dc.contributor.advisor | Wilson, Sara E. | |
dc.contributor.author | Channamallu, Raghu Ram | |
dc.date.accessioned | 2008-03-01T17:27:10Z | |
dc.date.available | 2008-03-01T17:27:10Z | |
dc.date.issued | 2007-12-16 | |
dc.date.submitted | 2007 | |
dc.identifier.other | http://dissertations.umi.com/ku:2351 | |
dc.identifier.uri | http://hdl.handle.net/1808/1994 | |
dc.description.abstract | Exposure to occupational whole body vibration (WBV) is associated with low back pain disorders, musculoskeletal disorders, and degeneration of spine. Transmission of vibration to the neuromotor system may play a role in the etiology of these injuries. Such WBV has components in the vertical, lateral and fore-aft directions. However, few studies have examined biodynamic vibration transmission in the fore-aft direction and no study has examined transmission of fore-aft vibration to the neuromotor system. The primary objective of this study was to assess the response characteristics of the fore-aft seatpan vibration. A secondary objective was to examine the effect of a backrest on these characteristics. Nineteen subjects participated in the study (10 male, 9 female, mean age 24 3(SD) years, height 1.6 . 05 m (SD), weight 69 7 kg (SD)). The transmission of vibration to vibration-induced lumbar rotation (TF2) and paraspinal muscle activity (TF3), with and without the backrest, were quantified for a frequency range of 3-14 Hz at 1 RMS (ms-2) and 2 RMS (ms-2) vibration magnitudes. The mechanical transmission to lumbar rotations did not exhibit resonance within the measured frequency range without the backrest. The mechanical transmission with a backrest exhibited a ratio greater than one between 3-6 Hz indicating a resonance phenomena. Mechano-neuromotor transmission, the relationship between lumbar rotation and paraspinal muscle activity (TF4), without the backrest, exhibited a double peaked trend with a primary peak at 5-6 Hz and a secondary peak at 11 Hz. The primary peak at 5-6 Hz may be a result of coupled vertical motion and the 11 Hz might correspond to the internal resonance of the neuromuscular system. The small peaks at 6, 10 and 12 Hz for 1 RMS (ms-2) and a larger peak at 8 Hz for 2 RMS (ms-2) were exhibited in TF4 with the backrest. The peaks at 6 and 8 Hz may be a result of coupled vertical motion or a result of external stimulating agent. The secondary peaks might be a result of internal resonance of the neuromuscular system. These results can be used in experiments examining the effects of fore-aft WBV on neuromotor habitation and muscular fatigue. | |
dc.format.extent | 98 pages | |
dc.language.iso | EN | |
dc.publisher | University of Kansas | |
dc.rights | This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. | |
dc.subject | Mechanical engineering | |
dc.title | Neuromotor Transmissibility of Horizontal Seatpan Vibration | |
dc.type | Thesis | |
dc.contributor.cmtemember | Faddis, Terry | |
dc.contributor.cmtemember | Kieweg, Sarah | |
dc.thesis.degreeDiscipline | Mechanical Engineering | |
dc.thesis.degreeLevel | M.S. | |
kusw.oastatus | na | |
kusw.oapolicy | This item does not meet KU Open Access policy criteria. | |
kusw.bibid | 6599346 | |
dc.rights.accessrights | openAccess | |