Applied anatomy and kinesiology, the mechanism of muscular movement . tes practically all of the time, progress beingmade by a sliding motion instead of a flight through the of the nature of the skate and its contact with the ice orfloor the advancing movement is diagonally forward and sideward, sothat the limbs are rotated outward, largely eliminating the extensorsof the ankle from the work. The trunk is held nearly horizontal 312 PLAYS, GAMES AND SPORTS to avoid wind pressure, and this puts the pelvis in good positionfor all the extensors of the hip to act, including the gluteus
Applied anatomy and kinesiology, the mechanism of muscular movement . tes practically all of the time, progress beingmade by a sliding motion instead of a flight through the of the nature of the skate and its contact with the ice orfloor the advancing movement is diagonally forward and sideward, sothat the limbs are rotated outward, largely eliminating the extensorsof the ankle from the work. The trunk is held nearly horizontal 312 PLAYS, GAMES AND SPORTS to avoid wind pressure, and this puts the pelvis in good positionfor all the extensors of the hip to act, including the gluteus maxi-mus. The main work is done by the extensors of the hip and knee,supported by the erector spina?. The extensors of the ankle finishthe stroke and the flexors of the lower limb bring the limb hurdling the runner has to spring up into the air to pass anobstacle at regular distances. He avoids the hurdle by his upwardspring and by the position of the limbs as he passes it. One of hisproblems is to so combine these two movements as to save themost Fig. 189.—Taking the low hurdle. The spring employs the same muscles that are being used in therun, giving a stronger contraction in this particular step. In goingover a hurdle the front limb is held well forward by the flexors ofthe hip and the knee is flexed about to a right angle by relaxationof the extensors, the pull of the hamstrings as the hip is flexedgiving the slight force that is needed. In this position of flexedhip and knee an outward rotation of the hip, produced by the sixoutward rotators, lifts the foot easily and to a sufficient sartorious is peculiarly adapted to help in this combination offlexion and outward rotation of hip and flexion of knee. PLAYS, GAMES AND SPORTS 313 The rear limb is made to avoid the hurdle by holding it far tothe rear and flexing the knee as it passes over the obstacle. This isaccomplished by inclining the body sharply forward to permit thebackward slant of the
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Keywords: ., bookcentury1900, booksu, booksubjectphysicaleducationandtraining
