Quantifying The Impact That Coxswain Behaviour Has on Whole Body Vibration - Simulator Trial

2021 ◽  
Vol 163 (A3) ◽  
Author(s):  
T J Newman
Keyword(s):  
Phase 1 ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Motion Platform ◽  
Body Vibration ◽  
Sea Trial ◽  
Data Driven Approach ◽  
Exposure Levels ◽  
Transit Speed ◽  
The Impact

A common risk to personnel is from Whole Body Vibration (WBV) and shock when transiting at speed in heavy seas, and much research has been done by maritime organisations to reduce this risk and the associated health impacts. It is well known that coxswain ‘driving style’ can radically affect exposure levels for a given sea state and sustained transit speed. A data-driven approach to define what makes a good coxswain from a WBV perspective is currently being developed by the Naval Design Partnering team (NDP). In phase 1, a systematic coxswain behaviour tracking methodology has been developed and demonstrated using a motion platform-based fast craft simulator at MARIN. The performance of several experienced volunteer coxswains from MOD, RNLI and KNRM has been evaluated based on a set pattern of tests. The advantages of using the simulator, over a sea trial, have been demonstrated: it is more repeatable, more controllable, accurate and more accessible. The potential disadvantages of the approach are also discussed with reference to feedback gathered from coxswains. Analysis has shown effective throttle control is much more important than steering to reduce WBV. Several interesting trends in WBV reduction potential have been shown which it is thought, with further validation, could aid mission planning, mission execution and provide data for training autonomous feedback/control algorithms. Further work is required before the findings of this study can be fully exploited. These subsequent phases, which include sea trials, aim to provide validation and further evidence to support the initial findings.

scholarly journals Preventive action with a population of excavator drivers exposed to whole-body vibration

Work ◽  
2021 ◽  
Vol 68 (2) ◽  
pp. 473-481
Author(s):  
P. Bossi ◽  
P. Meert
Keyword(s):  
Back Pain ◽  
Lower Back Pain ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Preventive Action ◽  
Body Vibration ◽  
Lower Back ◽  
Work Tasks ◽  
Determining Factors ◽  
Exposure Levels

BACKGROUND: Whole-body vibration is a major cause of lower back pain among employees, and the medical and preventive care teams of occupational health departments are often confronted with lower back pain problems among machine operators. OBJECTIVES: The objectives of this research are to determine the number of excavator drivers exposed to whole-body vibration levels above 0.5m/s2, identify other exposure factors that may contribute to back pain, and propose corrective measures. METHODS: Vibration measurements were carried out on individual excavator drivers while they were observed carrying out working tasks, after which prevention advice is given. Factors which determine vibration levels are logged on to a database. RESULTS: The multivariate analysis of several determining factors shows vibration exposure levels vary depending on the varied work tasks being carried out. CONCLUSION: This study identifies exposed employees among excavator operators. For each workstation, the determining factors that could explain the high exposures to vibrations are identified. This work shows the important role of tasks on exposure levels. A better adaptation of the tools used to carry out work tasks would allow a decrease in the vibration level of this type of machine.

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.

Comparisons of Whole Body Vibration, Muscle Activity and Non-driving Task Performance between Different Seat Suspensions in an Autonomous Passenger Car Application

2018 ◽  
Vol 62 (1) ◽  
pp. 1848-1852
Author(s):  
Kiana Kia ◽  
Peter W Johnson ◽  
Jeong Ho Kim
Keyword(s):  
Task Performance ◽  
Muscle Activity ◽  
Whole Body Vibration ◽  
Active Suspension ◽  
Whole Body ◽  
Low Back ◽  
Motion Platform ◽  
Body Vibration ◽  
Pointing Task ◽  
Driving Task

