TY - JOUR
T1 - Angular displacement of torso during lifting
T2 - A system comparison of two measuring methods
AU - Gilad, Issachar
AU - Redfern, Mark S.
AU - Chaffin, Don B.
AU - Byun, Seong N.
N1 - Funding Information:
* This work was partially supported by research gifts from both GenCorp and Owens Coming Fiberglass Corporation. The electron inclinometers were provided by Hoggan Health Industries, Inc. We want to thank Earl Von Woggoner for supplying the first Inclinometers. The Selspot system was provided from NIOSH DSR contract 210-81-3104. The research was conducted at the Center for Ergonomics at The University of Michigan while Prof. Gilad was a visiting professor in the Department of Industry and Operations Engineering. We want to thank Jim Foulke from the Center for Ergonomics at U.M. for his great help in constructing the intrumentation, and Gunnar Andersson for his advice in the biomechanics of lifting.
PY - 1989/12
Y1 - 1989/12
N2 - This paper introduces a study which was conducted to evaluate two different methods used to measure trunk kinematics during a set of controlled lifting tasks. The following two methods were compared in a laboratory study: (1) an opto-electronic detection method using the Selspot 1 method, and (2) a new Miniature electronic Inclinometer method. The comparison revealed that, with care in calibration, the two methods display similar torso angle measurements for a large variety of test conditions. Cross-correlation between the angle estimates averaged (rmean = 0.814) for a combination of the following lifting variables: posture of lifting, lifting height, weight of load, and horizontal distance. Variation in the correlation coefficient between the two measuring methods shows acceptable positive correlation and consistent agreement in angle trajectory over time at Thoracic (at level 5), consistency was obtained at Lumbar (level 5) and Cervical (level 4) levels. Factors affecting the performance of the two measuring methods are analyzed and the pros and cons of the method are discussed. The findings argue for the use of the new Miniature Inclinometer since it is inexpensive when compared to the Selspot 1 measuring system, provides direct angle measurements and is an easy to use technique.
AB - This paper introduces a study which was conducted to evaluate two different methods used to measure trunk kinematics during a set of controlled lifting tasks. The following two methods were compared in a laboratory study: (1) an opto-electronic detection method using the Selspot 1 method, and (2) a new Miniature electronic Inclinometer method. The comparison revealed that, with care in calibration, the two methods display similar torso angle measurements for a large variety of test conditions. Cross-correlation between the angle estimates averaged (rmean = 0.814) for a combination of the following lifting variables: posture of lifting, lifting height, weight of load, and horizontal distance. Variation in the correlation coefficient between the two measuring methods shows acceptable positive correlation and consistent agreement in angle trajectory over time at Thoracic (at level 5), consistency was obtained at Lumbar (level 5) and Cervical (level 4) levels. Factors affecting the performance of the two measuring methods are analyzed and the pros and cons of the method are discussed. The findings argue for the use of the new Miniature Inclinometer since it is inexpensive when compared to the Selspot 1 measuring system, provides direct angle measurements and is an easy to use technique.
UR - https://www.scopus.com/pages/publications/45249128680
U2 - 10.1016/0167-9457(89)90003-1
DO - 10.1016/0167-9457(89)90003-1
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AN - SCOPUS:45249128680
SN - 0167-9457
VL - 8
SP - 547
EP - 569
JO - Human Movement Science
JF - Human Movement Science
IS - 6
ER -