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Motor strategies in lifting movements: A comparison of adult and children performance

Gachoud, Jean-Pierre
Published in Journal of Motor Behavior. 1983, vol. 15, no. 3, p. 202-216
Abstract The experiment compares the performances of children six to nine years old and adults in a simple, monoarticular lifting task. Overt behaviors, as described by the kinematic features of the movement, do not differ qualitatively in the two groups. The patterns of motor commands, as expressed by the electromyographic recordings, are however strikingly different. Adults plan the movement with a careful balance between agonist muscle activity and passive viscoelastic forces, whereas children use both agonist and antagonist active forces. It is argued that the motor strategy adopted by adults depends upon an internal representation of the properties of the motor system and of the size/weight covariation in natural objects, and that this representation is not yet fully developed at nine years of age.
Keywords Lifting objectsMono-articular movementConstrained amplitudeObjects increasing in weight and sizeConstant force strategyConstant acceleration strategyChildren from 6 to 9 years of age
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GACHOUD, Jean-Pierre et al. Motor strategies in lifting movements: A comparison of adult and children performance. In: Journal of Motor Behavior, 1983, vol. 15, n° 3, p. 202-216. doi: 10.1080/00222895.1983.10735297 https://archive-ouverte.unige.ch/unige:21542

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Deposited on : 2012-06-08

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