Excavator driver seat occupational comfort assessment with Lumbar Support Cushion

2021 ◽  
pp. 107754632110358
Author(s):  
Kaviraj Ramar ◽  
LA Kumaraswamidhas
Keyword(s):  
Physiological Stress ◽  
Whole Body Vibration ◽  
Postural Instability ◽  
Operating Conditions ◽  
Stress Factors ◽  
Whole Body ◽  
Lumbar Support ◽  
Body Vibration ◽  
Significant Difference ◽  
Operation Cycle

The operators of excavators often suffer from dreadful Whole-Body Vibration. Besides, the operators are subject to postural instability which is considered to be a serious occupational health hazard. The main objective of this study is to investigate the role of Lumbar Support Cushion in mitigation of Whole-Body Vibration and postural instability under three different operating conditions such as Front-Manipulator Motion, Swing Motion and Propel-Drive Motion. The obtained Vibration Dose Value reveals a significant difference between the operation cycle ( p < 0.001). Moreover, across the operation cycle with Lumbar Support Cushion a significant decrease in Vibration Dose Value (8) is observed on the operator seat-pan and backrest ( p < 0.05). Further, the effect of Whole-Body Vibration on physiological stress factors, a significant decrease in systolic blood pressure by 1.26%, pulse rate by 2.75% and Rate Pressure Product by 4%, is observed with the use of Lumbar Support Cushion ( p < 0.05) during the operation. The Lumbar Support Cushion helps in promoting a symmetric seating posture, and using Lumbar Support Cushion could help the excavator operator to increase in productivity during shift hour.

Investigation of Whole Body Vibration on Urban Midi Bus

2014 ◽  
Vol 592-594 ◽  
pp. 2066-2070 ◽  
Author(s):  
M. Rao Jaganmohan ◽  
S.P. Sivapirakasham ◽  
K.R. Balasubramanian ◽  
K.T. Sreenath
Keyword(s):  
Resonance Effect ◽  
Whole Body Vibration ◽  
Dynamic Test ◽  
Rear Seat ◽  
Operating Conditions ◽  
Whole Body ◽  
Static Test ◽  
Body Vibration ◽  
Exposure Limit ◽  
Vibration Magnitude

The objective of the study is to measure the whole body vibration (WBV) transmitted to the driver as well as the passengers during the operation of bus and to compare results with ISO 2631-1(1997) comfort chart and health guidance criteria. In this study, vibration exposure of the driver, passenger in the mid row seat and passenger in the rear row seat were measured at different operating conditions (static and dynamic). The BMI (Body Mass Index) was maintained for driver and passengers. The results of static test showed that the driver seat produced more vibrations compared to the passenger's mid row and rear row seat. This is due to the fact that driver seat was positioned close to the engine cabin. The results of dynamic test showed that, in all cases, the rear seat produced maximum vibrations. At 40 km/h speed the vibration magnitude exceeded the exposure limit at all tested seats. This high vibration magnitude might be due to the resonance effect caused between engine and chassis vibrations.

scholarly journals Whole Body Vibration on drivers seat and fender with fully loaded double axle tractor-trailers under different operating conditions

2021 ◽  
Vol 8 (2) ◽  
pp. 149-154
Author(s):  
MAN MOHAN DEO ◽  
ADARSH KUMAR ◽  
INDRA MANI
Keyword(s):  
Rural Areas ◽  
Health Effect ◽  
Whole Body Vibration ◽  
Operating Conditions ◽  
Whole Body ◽  
Body Vibration ◽  
Indian Agriculture ◽  
Spine Degeneration ◽  
Vector Sum ◽  
On Farm

Tractors play an important role in Indian agriculture; it is used for agricultural operations and as a common means of transportation in rural areas. It exposes the drivers and workers sitting on fenders to whole body vibration. which results into back pain, spine degeneration and even spine disc problems. Keeping this in mind a study was carried out to measure the whole body vibration on driver and fender seat with fully loaded double axle tractor-trailer under different operating conditions. Vibration was measured on two terrains (Asphalt, Farm), at three speed (10, 12, 14 km/h on asphalt terrain and 4, 5, 7 km/h on farm terrain, as per ISO-5008 (1979)), in three directions (longitudinal, transverse, and vertical) using tri-axial accelerometers. Data was taken for 120 s each and analyzed using vibration meter and analyzer for three replications of each treatments. Vector sum of vibration and Health Guidance Caution Zone upper and lower limit were obtained for different operating conditions to know the health effect of vibration.

scholarly journals Whole body vibration exercise combined with an extract of Coriandrum sativum modify some biochemical/physiological parameters in rats