This study compared whole body vibration (WBV), muscle activity and non-driving task performance between different seat suspension settings in a simulated autonomous passenger car environment. To simulate autonomous vehicle environment, field-measured vibration profiles were recreated on a large-scale 6-degree-of-freedom motion platform. In a repeated-measures laboratory experiment, we measured whole body vibration, muscle activity (neck, shoulder and low back), participants non-driving task performance while participants performed non-driving tasks (pointing task with a laptop trackpad, keyboard typing, web-browsing, and reading) on three different suspension seats mounted on the motion platform: vertical (z-axis) electromagnetic active suspension, multi-axial (lateral (y-axis) and vertical (z-axis)) electromagnetic active suspension, and no suspension (industry standard suspension-less seat for passenger cars). The average weighted vibration [A(8)] and vibration dose value [VDV(8)] showed that the seat measured vibration on both the vertical [A(8) = 0.29 m/s2 and VDV(8) = 10.70 m/s1.75] and multi-axial suspension seats [A(8) = 0.29 m/s2 and VDV(8) = 10.22m/s1.75] were lower than no-suspension seat vibration [A(8) = 0.36 m/s2 and VDV(8) = 12.84 m/s1.75]. Despite the significant differences in WBV between the different suspensions there were no significant differences across three different suspension seats in typing performance (typing speed and accuracy: p’s > 0.83), pointing task performance (movement time and accuracy: p’s > 0.87), web-browsing (number of questions and webpages read: p = 0.42), and reading (number of words read: p = 0.30). The muscle activity in low back (erector spinae) and shoulder (trapezius) muscles also did not show any significant differences (p’s > 0.22). These laboratory study findings indicated that despite the significant reduction in WBV, neither vertical nor multi-axial active suspension seats improve non-driving task performance as compared to the no-suspension seat.

scholarly journals One-way ANOVA model to study whole-body vibration attributes among taxi drivers – An emphasis on the role of speed

2018 ◽  
Vol 37 (1) ◽  
pp. 156-164 ◽  
Author(s):  
Milad Derakhshanjazari ◽  
Mohammad Reza Monazzam ◽  
Seyed Mostafa Hosseini ◽  
Mohammad Saeid Poursoleiman
Keyword(s):  
Whole Body Vibration ◽  
Whole Body ◽  
Vehicle Speed ◽  
Crest Factor ◽  
Worst Case ◽  
Taxi Drivers ◽  
Body Vibration ◽  
Average Value ◽  
Upper Limit ◽  
The Impact

Taxi drivers are daily exposed to frequent and prolonged whole-body vibration. This can cause complications such as back pain among them. Since the vibration level depends on many factors, the present study was performed to model the impact of vehicle speed on the attributes of whole-body vibration among the Peugeot 405 taxi drivers. In this experimental study, the whole-body vibration was measured while other variables including tire pressure, engine speed, road gradient, number of passengers, and type of tire, springs, and shock absorbers had been fixed. The measurements were done according to ISO2631–1 at different speeds of 20, 40, 60, and 80 km/h. Increasing the vehicle speed caused an increase in the average value of vibration attributes including Z-axis (vertical) r.m.s. acceleration, 8-h equivalent acceleration, vibration dose value (m/s1.75), and crest factor (P < 0.05). At the speed of 80 km/h, the average vibration dose value (17.6 m/s1.75) exceeded the upper limit of the ISO 2631–1:1997 health caution zone (>17). Further, 8-h equivalent acceleration, at the speeds of 60 and 80 km/h, was beyond the upper limit (>0.9 m/s2). According to the crest factor, increasing speed would cause greater vibration peaks along the Z-axis (worst-case axis). The amount of whole-body vibration is sensitive to speed changes so that urban taxi drivers who are usually driving at low speeds for inner-city transits will be exposed to a lower average value of whole-body vibration. Due to the evident effect of speed on whole-body vibration attributes, it is strongly recommended to be given full consideration to this factor in preparing vibration control plans for vehicles.

scholarly journals The Impact of Whole Body Vibration Therapy on Spasticity and Disability of the Patients with Poststroke Hemiplegia

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Alev Alp ◽  
Bilge Efe ◽  
Mihriban Adalı ◽  
Adnan Bilgiç ◽  
Sevda Demir Türe ◽  
...  
Keyword(s):  
Functional Outcome ◽  
Whole Body Vibration ◽  
Intervention Group ◽  
Complementary Therapy ◽  
Functional Independence ◽  
Whole Body ◽  
Control Group ◽  
Body Vibration ◽  
Vibration Therapy ◽  
The Impact

