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Comparison of infant car seat grip orientations and lift strategies.

Authors
Clamann-M; Zhu-B; Beaver-L; Taylor-K; Kaber-D
Source
Appl Ergon 2012 Jul; 43(4):650-657
NIOSHTIC No.
20041188
Abstract
The rear-facing Infant Car Seat (ICS) is designed to meet federal requirements for transporting children less than 1 year old. Typical use includes transfer in and out of a vehicle, which is shown to be a difficult lift. Despite the frequency of this lift, manufacturers provide little guidance for users. Review of relevant literature suggested an ICS featuring an angled handle, promoting a neutral wrist posture, would increase grip stability and decrease lifting effort. Popular press suggested a foot-in-car stance for the ICS lift would do the same. An experiment was conducted in which wrist deviations from neutral posture were recorded along with lifting muscle activation levels (multiple flexor muscles and biceps brachii) and overall perceived exertion for straight versus a new bent handle design and conventional stance versus foot-in-car. Foot position was examined to test the recommendations in the popular press. Surprisingly, wrist deviation was not significantly affected by the new bent handle design (due to compensatory behavior with the straight handle) but was related to foot placement (p=0.04). Results revealed the bent handle to significantly reduce flexor activation compared with the straight handle (p=0.0003); however, the level of biceps activation increased. Biceps activation also significantly increased for foot-in-car stance (p=0.035) but not flexor activation. In general, the bent handle enabled the user to lift the ICS with a steadier grip and less effort.
Keywords
Humans; Children; Physiology; Men; Women; Motor-vehicles; Physiological-factors; Muscles; Musculoskeletal-system; Equipment-design; Age-groups; Ergonomics; Manual-lifting; Author Keywords: Handle design; Lifting task; Infant car seat; Ergonomics; Manual-lifting
Contact
Michael Clamann, North Carolina State University, Edward P. Fitts Department of Industrial & Systems Engineering, Raleigh, NC 27695
CODEN
AERGBW
Publication Date
20120701
Document Type
Journal Article
Email Address
mpclaman@ncsu.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008673; B08142012
Issue of Publication
4
ISSN
0003-6870
Source Name
Applied Ergonomics
State
NC
Performing Organization
University of North Carolina, Chapel Hill, North Carolina
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