2017 ◽  
Vol 37 (3) ◽  
Author(s):  
Éric H.F.F. Frederico ◽  
André L.B.D. Cardoso ◽  
Carlos A.S. Guimarães ◽  
Lívia P. Almeida ◽  
Rosane F. Neves ◽  
...  
Keyword(s):  
Body Mass ◽  
Feed Intake ◽  
Whole Body Vibration ◽  
Deionized Water ◽  
Physiological Parameters ◽  
The Body ◽  
Stool Consistency ◽  
Whole Body ◽  
Body Vibration ◽  
Significant Difference

The aim of the present study was to evaluate the effect of the association of whole body vibration (WBV) exercise with an aqueous extract of coriander on the biodistribution of the radiopharmaceutical sodium pertechnetate, on the concentration of some plasma biomarker, on the feed intake, on the body mass, and on the stool consistency in rats. Rats were divided in four groups and submitted to different treatments for 40 days. The control group (CON) received deionized water. The group treated with coriander (COR) received the extract of coriander. The rats that were exposed to WBV exercises (WBV-E) also received deionized water. A group of animals received coriander and was exposed to WBV (COR + WBV-E). We found in testis a decrease (0.13 ± 0.01 to 0.06 ± 0.03) of the percentages of injected radioactivity per gram (%ATI/g) in the WBV-E in comparison with the COR. There is no significant alteration on the concentrations of the plasma biomarkers. The feed intake showed a statistically significant increase in WBV-E. No significant difference on the body mass was found. The stool analysis showed a statistical difference on the consistency between COR (hard and dry, darker) and all the other groups (normal). In conclusion, it was verified that possible modifications in some biochemical/physiological parameters of the rats submitted to WBV exercise would be capable to increase the feed intake without changing the body mass, and normalizing the stool consistency altered by the coriander supplementation. Further studies are needed to try to understand better the biological effects involving the association of WBV exercise and coriander.

Effects of whole-body vibration on motor function in patients with Parkinson’s disease: a systematic review and meta-analysis

2020 ◽  
pp. 1-12
Author(s):  
Chuan He ◽  
Caixia Su ◽  
Wentong Zhang ◽  
Qi Wan
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Physical Therapy ◽  
Motor Function ◽  
Whole Body Vibration ◽  
Mean Difference ◽  
Whole Body ◽  
Body Vibration ◽  
Significant Difference ◽  
Walking Velocity

Abstract Objective: To review the effects of whole body vibration for patients with Parkinson’s disease. Design: Randomized clinical trials comparing whole body vibration with no vibration or conventional physical therapy for patients with Parkinson’s disease were searched up to July 31, 2019. Results: Seven studies with 196 patients were included for quantitative analysis. No significant difference was found between groups in motor score of unified Parkinson’s disease rating scale (UPDRS-III) (WMD [weighted mean difference] = −1.75, 95% CI, −5.40 to 1.90, I2 = 45.8%), functional reach test (SMD [standardized mean difference] = 0.21, 95% CI, −0.29 to 0.71; I2 = 0%), and other balance tests (including Berg balance test and Tinetti score) (SMD = 0.39, 95% CI, −0.01 to 0.80; I2 = 0%). No statistical difference was detected in walking velocity as well (WMD = −0.05, 95% CI, −0.17 to 0.06; I2 = 0%). In contrast, the pooled analysis from four studies on the Time Up and Go test showed favorable results for whole body vibration (WMD = −1.59, 95% CI, −2.90 to −0.28, I2 = 0%). Conclusion: Whole body vibration may not be beneficial over placebo or conventional physical therapy in overall motor function, balance, and walking velocity in patients with Parkinson’s disease. However, it might have positive effects on sit to stand transitions or turning.

scholarly journals OPERATORS EXPOSURE TO WHOLE-BODY VIBRATION WHILE PERFORMING FOREST SOIL PREPARATION BY BULLDOZER AND HYDRAULIC EXCAVATORS

FLORESTA ◽  
2021 ◽  
Vol 51 (4) ◽  
pp. 962
Author(s):  
Lucas Carvalho Dos Santos ◽  
Eduardo Da Silva Lopes ◽  
ALYSSON BRAUN MARTINS ◽  
Carla Krulikowski Rodrigues
Keyword(s):  
Work Organization ◽  
Whole Body Vibration ◽  
Eucalyptus Grandis ◽  
Working Hours ◽  
Wilcoxon Test ◽  
Whole Body ◽  
Body Vibration ◽  
Significant Difference ◽  
Hydraulic Excavators ◽  
Soil Preparation

