Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898. Excerpt: ... diers and athletes. Bierent1 has developed this law, and the facts these tables express are in agreement with his conclusions. The literature of strength--increases after seventeen years, with which we shall not deal--is very voluminous. The investigations which have been made indicate conclusively that growth in this direction is by no means at maturity at the age mentioned. The English Anthropometric Committee concludes that the increase is rapid, and then more slowly until 30 years, after which it tends to decline with an increasing rate.2 He finds a parallelism between the increases of weight and strength. Precision of Hand Movements. Superficial investigation shows that the nervous mechanism involved in the attempts to be precise with the finger, require first an adjustment of a larger area of muscular and nervous tissues than those of any other movement of the body probably. Precision in drawing a fine line accurately, for example, requires steadiness not only of the finger movement itself, but of the hand, the whole arm, and even of the body. If we observe a child learning to write we find that he holds his breath, and in many cases his legs will be found bracing his body in intense strain. The central muscles of the arm and trunk are called into activity to give support of steadiness as a necessary condition for the fine adjustment to follow.8 We may, therefore, perhaps consider precision as involving two processes: ( 1 ) that of steadiness of the central organization as a platform upon which rests (2) the finer nervous adjustments of the most complex nervous elements. i. Central Steadiness. This phase of the problem has been subjected to investigation by Hancock4 in the effort of children to stand still. The subject was asked to stand with feet c...
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