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Muscular activity of lower limb muscles associated with working on inclined surfaces.

Authors
Lu-M-L; Kincl-L; Lowe-B; Succop-P; Bhattacharya-A
Source
Ergonomics 2015 Feb; 58(2):278-290
NIOSHTIC No.
20045284
Abstract
This study investigated the effects of visual cues, muscular fatigue, task performance and experience of working on inclined surfaces on activity of postural muscles in the lower limbs associated with maintaining balance on three inclined surfaces - 0 degrees, 14 degrees and 26 degrees. Normalised electromyographic (NEMG) data were collected in 44 professional roofers bilaterally from the rectus femoris, biceps femoris, tibialii anterior and gastrocnemii medial muscle groups. The 50th and 95th percentile NEMG amplitudes were used as EMG variables. Results showed that inclination angle and task performance caused a significant increase in the NEMG amplitudes of all postural muscles. Visual cues were significantly associated with a decrease in the 95th percentile EMG amplitude for the right gastrocnemius medial and tibialis anterior. Fatigue was related to a significant decrease in the NEMG amplitude for the rectus femoris. Experience of working on inclined surfaces did not have a significant effect on the NEMG amplitude. Practitioner Summary: Increasing angle of the working surface and task performance are two main factors contributing to muscular loading in the lower limb muscles. Input of visual cues while working on inclined surfaces may provide beneficial effects on reducing muscular loading to prevent occupational falls.
Keywords
Ergonomics; Musculoskeletal-system; Muscle-function; Muscle-physiology; Muscle-stress; Fatigue; Work-environment; Surface-properties; Height-factors; Task-performance; Body-mechanics; Body-regions; Body-distribution; Electrophysiological-examinations; Construction; Construction-workers; Roofers; Humans; Injury-prevention; Author Keywords: EMG; postural stability; visual cues; fatigue; inclined surfaces
Contact
Ming-Lun Lu, Taft Laboratories, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS C-24, Cincinnati, OH 45226, USA
CODEN
ERGOAX
Publication Date
20150201
Document Type
Journal Article
Email Address
mlu@cdc.gov
Funding Amount
1221666
Funding Type
Grant
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003400; M102014
Issue of Publication
2
ISSN
0014-0139
NIOSH Division
DART
Priority Area
Disease and Injury: Low Back Disorders
Source Name
Ergonomics
State
OH; OR
Performing Organization
University of Cincinnati, College of Medicine, Cincinnati, Ohio
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