The levels of exposure whole-body vibration (WBV) while performing mechanized soil preparation operations are concerning due to the exposure time of operators at their work stations, adverse terrain topography, and types of wheels on the machines used. Thus, this study aimed to evaluate the exposure to WBV in bulldozers and hydraulic excavators in performing soil preparation for forest plantation in order to identify possible ergonomic problems and propose improvements in working conditions. The study was carried out in Paraná State, Brazil, in a Eucalyptus urophylla × Eucalyptus grandis stand hybrid, being registered with use of a vibration meter and triaxial accelerometer coupled to the seat of the machines, the resulting acceleration to normalized exposure (aren) and the resulting vibration dose (VDVR) for a period of 8 working hours, following the Occupational Hygiene Standard 09. The results showed aren and VDVR values of 1.0 m s-2 and 18.3 m s-1.75 in the bulldozer, while in the hydraulic excavator it was 0.7 m s-2 and 13.5 m s-1.75, respectively, with a statistically significant difference between the machines by the Wilcoxon test for independent samples (α ≤ 0.05). The WBV levels were above the action level and below the exposure limit in both machines, with the bulldozer showing values above the uncertainty level. Therefore, substituting machines specifically designed for soil preparation and improvements in work organization are measures indicated to reduce ergonomic problems.

scholarly journals The Effects of Whole Body Vibration Training on Some Biochemical Values in Terms of Osteoporosis Risk in Premenopausal Women

2018 ◽  
Vol 6 (4a) ◽  
pp. 9
Author(s):  
Nurcan Demirel ◽  
Fatih Kaya ◽  
Salih Pınar
Keyword(s):  
Whole Body Vibration ◽  
Premenopausal Women ◽  
Acute Effect ◽  
Exercise Group ◽  
Whole Body ◽  
Assay Method ◽  
Control Group ◽  
Body Vibration ◽  
Significant Difference ◽  
Group Comparisons

The main purpose of the present study is to comparatively examine the effects of Whole body vibration (WBV) trainings on some biochemical bone-turnover markers (Beta-CTx, Osteocalcin) in terms of osteoporosis. Twenty-four sedentary women (mean age=37.12±1.84 years) participated in the study. The participants were randomly divided to 3 groups: whole body vibration exercise group (WBV, n=8), classical resistance exercise group (CR, n=8), and control group (CO, n=8). Vibration trainings and classical resistance trainings were applied in similar exercise models for major muscle groups three days a week for eight weeks, not on consecutive days but in the same contexts. Of biochemical values, Beta-CTx and Osteocalcin were analysed by using Cobas e 411 ECLIA (Electro Chem. Luminance Immune Assay) method before and after the eight-week exercise period. For intra-group comparisons paired-samples t-test, for inter-group comparisons one way ANOVA, and for multi-comparisons Tukey test were used. While a statistically significant difference was found between pretest posttest of Beta-CTx and Osteocalcin values of CR (p<.05), there was not a significant difference in WBV and CO groups (p>.05). A statistically significant difference was found between the groups in terms of pretest posttest biochemical value changes (Beta-CTx, Osteocalsin) of the participants (p<.05). As a result, eight-week WBV training in premenopausal women can be considered as safe in terms of biochemical values’ (Beta-CTx, Osteocalcin) remaining unchanged. On the other hand, CR training made significant changes on the values in question. Whether this change is an acute effect or not has become a raising question. This case can be studied in premenopausal women in further research.

Influence of seat lumbar support adjustment on muscle fatigue under whole body vibration: An in vivo experimental study

2021 ◽  
pp. 1-13
Author(s):  
Li-Xin Guo ◽  
Rui-Chun Dong ◽  
Sheng Yuan ◽  
Qing-Zhi Feng ◽  
Wei Fan
Keyword(s):  
Muscle Fatigue ◽  
Muscle Activation ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Lumbar Support ◽  
Body Vibration ◽  
Activation Level ◽  
Lumbar Muscle ◽  
Support Conditions ◽  
Small Support