Objective. To determine if whole body vibration therapy (WBV) effectively improves functional outcome in patients with poststroke hemiplegia. Materials and Methods. In this single-blind RCT, WBV group (n=10) had 40 hz frequency/4 mm amplitude vibration during 5 minutes/session, 3 days a week, for a duration of 4 weeks. The control group (n=11) had no vibration therapy for the same duration while standing on the same platform. Patients in both of the groups did 15 minutes of stretching and active range of motion exercises before the intervention. Outcome measures were Modified Ashworth Scale (MAS), Functional Independence Measurement (FIM), and Timed 10-Meter Walk Test (10 mWT). Results. Only 10 mWT improved at the 1st week (p=0.002), 1st month (p<0.001), and 3rd month (p<0.001) in favor of the intervention group. There was positive correlation also between 10 mWT and ankle spasticity (p<0.001, r=0.931). Conclusion. This study suggests that WBV therapy may be a complementary therapy in gait rehabilitation and functional outcome of the patients with calf muscle spasticity.

scholarly journals Twelve Weeks of Whole Body Vibration Training Improve Regucalcin, Body Composition and Physical Fitness in Postmenopausal Women: A Pilot Study

2020 ◽  
Vol 17 (11) ◽  
pp. 3940 ◽  
Author(s):  
Jorge Pérez-Gómez ◽  
José Carmelo Adsuar ◽  
Miguel Ángel García-Gordillo ◽  
Pilar Muñoz ◽  
Lidio Romo ◽  
...  
Keyword(s):  
Body Composition ◽  
Bone Mass ◽  
Physical Fitness ◽  
Postmenopausal Women ◽  
Fat Mass ◽  
Lean Mass ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Body Vibration ◽  
The Impact

(1) Background: Regucalcin or senescence marker protein 30 (SMP30) is a Ca2+ binding protein discovered in 1978 with multiple functions reported in the literature. However, the impact of exercise training on SMP30 in humans has not been analyzed. Aging is associated with many detrimental physiological changes that affect body composition, functional capacity, and balance. The present study aims to investigate the effects of whole body vibration (WBV) in postmenopausal women. (2) Methods: A total of 13 women (aged 54.3 ± 3.4 years) participated in the study. SMP30, body composition (fat mass, lean mass, and bone mass) and physical fitness (balance, time up and go (TUG) and 6-min walk test (6MWT)) were measured before and after the 12 weeks of WBV training. (3) Results: The WBV training program elicited a significant increase in SPM30 measured in plasma (27.7%, p = 0.004) and also in 6MWT (12.5%, p < 0.001). The WBV training also significantly reduced SPM30 measured in platelets (38.7%, p = 0.014), TUG (23.1%, p < 0.001) and total body fat mass (4.4%, p = 0.02). (4) Conclusions: There were no significant differences in balance, lean mass or bone mass. The present study suggests that 12 weeks of WBV has the potential to improve SPM30, fat mass, TUG and 6MWT in postmenopausal women.

scholarly journals Effects of Whole-Body Vibration Training on Lower Limb Blood Flow in Children with Myelomeningocele—A Randomized Trial

2021 ◽  
Vol 10 (18) ◽  
pp. 4273
Author(s):  
Małgorzata Domagalska-Szopa ◽  
Andrzej Szopa ◽  
Andrzej Siwiec ◽  
Ilona Kwiecień-Czerwieniec ◽  
Lutz Schreiber ◽  
...  
Keyword(s):  
Blood Flow ◽  
Lower Limb ◽  
Whole Body Vibration ◽  
Lower Limbs ◽  
Whole Body ◽  
Control Group ◽  
Body Vibration ◽  
Conventional Physiotherapy ◽  
Whole Body Vibration Training ◽  
The Impact

The objective of the present study was to determine the effectiveness of a three-week Whole-Body Vibration (WBV) training on the vascular blood flow of the lower limbs in children with myelomeningocele. The secondary goal was to evaluate the effect of WBV on the ROM of lower limb joints in this population. A total of 30 children with MMC (7–16 years old) were enrolled in the study. Children were randomly allocated to two groups of equal numbers, using an envelope code. The experimental group underwent a 3-week WBV training, while the control group received a 3-week conventional physiotherapy (PT) program. The examination consisted of two parts: (1) Doppler USG examination of the lower limb vascular blood flow; (2) evaluation of ROM. The results obtained revealed three main findings. First, WBV training effectively improved blood flow by increasing flow velocities in all tested arteries, while the impact of the PT program was limited to a single parameter. Second, WBV training effectively improved vascular resistance in arteries of the lower legs, while the PT program did not achieve any significant differences. Third, both types of treatment intervention significantly improved ROM in all joints of the lower limbs in MMC participants.

