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Control and dynamics during angular ...

Mathiyakom, Witaya.

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Control and dynamics during angular impulse generation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Control and dynamics during angular impulse generation./
作者:	Mathiyakom, Witaya.
面頁冊數:	188 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3341.
Contained By:	Dissertation Abstracts International65-07B.
標題:	Biophysics, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3140515
ISBN:	0496876562

Control and dynamics during angular impulse generation.
Mathiyakom, Witaya.

Control and dynamics during angular impulse generation. - 188 p.

Source: Dissertation Abstracts International, Volume: 65-07, Section: B, page: 3341.

Thesis (Ph.D.)--University of Southern California, 2004.

Generation of angular impulse during goal directed tasks requires control of the center of mass (CM) relative to the reaction force so that linear and angular related task objectives at take-off are satisfied. The magnitude and direction of the angular impulse is dependent upon the reaction force, CM position relative to the center of pressure, and the relative angle between the reaction force and CM position vectors. This study determined how control and dynamics during angular impulse generation is coordinated to accommodate competing task objectives. Task differences in horizontal CM velocity at touchdown and departure were hypothesized to influence (1) the role of the legs and trunk in controlling the CM trajectory, (2) the mechanism of reaction force generation, and (3) the control of the relative angle between the CM and the reaction force. This hypothesis was tested by comparing angular impulse generation during three sets of practiced goal-directed tasks done by skilled performers: translating backward with and without backward rotation (back somersaults and back timers), translating forward with and without backward rotation (reverse somersaults and reverse timers), and initiated with and without horizontal velocity at touchdown (standing and running front somersaults). Control and dynamics of the musculoskeletal system were analyzed at the total body, trunk-leg, joint/segment, and muscle levels by quantifying and comparing kinematics, reaction forces and muscle activation patterns. Between task differences in horizontal momentum requirements induced between task differences in mechanisms used to generate reaction forces and control CM trajectory during the take-off phase. The reaction force was mediated by the legs and the CM trajectory was controlled via trunk motion. During backward rotating tasks, the relative angle between the CM and reaction force was regulated by trunk motion when translating backward and by the reaction force when translating forward. During forward rotating tasks, the orientation of the reaction force relative to the CM was mediated by the leg angle at touchdown when initiating the task with horizontal velocity and the trunk angle when initiating the task from rest. Accommodating for between task differences was achieved by altering trunk-leg coordination and subsystem control.

ISBN: 0496876562Subjects--Topical Terms:

1019105
Biophysics, General.

Control and dynamics during angular impulse generation.
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520 $a Generation of angular impulse during goal directed tasks requires control of the center of mass (CM) relative to the reaction force so that linear and angular related task objectives at take-off are satisfied. The magnitude and direction of the angular impulse is dependent upon the reaction force, CM position relative to the center of pressure, and the relative angle between the reaction force and CM position vectors. This study determined how control and dynamics during angular impulse generation is coordinated to accommodate competing task objectives. Task differences in horizontal CM velocity at touchdown and departure were hypothesized to influence (1) the role of the legs and trunk in controlling the CM trajectory, (2) the mechanism of reaction force generation, and (3) the control of the relative angle between the CM and the reaction force. This hypothesis was tested by comparing angular impulse generation during three sets of practiced goal-directed tasks done by skilled performers: translating backward with and without backward rotation (back somersaults and back timers), translating forward with and without backward rotation (reverse somersaults and reverse timers), and initiated with and without horizontal velocity at touchdown (standing and running front somersaults). Control and dynamics of the musculoskeletal system were analyzed at the total body, trunk-leg, joint/segment, and muscle levels by quantifying and comparing kinematics, reaction forces and muscle activation patterns. Between task differences in horizontal momentum requirements induced between task differences in mechanisms used to generate reaction forces and control CM trajectory during the take-off phase. The reaction force was mediated by the legs and the CM trajectory was controlled via trunk motion. During backward rotating tasks, the relative angle between the CM and reaction force was regulated by trunk motion when translating backward and by the reaction force when translating forward. During forward rotating tasks, the orientation of the reaction force relative to the CM was mediated by the leg angle at touchdown when initiating the task with horizontal velocity and the trunk angle when initiating the task from rest. Accommodating for between task differences was achieved by altering trunk-leg coordination and subsystem control.
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