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An Investigation of Factors that Aff...

Lau, Michael H.

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An Investigation of Factors that Affect Subjective Assessment of Wrist Posture and Applied Hand Force.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	An Investigation of Factors that Affect Subjective Assessment of Wrist Posture and Applied Hand Force./
Author:	Lau, Michael H.
Description:	156 p.
Notes:	Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: .
Contained By:	Dissertation Abstracts International72-08B.
Subject:	Health Sciences, Occupational Health and Safety. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3459044
ISBN:	9781124685175

An Investigation of Factors that Affect Subjective Assessment of Wrist Posture and Applied Hand Force.
Lau, Michael H.

An Investigation of Factors that Affect Subjective Assessment of Wrist Posture and Applied Hand Force. - 156 p.

Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: .

Thesis (Ph.D.)--University of Michigan, 2011.

Risk factors of work-related upper-limb musculoskeletal disorders, such as wrist posture and applied hand force, are often assessed using subjective worker and observer ratings. The purpose of this work was to determine accuracy of posture and force exposure estimates based on observer and subject ratings and how accuracy is affected by selected task variables. Specifically, three studies were performed to examine i) the effect of viewing angle on estimation of wrist posture from static images and the relationship to a quantitative model of parallax, ii) the effect of viewing angle and task speed on estimates of peak and average wrist postures from video recordings of tasks, and iii) effects of task orientation on psychophysical ratings of force compared to measured forces.

ISBN: 9781124685175Subjects--Topical Terms:

1017799
Health Sciences, Occupational Health and Safety.

An Investigation of Factors that Affect Subjective Assessment of Wrist Posture and Applied Hand Force.
LDR:03284nam 2200337 4500 001 1405565
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020 $a 9781124685175
035 $a (UMI)AAI3459044
035 $a AAI3459044
040 $a UMI $c UMI
100 1 $a Lau, Michael H. $3 1684953
245 1 3 $a An Investigation of Factors that Affect Subjective Assessment of Wrist Posture and Applied Hand Force.
300 $a 156 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: .
500 $a Adviser: Thomas J. Armstrong.
502 $a Thesis (Ph.D.)--University of Michigan, 2011.
520 $a Risk factors of work-related upper-limb musculoskeletal disorders, such as wrist posture and applied hand force, are often assessed using subjective worker and observer ratings. The purpose of this work was to determine accuracy of posture and force exposure estimates based on observer and subject ratings and how accuracy is affected by selected task variables. Specifically, three studies were performed to examine i) the effect of viewing angle on estimation of wrist posture from static images and the relationship to a quantitative model of parallax, ii) the effect of viewing angle and task speed on estimates of peak and average wrist postures from video recordings of tasks, and iii) effects of task orientation on psychophysical ratings of force compared to measured forces.
520 $a Study 1 showed that viewing angle affects estimates of wrist posture from static images, but with less error than predicted by the parallax model. Raters estimated wrist angles within 15° when the model predicted that all angles from in-line views would appear as 0° or 90°, suggesting that observers also use visual cues from hand and forearm surfaces in addition to spatial relationships.
520 $a Study 2 showed that viewing angle affects wrist posture estimates from video, but effects are complicated by task factors. The largest viewing angles differences were seen for tasks involving either high or low amounts of wrist movement. Mean error ranged from 6--11° and standard deviation, 17--32°, between conditions. The variance due to subject and task were much larger than for viewing angle, indicating a need for better training methods and analysis techniques.
520 $a Study 3 demonstrated that relative perceived force was consistently less than 70% MVE and that task orientation influenced strength, actual exertion force, and perceived difficulty in a similar manner for subjects inserting flexible hoses. Task orientation affected peak insertion force and strength, but the percent capacity used (X¯=66%MVE) and perceptions of exerted force (X¯=4.5/10) were similar across conditions.
520 $a This work shows that observed postures and subject force ratings are influenced by task and methodological factors. Users of these data should be aware of these limitations and factors.
590 $a School code: 0127.
650 4 $a Health Sciences, Occupational Health and Safety. $3 1017799
650 4 $a Engineering, Industrial. $3 626639
650 4 $a Health Sciences, Recreation. $3 1018003
690 $a 0354
690 $a 0546
690 $a 0575
710 2 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 72-08B.
790 1 0 $a Armstrong, Thomas J., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3459044