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The influence of target size and wei...

New York University., Program in Environmental Health Sciences.

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The influence of target size and weight on trunk muscle recruitment in different lifting speeds.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The influence of target size and weight on trunk muscle recruitment in different lifting speeds./
Author:	Yoon, Jangwhon.
Description:	292 p.
Notes:	Advisers: Ali Sheikhzadeh; Margareta Nordin.
Contained By:	Dissertation Abstracts International69-09B.
Subject:	Health Sciences, Occupational Health and Safety. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3320919
ISBN:	9780549749301

The influence of target size and weight on trunk muscle recruitment in different lifting speeds.
Yoon, Jangwhon.

The influence of target size and weight on trunk muscle recruitment in different lifting speeds. - 292 p.

Advisers: Ali Sheikhzadeh; Margareta Nordin.

Thesis (Ph.D.)--New York University, 2008.

Introduction. Significant variability in spinal load during lifting trials under identical conditions cannot be explained by a traditional lifting injury model. In addition to the environmental factors, such as weight and distance, the operational factors, such as lifting speed, need to be considered. Few studies have examined the lifting speed and its function on biomechanical demand. The aim of this study were: (1) to test the speed-accuracy trade-off phenomenon in the manual lifting; and (2) to investigate the effect of weight and precision demand at the lifting destination on selected trunk muscles at varied lifting speed.

ISBN: 9780549749301Subjects--Topical Terms:

1017799
Health Sciences, Occupational Health and Safety.

The influence of target size and weight on trunk muscle recruitment in different lifting speeds.
LDR:03460nmm 2200361 a 45 001 890539
005 20101103
008 101103s2008 eng d
020 $a 9780549749301
035 $a (UMI)AAI3320919
035 $a AAI3320919
040 $a UMI $c UMI
100 1 $a Yoon, Jangwhon. $3 1064487
245 1 4 $a The influence of target size and weight on trunk muscle recruitment in different lifting speeds.
300 $a 292 p.
500 $a Advisers: Ali Sheikhzadeh; Margareta Nordin.
500 $a Source: Dissertation Abstracts International, Volume: 69-09, Section: B, page: 5331.
502 $a Thesis (Ph.D.)--New York University, 2008.
520 $a Introduction. Significant variability in spinal load during lifting trials under identical conditions cannot be explained by a traditional lifting injury model. In addition to the environmental factors, such as weight and distance, the operational factors, such as lifting speed, need to be considered. Few studies have examined the lifting speed and its function on biomechanical demand. The aim of this study were: (1) to test the speed-accuracy trade-off phenomenon in the manual lifting; and (2) to investigate the effect of weight and precision demand at the lifting destination on selected trunk muscles at varied lifting speed.
520 $a Methods. Thirty nine healthy participants performed a total of 24 lifts (3 lifting trials per condition, 2 target sizes, 2 box weights, and 2 requested paces), from waist to shoulder level. Kinematical data of trunk, upper arm, forearm and the box and electromyography (EMG) of nine muscles were collected. Based on kinematical data, phases of lifting were defined and EMG data were analyzed for each phase. The effect of lifting pace, box weight and target size on lifting velocity, box control, upper body kinematics, and other lifting related outcome variables was analyzed using repeated-measures MANOVA.
520 $a Results. Both mean and peak velocity of the box significantly (p<0.001) affected by lifting pace, box weight, and target size but there were significant interactions. The temporal recruitment pattern of trunk muscles was significantly affected by lifting velocity. The recruitment of Lumbar Erector Spinae (LES) increased significantly at the beginning phase of faster lifts. The proportion of variance in the LES, explained by the lifting duration, was greater than that by weight or target size.
520 $a Conclusions. The Fitts' speed-accuracy trade-off was not applicable to the manual lifting in this study. The temporal recruitment pattern of the trunk muscles and the consequential mechanical demands on the lumbar spine can be independently influenced by the lifting velocity and by the weight of the load. This suggests that different motor strategies may be endorsed for different lifting conditions. These findings underscore the importance of proper lifting technique and the training programs beyond optimizing the environmental conditions for lifting.
590 $a School code: 0146.
650 4 $a Health Sciences, Occupational Health and Safety. $3 1017799
650 4 $a Health Sciences, Rehabilitation and Therapy. $3 1017926
690 $a 0354
690 $a 0382
710 2 0 $a New York University. $b Program in Environmental Health Sciences. $3 1025247
773 0 $t Dissertation Abstracts International $g 69-09B.
790 $a 0146
790 1 0 $a Halpern, Manny $e committee member
790 1 0 $a McDonough, Andrew L. $e committee member
790 1 0 $a Nordin, Margareta, $e advisor
790 1 0 $a Scott, Marc $e committee member
790 1 0 $a Sheikhzadeh, Ali, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3320919