BACKGROUND: In order to alleviate muscle fatigue and improve ride comfort, many published studies aimed to improve the seat environment or optimize seating posture. However, the effect of lumbar support on the lumbar muscle of seated subjects under whole body vibration is still unclear. OBJECTIVE: This study aimed to investigate the effect of lumbar support magnitude of the seat on lumbar muscle fatigue relief under whole body vibration. METHODS: Twenty healthy volunteers without low back pain participated in the experiment. By measuring surface electromyographic signals of erector spinae muscles under vibration or non-vibration for 30 minutes, the effect of different lumbar support conditions on muscle fatigue was analyzed. The magnitude of lumbar support d is assigned as d1= 0 mm, d2= 20 mm and d3= 40 mm for no support, small support and large support, respectively. RESULTS: The results showed that lumbar muscle activation levels vary under different support conditions. For the small support case (d2= 20 mm), the muscle activation level under vibration and no-vibration was the minimum, 42.3% and 77.7% of that under no support (d1= 0 mm). For all support conditions, the muscle activation level under vibration is higher than that under no-vibration. CONCLUSIONS: The results indicate that the small support yields the minimum muscle contraction (low muscle contraction intensity) under vibration, which is more helpful for relieving lumbar muscle fatigue than no support or large support cases. Therefore, an appropriate lumbar support of seats is necessary for alleviating lumbar muscle fatigue.

scholarly journals Effects of whole body vibration on human contrast sensitivity function

2021 ◽  
Vol 65 ◽  
pp. 86-90
Author(s):  
B Bhowmick ◽  
D Gaur ◽  
P Rastogi
Keyword(s):  
Contrast Sensitivity ◽  
Whole Body Vibration ◽  
Low Frequency ◽  
Visual Performance ◽  
Whole Body ◽  
Low Frequencies ◽  
Body Vibration ◽  
Operational Conditions ◽  
Spatial Frequencies ◽  
Significant Difference

Introduction: Vibration is a known aeromedical stressor in rotary-winged aircraft and is known to affect visual acuity (VA). In aerospace operational conditions, contrast sensitivity (CS) takes the upper hand over VA for optimal visual performance. Examination of the effects of low frequencies whole body vibration of short duration on CS was the desired objective of the study. Material and Methods: Thirty healthy volunteers were exposed to low frequency whole body vibration using Multi-axial Vibration Simulator. Vibration frequency along the Z-axis varied from 4 to 20 Hz over a period of 30 min. CS was recorded in no vibration, under vibration and 30 min following exposure to vibration using CSV-1000 equipment at spatial frequencies of 3, 6, 12, and 18 cycles per degree (cpd). Results: CS, after an initial degradation, gradually improved with the increase in frequencies of vibration for the lower spatial frequencies (3, 6 cpd). The increasing trend was also noticed for higher spatial frequencies (12, 18 cpd) till 16 Hz; thereafter, a significant dip (P = 0.048) was observed at 20 Hz of vibration. No significant difference was observed following 30 min of post exposure. Conclusion: In contrast to the popular belief, an improvement in CS with increasing frequencies of vibration could be concluded from the results of the study. However, the sudden decrement in CS at higher CPD at higher frequencies of vibration could adversely affect visual performance of an aircrew.

scholarly journals Early Post-Operative Intervention of Whole-Body Vibration in Patients After Total Knee Arthroplasty: A Pilot Study

2019 ◽  
Vol 8 (11) ◽  
pp. 1902 ◽  
Author(s):  
Yu-Hsuan Hsiao ◽  
Song-Hsiung Chien ◽  
Hung-Pin Tu ◽  
Jimmy Chun-Ming Fu ◽  
Shih-Ting Tsai ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Osteoarthritis ◽  
Knee Arthroplasty ◽  
Whole Body Vibration ◽  
Knee Extensor ◽  
Whole Body ◽  
Body Vibration ◽  
Knee Extensor Strength ◽  
Significant Difference ◽  
Total Knee

(1) Background: Knee osteoarthritis causes pain, weakness, muscle atrophy, and disability. The application of whole-body vibration in patients with knee osteoarthritis can improve strength, balance, and functional activities. The purpose of the study is to evaluate the effects of early whole-body vibration intervention in patients after total knee arthroplasty. (2) Method: A single-blinded randomized control trial. Fifty-two patients with knee osteoarthritis post total knee replacement from a medical center in southern Taiwan were randomly assigned to either a whole-body vibration group or control group. Main outcome measures included pain severity, leg circumference, knee range of motion, knee extensor strength, a five-times sit to stand test, and a timed up and go test. (3) Results: Immediately post treatment, the patients in the vibration group showed a significant increase in knee extensor strength and improvement in calf swelling compared to the control group. A trend toward decrease in pain severity and improvement in functional performance were observed in both groups without a significant difference between the groups. There was no significant difference in knee range of motion (ROM) and functional performance between the groups. (4) Conclusions: The whole-body vibration intervention in patients early post total knee arthroplasty showed significant immediate effect in increasing knee extensor strength and decreasing calf swelling.

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