June 20 DevSequences - KIN 321M Understanding the...

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11 KIN 321M Understanding the development of locomotor and object control skills Fundamental Motor Skills Period
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22 Developmental Sequences ¡ Developmental sequences describe the  progression of  qualitative   changes that  occur in the performance of a motor skill  as the child works toward a mechanically  optimal execution. 
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33 Types of CHANGE §    Quantitative  change Types of MEASURES §    Product   scores §    Qualitative  change  §   Process   scores
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44 distance thrown AGE ----> form  used for  throwing Quantitative    change Qualitative    change (product score) (process score)
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55 Developmental progression in motor skills:  mastering the mechanical demands v the ability to stabilize a larger proportion of  total body mass v the ability to oppose and, when appropriate,  exploit the forces of gravity v the ability to exploit the passive/reactive  forces associated with movement (Jensen & Bothner, 1998)
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66 - Movements occur in an environment that is  governed by certain principles of motion and  stability. - Certain laws of motion bound or limit our  movements Laws of motion and stability
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77 Moving against gravity: Application of  Force ¡ Application of force over a greater distance l Preparatory positioning l Application of force through a full range of motion ¡ Action-reaction l exploiting the mechanical reactive forces associated with  movement of a linked system ¡ Using the transfer of momentum l extension of the projecting limb (e.g., throwing)
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88 Stability ¡ Related to the ability  to resist movement or  disruption ¡ Base of support l widen the base to  increase stability l narrow the base to  decrease stability
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99 Task appropriate modification of the  base of support ¡ Increasing stability leads to improved  balance, but decreased mobility. ¡ Skilled performers use a base of support  just wide enough to provide sufficient  stability 
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1010 Developmental Sequences ¡ The developmental sequences we will examine  are  descriptions  of movement. ¡ These descriptions do not identify the causes  of the behavioral change from step to step.
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