. Applied anatomy and kinesiology. Fig. 155 Fig. 156 Figs. 155 and 156.—Action of trunk and limbs in raising arms forward. InFig. 155 the extensors of trunk, hips and ankles are working; in Fig. 156 the balanceis shifted to lessen their work. ment. Here it is the muscles of the opposite side of the trunk thatact—erector spinse, quadratus lumborum, internal and externaloblique—and if the resistance is considerable, the rectus the resistance to raising one arm is great and the arm islifted with force the extensors of hip, knee and ankle of the liftingside also show increased contr
. Applied anatomy and kinesiology. Fig. 155 Fig. 156 Figs. 155 and 156.—Action of trunk and limbs in raising arms forward. InFig. 155 the extensors of trunk, hips and ankles are working; in Fig. 156 the balanceis shifted to lessen their work. ment. Here it is the muscles of the opposite side of the trunk thatact—erector spinse, quadratus lumborum, internal and externaloblique—and if the resistance is considerable, the rectus the resistance to raising one arm is great and the arm islifted with force the extensors of hip, knee and ankle of the liftingside also show increased contraction. When one arm is raised at any other angle than forward or side- 262 GYMNASTIC MOVEMENTS ward the trunk muscles also contract and it is always those on theopposite side of the spinal column from the arm that act—erectorspina? when it is forward, lateral group when it is sideward, abdom-inal group when it is backward, and opposite intervening groups atany angle between. When the arm bearing a weight is raised slowly
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