scholarly journals Influence of Tire Characteristics of Interurban Taxis on Exposure Level to Drivers Whole-Body Vibrations

2016 ◽  
Vol 2 (4) ◽  
pp. 35-43
Author(s):  
Milad Derakhshanjazari ◽  
Mohammadreza Monazzam ◽  
Seyed mostafa Hosseini ◽  
◽  
◽  
...  
Keyword(s):  
Whole Body ◽  
Exposure Level ◽  
Whole Body Vibrations

Multi-Axis Sinusoidal Whole-Body Vibrations: Part I — How Long Should the Vibration and Rest Exposures Be for Reliable Discomfort Measures?

2006 ◽  
Vol 25 (3) ◽  
pp. 175-184 ◽  
Author(s):  
James P. Dickey ◽  
Michele L. Oliver ◽  
Paul-Emile Boileau ◽  
Tammy R. Eger ◽  
Lana M. Trick ◽  
...  
Keyword(s):  
Whole Body ◽  
Whole Body Vibrations

Frequency dependence of vertical whole-body vibration perception - is your car rattling or humming?

2021 ◽  
Vol 263 (2) ◽  
pp. 4913-4918
Author(s):  
Anna Schwendicke ◽  
M. Ercan Altinsoy
Keyword(s):  
Frequency Dependence ◽  
Whole Body Vibration ◽  
Human Perception ◽  
Whole Body ◽  
Frequency Content ◽  
Body Vibration ◽  
Acoustic Stimuli ◽  
The Past ◽  
Whole Body Vibrations ◽  
Vibration Perception

Humans perceive whole-body vibration in many daily life situations. Often they are exposed to whole-body vibration in combination with acoustic events. Sound and vibration usually stems from the same source, for example concerts or travelling in vehicles, such as automobile, aircrafts, or ships. While we can describe acoustic stimuli using psychoacoustic descriptors such as loudness or timbre, the description human perception of whole body vibration frequently has been reduced to comfort or quality in the past. Unlike loudness or timbre, comfort and quality are dependent on the overall context. Especially in vehicles expectations might differ lot between different vehicle classes. Previous studies have evaluated a large range of suitable descriptors for whole-body vibrations that are independent of context. They suggest that certain descriptors are driven to a large extend by the frequency content of the vibration. This study systematically investigates the influence of frequency content on the perception of whole-body vibration varying frequency content and intensity of the vibrations. The results verify the frequency dependence of specific descriptors and identify the respective frequency ranges.

scholarly journals Occupational Vibration in Urban Bus and Influence on Driver’s Lower Limbs

2018 ◽  
Vol 4 (1) ◽  
pp. 56-66
Author(s):  
M. Cvetkovic ◽  
J. Santos Baptista ◽  
M. A. Pires Vaz
Keyword(s):  
Whole Body Vibration ◽  
Working Environment ◽  
Lower Limbs ◽  
Whole Body ◽  
Body Vibration ◽  
Prisma Statement ◽  
Physical Changes ◽  
Iso 2631 ◽  
The Impact ◽  
Whole Body Vibrations

The whole-body vibration occurs in many occupational activities, promoting discomfort in the working environment and inducing a variety of psycho – physical changes where consequences as a permanent dysfunction of certain parts of the organism may occur. The main goal of this short systematic review is finding the articles with the most reliable results relating whole-body vibrations to buses and, to compare them with the results of drivers’ lower limbs musculoskeletal disease which occurs as a consequence of many year exposure. PRISMA Statement Methodology was used and thereby 27 Scientific Journals and 25 Index - Database were searched through where 3996 works were found, of which 24 were included in this paper. As a leading standard for analysis of the whole-body vibration the ISO 2631 – 1 is used, while in some papers as an additional standard the ISO 2631-5 is also used for the sake of better understanding the vibrations. Furthermore, the European Directive 2002/44 / EC is included where a daily action exposure to the whole-body vibrations is exactly deter-mined. All the results presented in the paper were compared with the aforesaid standards. After having searched the databases, papers that deal with research of the impact of the vibration on the driver’s lower limbs did not contain any information’s on the described problem.

