Laboratory-based whole-body vibration studies often involve complex experimental designs, dozens of vibration exposures and multiple sessions. Shortening the test vibration duration would increase experimental efficiency by permitting more trials in the same time period. This study evaluated reported discomfort based on different sinusoidal vibration durations and amounts of rest between successive vibrations. Ten subjects were exposed to four blocks of vibration trials (15/20 second vibration and 5/10 second rest durations). Each block of 37 trials included repeated single axis, planar, and 6 degree of freedom multi-axial vibrations. These repeated trials were analysed to evaluate whether discomfort varied between the different blocks. We did not observe any statistically significant differences in discomfort between the different vibration and rest durations. This finding is useful for designing future vibration experiments. Part II of this study evaluates the relationship between discomfort and vibration exposure.
PunnettL.Pruss-UtunA.NelsonD.l.FingerhutM.A.LeighJ.TakS., and PhillipsS., Estimating the global burden of low back pain attributable to combined occupational exposures, American Journal of Industrial Medicine, 2005, Vol. 48, No. 6, pp. 459–469.
2.
BovenziM., Low back pain disorders and exposure to whole-body vibration in the workplace, Seminars in Perinatology, 1996, Vol. 20, No. 1, pp. 38–53.
3.
BovenziM.HulshofC.T., An updated review of epidemiologic studies on the relationship between exposure to whole-body vibration and low back pain (1986–1997), International Archives of Occupational and Environmental Health, 1999, Vol. 72, No. 6, pp. 351–365.
4.
LingsS.Leboeuf-YdeC., Whole-body vibration and low back pain: A systematic, critical review of the epidemiological literature 1992–1999, International Archives of Occupational and Environmental Health, 2000, Vol. 73, No. 5, pp. 290–297.
5.
CannA.P.SalmoniA.W.ViP., and EgerT.R., An exploratory study of whole-body vibration exposure and dose while operating heavy equipment in the construction industry, Applied Occupational and Environmental Hygiene, 2003, Vol. 18, No. 12, pp. 999–1005.
6.
BoileauP.E.RakhejaS., Vibration attenuation performance of suspension seats for off-road forestry vehicles, International Journal of Industrial Ergonomics, 1990, Vol. 5, No. 3, pp. 275–291.
7.
VillageJ.MorrisonJ.B., and LeongD.K., Whole-body vibration in underground load-haul-dump vehicles, Ergonomics, 1989, Vol. 32, No. 10, pp. 1167–1183.
8.
KumarS., Vibration in operating heavy haul trucks in overburden mining, Applied Ergonomics, 2004, Vol. 35, No. 6, pp. 509–520.
9.
ElsP.S., The applicability of ride comfort standards to off-road vehicles, Journal of Terramechanics, 2005, Vol. 42, No. 1, pp. 47–64.
10.
GogliaV.Grbacl., Whole-body vibration transmitted to the framesaw operator, Applied Ergonomics, 2005, Vol. 36, No. 1, pp. 43–48.
11.
SherwinL.M.OwendeP.M.KanaliC.L.LyonsJ., and WardS.M., Influence of tyre inflation pressure on whole-body vibrations transmitted to the operator in a cut-to-length timber harvester, Applied Ergonomics, 2004, Vol. 35, No. 3, pp. 253–261.
12.
EgerT.SalmoniA.CannA., and JackR., Whole-body vibration exposure experienced by mining equipment operators, Occupational Ergonomics, 2006, In Press).
13.
GriefahnB.BrodeP., Comfort contours: Inter-axis equivalence, Journal of Sound and Vibration, 1997, Vol. 204, No. 1, pp. 85–97.
14.
MatsumotoY.MaedaS., and OjiY., Influence of frequency on difference thresholds for magnitude of vertical sinusoidal whole-body vibration, Industrial Health, 2002, Vol. 40, No. 4, pp. 313–319.
15.
van NiekerkJ.L.PielemeierW.J., and GreenbergJ.A., The use of seat effective amplitude transmissibility (SEAT) values to predict dynamic seat comfort, Journal of Sound and Vibration, 2003, Vol. 260, No. 5, pp. 867–888.
16.
MansfieldN.J.HolmlundP., and LundstromR., Comparison of subjective responses to vibration and shock with standard analysis methods and absorbed power, Journal of Sound and Vibration, 2000, Vol. 230, No. 3, pp. 477–491.
17.
WilderD.MagnussonM.L.FenwickJ., and PopeM., The effect of posture and seat suspension design on discomfort and back muscle fatigue during simulated truck driving, Applied Ergonomics, 1994, Vol. 25, No. 2, pp. 66–76.
18.
MatsumotoY.GriffinM.J., Effect of muscle tension on non-linearities in the apparent masses of seated subjects exposed to vertical whole-body vibration, Journal of Sound and Vibration, 2002, Vol. 253, No. 1, pp. 77–92
19.
MaedaS., Necessary research for standardization of subjective scaling of whole-body vibration, Industrial Health, 2005, Vol. 43, No. 3, pp. 390–401.
20.
International Standards Organization, ISO 2631–1: Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration — Part 1: General requirements. 1997. Geneva, Switzerland, International Standards Organization.
21.
DemicM.LukicJ., and MilicZ., Some aspects of the investigation of random vibration influence on ride comfort, Journal of Sound and Vibration, 2002, Vol. 253, No. 1, pp. 109–129.
22.
BroedeP.BrueningT., and GriefahnB., Equivalent sensation curves of simultaneous lateral and vertical sinusoidal whole-body vibration, Aviation, Space and Environmental Medicine, 1998, Vol. 69, No. 10, pp. 986–991.
23.
ShoenbergerR.W., Psychophysical comparison of vertical and angular vibrations, Aviation, Space and Environmental Medicine, 1980, Vol. 51, No. 8, pp. 759–762.
24.
LeatherwoodJ.D.DempseyT.K., and ClevensonS.A., A Design Tool for Estimating Passenger Ride Discomfort Within Complex Ride Environments, Human Factors, 1980, Vol. 22, No. 3, pp. 291–312.
25.
DempseyT.K.CoatesG.D., and LeatherwoodJ.D., An Investigation of Ride Quality Rating Scales. 1977, NASA TP-1064, 1–45.
26.
de LoozeM.P.Kuijt-EversL.F., and van DieenJ., Sitting comfort and discomfort and the relationships with objective measures, Ergonomics, 2003, Vol. 46, No. 10, pp. 985–997.
27.
LeatherwoodJ.D.DempseyT.K., and ClevensonS.A., An Experimental Study for Determining Discomfort Response to Roll Vibration. 1976, NASA TN D-8266, 1–27.
28.
GriffinM.J.WhithamE.M., Duration of Whole-Body Vibration Exposure: Its Effect on Comfort, Journal of Sound and Vibration, 1976, Vol. 48, No. 3, pp. 333–339.
29.
ClevensonS.A.DempseyT.K., and LeatherwoodJ.D., Effect of vibration duration on human discomfort. 1978, NASA TP-1283, 1–23.
30.
KanekoC.HagiwaraT., and MaedaS., Evaluation of whole-body vibration by the category judgment method, Industrial Health, 2005, Vol. 43, No. 1, pp. 221–232.
31.
AnnettJ., Subjective rating scales: Science or art?, Ergonomics, 2002, Vol. 45, No. 14, pp. 966–987.
32.
ShoenbergerR.W., Intensity judgments of vibrations in the Y axis, Z axis, and Y-plus-Z axes, Aviation, Space and Environmental Medicine, 1987, Vol. 58, No. 8, pp. 783–787.
