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Effects of power generation and two ...

Clowers, Kurt Gavin.

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Effects of power generation and two different landing protocols on evaluating impact attenuation in landing.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of power generation and two different landing protocols on evaluating impact attenuation in landing./
Author:	Clowers, Kurt Gavin.
Description:	272 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5352.
Contained By:	Dissertation Abstracts International66-10B.
Subject:	Health Sciences, Recreation. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3193588
ISBN:	0542378523

Effects of power generation and two different landing protocols on evaluating impact attenuation in landing.
Clowers, Kurt Gavin.

Effects of power generation and two different landing protocols on evaluating impact attenuation in landing. - 272 p.

Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5352.

Thesis (Ph.D.)--The University of Tennessee, 2005.

The purposes of the dissertation were: (1) to examine the effects of power generation and two different landing protocols on the lower extremity during a landing activity, and (2) to examine the effects of power generation and gender on impact attenuation during a landing activity.

ISBN: 0542378523Subjects--Topical Terms:

1018003
Health Sciences, Recreation.

Effects of power generation and two different landing protocols on evaluating impact attenuation in landing.
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100 1 $a Clowers, Kurt Gavin. $3 1906441
245 1 0 $a Effects of power generation and two different landing protocols on evaluating impact attenuation in landing.
300 $a 272 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5352.
500 $a Major Professor: Songning Zhang.
502 $a Thesis (Ph.D.)--The University of Tennessee, 2005.
520 $a The purposes of the dissertation were: (1) to examine the effects of power generation and two different landing protocols on the lower extremity during a landing activity, and (2) to examine the effects of power generation and gender on impact attenuation during a landing activity.
520 $a During the first study, eight elite male recreational athletes and eight non-elite male recreational athletes, selected based upon their maximum jump heights, preformed drop landings in one of six conditions for two different protocols. Each subject landed from a height of 40 cm, 60 cm and 80 cm in the first protocol (PT1) and from a height of 70%, 100%, and 130% of their maximum vertical jump height in the second protocol (PT2). Ground reaction force (GRF) data were recorded using a force plate (OR6-7, AMTI) and kinematic data were recorded using a six camera motion analysis system (Vicon). Both the GRF and kinetic variables were normalized by potential energy. A Group x Protocol x Height mixed design repeated measures ANOVA with Group as the between subject factor was used to test the significance of selected variables. The non-elite athletes landed with a larger loading rate for the second GRF peak and a larger hip extension moment compared to the elite athletes. The non-elite athletes also landed with a greater ankle plantarflexion moment, knee adduction moment and ankle eccentric work in PT1 whereas the elite athletes landed with a smaller ankle plantarflexion moment, knee adduction moment and ankle eccentric work. These findings suggest that the elite athletes were better equipped to absorb the loads at impact and that the two groups of athletes responded differently.
520 $a During the second study, additional sixteen female subjects divided into the non-elite and elite groups preformed drop landings in the same protocols as described in the first study. A Group x Gender x Protocol x Height mixed design repeated measures ANOVA with Group and Gender as the between subject factors was used to test the significance of selected variables. No significant differences between the genders were observed. The elite group proved to land with smaller second GRF peak, greater ankle plantarflexion and knee extension moments compared to the non-elite group in PT1. These results demonstrated that the non-elite and elite athletes used different joint kinetic patterns to dissipate impact loading. Despite no statistical evidence supporting gender differences, females landed with a trend of greater percent increases in the first GRF peak while males landed with a trend of smaller second GRF peak. The elite males showed a decrease in the ankle eccentric work in PT1 compare to PT2. The females showed no change in the ankle eccentric work across the two protocols. These findings demonstrated that the males and females might have used different neuromuscular control of the lower extremity joints to attenuate the forces at impact.
590 $a School code: 0226.
650 4 $a Health Sciences, Recreation. $3 1018003
650 4 $a Biology, Animal Physiology. $3 1017835
690 $a 0575
690 $a 0433
710 2 0 $a The University of Tennessee. $3 1022026
773 0 $t Dissertation Abstracts International $g 66-10B.
790 1 0 $a Zhang, Songning, $e advisor
790 $a 0226
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3193588