1,1,2,2-Tetrafluoroethane (HFC-134) (2018)

2019 ◽  
Vol 35 (3) ◽  
pp. 196-203
Keyword(s):  
Adverse Effect ◽  
Adverse Effects ◽  
Toxicity Study ◽  
Whole Body ◽  
Exposure Level ◽  
Inhalation Toxicity ◽  
Hfc 134A ◽  
Adverse Effect Level ◽  
Effect Level ◽  
Whole Body Inhalation

1,1,2,2-Tetrafluoroethane (HFC-134) is a colorless gas used as a foam expansion agent and heat transfer fluid. HFC-134 has a low acute inhalation toxicity with an LC50 of >244,000 ppm. The no-observed adverse effect level (NOAEL) and lowest-observed adverse effect level for cardiac sensitization (in epinephrine-challenged beagle dogs) were 75,000 and 100,000 ppm, respectively. A subacute 4-week GLP inhalation toxicity study exposed male and female Crl: CD®BR rats (10/sex) to 0, 2000, 10,000, or 50,000 ppm via whole-body inhalation. Transient and non-dose-response–related body weight changes were observed throughout the exposure period, but no statistically significant, test substance-related adverse effects were observed in any clinical observations, chemistry, hematology, or pathology. This study identified a NOAEL for HFC-134 of 50,000 ppm, the highest exposure level tested. HFC-134 is not genotoxic in in vitro studies; however, no in vivo studies are available. No developmental or maternal toxicity was found in female rats exposed to HFC-134 up to 50,000 ppm via whole-body inhalation in two different studies. Based on data for a similar material (HFC-134a), HFC-134 is not expected to be extensively metabolized or to cause genetic toxicity or carcinogenicity. The HFC-134 workplace environmental exposure level (WEEL) is based primarily on the subacute 4-week inhalation toxicity study in rats with the NOAEL of 50,000 ppm selected as the point of departure for the derivation of the 8-h TWA, health-based WEEL value. The developmental toxicity study also had a NOAEL of 50,000 ppm and was the highest exposure level tested. The subacute inhalation NOAEL was adjusted to account for interindividual variability, subacute to chronic duration, animal to human extrapolation, daily duration of exposure, and residual uncertainty. In addition, the lack of adverse effects noted in the toxicology studies for HFC-134a was considered. The resulting 8-h TWA WEEL value of 1000 ppm is expected to provide a significant margin of safety against the production of any potential adverse health effects in workers following long-term inhalation exposure to HFC-134.

Changes in postural sway frequency and complexity in altered sensory environments following whole body vibrations

2012 ◽  
Vol 31 (5) ◽  
pp. 1238-1246 ◽  
Author(s):  
D. Clark Dickin ◽  
Matthew A. McClain ◽  
Ryan P. Hubble ◽  
Jon B. Doan ◽  
David Sessford
Keyword(s):  
Postural Sway ◽  
Whole Body ◽  
Whole Body Vibrations ◽  
Sway Frequency

scholarly journals Occupational exposure to whole body vibrations and birth outcomes – A nationwide cohort study of Swedish women

2021 ◽  
Vol 751 ◽  
pp. 141476
Author(s):  
H. Skröder ◽  
H. Pettersson ◽  
F. Norlén ◽  
P. Gustavsson ◽  
L. Rylander ◽  
...  
Keyword(s):  
Cohort Study ◽  
Occupational Exposure ◽  
Birth Outcomes ◽  
Whole Body ◽  
Whole Body Vibrations

The influence of vibration on the quality of gait in women with cerebral palsy

2015 ◽  
Vol 14 (2) ◽  
Author(s):  
Andrzej Myśliwiec ◽  
Michał Kuszewski ◽  
Edward Saulicz ◽  
Adam Posłuszny ◽  
Anna Jagiełło ◽  
...  
Keyword(s):  
Cerebral Palsy ◽  
Movement Analysis ◽  
Whole Body ◽  
Desktop Computer ◽  
Rehabilitation Process ◽  
Smart System ◽  
Gait Parameters ◽  
Vibration Experiment ◽  
Whole Body Vibrations

AbstractIn contrast to a normal gait, the locomotion of people with infantile cerebral palsy (ICP) is characterized by great variability. An experiment was conducted to determine if the use of whole-body vibrations changes the time of support by each of the extremities as well as the range of flexion of the hip and knee articulations. Three women with ICP were involved in the whole-body vibration experiment. The parameters of the vibration adopted during training were a frequency of 20 Hz and an amplitude of 2 mm. The BTS Smart system for three-plane movement analysis paired with a desktop computer was used for the evaluation of gait parameters. The vibration procedure improved the range of flexion in knee articulation but did not change the range of flexion in hip articulation. The equalization of time disparities in the load of both extremities was obtained after the first treatment procedure. In this investigated group, the vibration procedure may be a complement to the rehabilitation process.

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