File:Applied anatomy and kinesiology (1917) (14764332061).jpg

Identifier: appliedanatomyki01bowe (find matches)
Title: Applied anatomy and kinesiology
Year: 1917 (1910s)
Authors: Bowen, Wilbur P. (from old catalog)
Subjects:
Publisher: (n.p.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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t extended farto left to balance the extreme lateral flexion. As the arm is extended diagonally upward in putting the shot theabductors of the scapula pull the shoulder forward, the crosswisedirection in which the movement starts being favorable to bestcontraction and leverage of the pectoralis major. At the same timethe oblique muscles and rotators of the hip-joints turn the shoul-ders strongly to left, aided by a violent (lo^^ Il\^ard and backwardswing of the left arm, and the extensors of the s))ine and limbs 286 PLAYS, GAMES AND SPORTS project the whole body forward and upward. The left limb swingsbackward to reinforce the rotation, prevent too much forwardmovement and give balance on alighting. At the finish the del-toid, lower serratus and left erector spinse are doing the most workin place of the pectoral, upper serratus and right erector spinse,which were in a position to do most at the beginning. The postureis now so far forward that the left arm and leg are needed far to the
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Fig. 176 rear to prevent falling forward or stepping out of the circle, theextensors of spine and limbs continuing in action to recover erectposition. As the feet strike the ground in alighting the balance isapt to be so far forward that the extensors of trunk and right limbmust relax to a certain degree, using a lengthening contraction ofthe muscles until the centre of gravity of the body is broughtwithin the base. Notice that while the muscles used in throwing PLAYS, GAMES AND SPORTS 287 and putting the shot are almost the same the coordination is alto-gether different, the one putting emphasis on rotation and theother on extension; the first aiming to give a light object maximumspeed, the other aiming to exert most force in the right directionagainst a heavy weight; the first emphasizing accuracy and theother neglecting accuracy for power and speed. Throwing the hammer, like the use of the sling by the ancients,utilizes centrifugal force to a greater extent than other forms ofthrow

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