| Determination of backrest inclination based on biodynamic response study for prevention of low back pain. | |
| | |
MedLine Citation:
|
PMID: 20299270 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Whole-body vibration experiments with subjects under vertical vibration were performed to examine and evaluate effects of backrest inclination on vibration transmitted through seats to the human body by using biodynamic response parameters represented by apparent mass (APMS) and vibration power absorption (VPA). The biodynamic response parameters of twelve male subjects, exposed to vertical random vibration at 0.8 m/s(2) r.m.s., were characterized under three different backrest support conditions, with the upper body supported against backrest inclined at angles of 0 degrees (vertical), 10 degrees, and 30 degrees with respect to the vertical axis. An increased backrest inclination angle resulted in reduction of the total power absorption calculated particularly the frequency range of 1-20 Hz. Normalized APMS magnitudes showed a principal resonance at about 5 Hz for each subject for a backrest supported vertically. A second resonant peak appeared at about 7.5 Hz in addition to the primary resonant peak for a backrest inclined at an angle of 10 degrees and then became much steeper for a backrest inclined at angle of 30 degrees. For a backrest inclined at an angle of 30 degrees, the resonant peak at 5 Hz was less apparent than in other backrest inclination postures. All subjects showed the second resonant peak at about 7.5 Hz in the double-normalized VPA for a backrest inclined at an angle of 30 degrees. According to the evaluation of vibration absorption behavior performed in this study, backrest inclination angle is preferable between 10 degrees and 30 degrees from the viewpoint of prevention of low back pain disorder. |
| | |
Authors:
|
Nobuyuki Shibata; Setsuo Maeda |
Publication Detail:
|
Type: Clinical Trial; Journal Article Date: 2010-03-17 |
Journal Detail:
|
Title: Medical engineering & physics Volume: 32 ISSN: 1873-4030 ISO Abbreviation: Med Eng Phys Publication Date: 2010 Jul |
Date Detail:
|
Created Date: 2010-07-08 Completed Date: 2010-10-13 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9422753 Medline TA: Med Eng Phys Country: England |
Other Details:
|
Languages: eng Pagination: 577-83 Citation Subset: IM |
Copyright Information:
|
Copyright 2010 IPEM. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
|
Human Engineering and Risk Management Research Group, National Institute of Occupational Safety and Health, 6-21-1, Nagao, Tama-ku, Kawasaki, 214-8585, Japan. shibata@h.jniosh.go.jp |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Absorption Adolescent Biomechanics Health Humans Low Back Pain / physiopathology, prevention & control* Male Posture / physiology* Risk Assessment Safety Vibration Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Ultrasound-promoted greener synthesis of benzoheterocycle derivatives catalyzed by nanocrystalline c...
Next Document: Evaluation of the optimal lengths and number of multiple windows for spectrogram estimation of SSVEP...