed—flexors, extensors, or elevators. This analysis ofthe movement may often be seen by obser\ing 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
Applied anatomy and kinesiology; the mechanism of muscular movement . arm to complete the move-ment. The question as to which stage of the lift is most difficultwiU be answered difiFerently, depending on which muscles are mostfuUy developed—flexors, extensors, or elevators. This analysis ofthe movement may often be seen by obser\ing 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 circumstaites require some muscular action. Two muscles,the pectoralis major and latissimus, join the arm to the trunk; theweight of the bod^ is partly borne by these and partly by the musclesjoining the humerus to the scapula and those that join the scapulato the trunk. Of dl these the two pectorals and the lower fibers. Fig. 77.—Chinning the bar Fig. -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 FOREiRM Chinning the Bar.—When a person who is hangiig by his handstries to Hft 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 tfst 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 beiig co
Size: 1491px × 1676px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksu, booksubjectphysicaleducationandtraining
