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Analysis of musculoskeletal loading in an index finger during tapping.

Authors
Wu-JZ; An-KN; Cutlip-RG; Krajnak-K; Welcome-D; Dong-RG
Source
J Biomech 2008 Mar; 41(3):668-676
NIOSHTIC No.
20033528
Abstract
Since musculoskeletal disorders of the upper extremities are believed to be associated with repetitive excessive muscle force production in the hands, understanding the time-dependent muscle forces during key tapping is essential for exploring the mechanisms of disease initiation and development. In the current study, we have simulated the time-dependent dynamic loading in the muscle/tendons in an index finger during tapping. The index finger model is developed using a commercial software package AnyBody, and it contains seven muscle/tendons that connect the three phalangeal finger sections. Our simulations indicate that the ratios of the maximal forces in flexor digitorum superficialis (FS) and flexor digitorum profundus (FP) tendons to the maximal force at the fingertip are 0.95 and 2.9, respectively, which agree well with recently published experimental data. The time sequence of the finger muscle activation predicted in the current study is consistent with the EMG data in the literature. The proposed model will be useful for bioengineers and ergonomic designers to improve keyboard design minimizing musculoskeletal loadings in the fingers.
Keywords
Biomechanics; Ergonomics; Cumulative-trauma-disorders; Cumulative-trauma; Repetitive-work; Biomechanical-modeling; Models; Musculoskeletal-system-disorders; Musculoskeletal-system
Contact
John Z. Wu, CDC, NIOSH, 1095 Willowdale Rd,MS 2027, Morgantown, WV 26505
CODEN
JBMCB5
Publication Date
20080301
Document Type
Journal Article
Email Address
jwu@cdc.gov
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
3
ISSN
0021-9290
NIOSH Division
HELD
Source Name
Journal of Biomechanics
State
WV
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