scholarly journals Acute effects of whole body vibration on functional capabilities of skeletal muscle (Los efectos agudos de la vibración corporal total sobre las capacidades funcionales del músculo esquelético)

Retos ◽  
2015 ◽  
pp. 180-183
Author(s):  
James D. Burns ◽  
Paul C. Miller ◽  
Eric E. Hall
Keyword(s):  
Vertical Jump ◽  
Anaerobic Power ◽  
Whole Body Vibration ◽  
Average Power ◽  
Peak Torque ◽  
Whole Body ◽  
Body Vibration ◽  
Vibration Condition ◽  
The Impact ◽  
Athlete Group

The focus of this research was to evaluate the effect whole body vibration (WBV) on measures of muscular contractile function. In addition, this research was conducted to compare the effects of WBV on athletes versus non-athletes. Nineteen male, non-athlete college students, as well as eighteen male Division I collegiate athletes participated in this research. All participants completed 2 conditions, vibration and no vibration, in a randomized order. Participants were exposed to either a 2-minute bout of vibration or a 2-minute no vibration condition. Immediately following both conditions, participants were tested for peak vertical jump height, isokinetic peak torque and average power of knee extensors and flexors, and anaerobic power during a 30-second maximal effort cycle task.  Results  showed  a  significant  improvement  in  knee  flexion peak torque at 6.28 rad·sec-1 in the athlete group following the vibration condition. Results also showed a trend toward a significant improvement in knee extensor and knee flexor average power at 6.28 radΧsec-1 in the athlete group following the vibration condition. There were no significant changes in any isokinetic measure for the non-athlete group. There were no significant changes in vertical jump or anaerobic power for either group. This may be due in part to the complexity of the dose-response relationship, which is largely dictated by the parameters of vibration frequency, amplitude, and duration. However, previous studies have found positive results using similar protocols as the present study. Practically speaking, the use of WBV prior to exercise may result in facilitated contractile and athletic performance. Consequently, this study sought to describe the impact of using WBV prior to exercise on muscle function.Key Words. Performance enhancement; Athletes; Power; Muscle Performance.Resumen. El objetivo de esta investigaciσn fue evaluar el efecto de la vibraciσn de cuerpo entero (WBV) sobre parαmetros de la funciσn contrαctil muscular. Ademαs, esta investigaciσn se realizσ para comparar los efectos de la WBV en atletas en comparaciσn con no atletas. Diecinueve hombres, estudiantes universitarios no deportistas, asν como 18 hombres, atletas de Divisiσn I universitaria participaron en esta investigaciσn. Todos los participantes completaron dos condiciones en orden aleatorio: la vibraciσn y la ausencia de vibraciσn. Los participantes fueron expuestos a 2 min de vibraciσn o una condiciσn de no vibraciσn por dos minutos. Inmediatamente despuιs de ambas condiciones, a los participantes se les midiσ la altura pico de salto vertical, el torque pico isocinιtico, la potencia media de extensores y flexores de la rodilla y la potencia anaerσbica durante una tarea de ciclo de esfuerzo mαximo 30 s. Los resultados muestran una mejorνa significativa en el torque pico de la rodilla a 6.28 rad·sec-1 en el grupo de deportistas luego de la condiciσn de vibraciσn. Los resultados tambiιn muestran una tendencia hacia un aumento significativo en la potencia promedio de los flexores y extensores de la rodilla a 6.28 rad·sec-1 en el grupo de deportistas luego de la condiciσn de vibraciσn. No hubo cambios significativos en las variables isocinιticas en el grupo de no atletas. Tampoco hubo cambios significativos en el salto vertical ni en la potencia anaerσbica en ambos grupos. Esto puede explicarse en parte a la complejidad de la relaciσn de dosis-respuesta, la cual estα ampliamente determinada por los parαmetros de frecuencia, amplitud y duraciσn de la vibraciσn. Sin embargo, estudios previos han encontrado resultados positivos utilizando protocolos similares a los del presente estudio. En tιrminos prαcticos, el uso de WBV antes del ejercicio puede resultar en una mejor contractilidad y rendimiento deportivo. En consecuencia, este estudio tratσ de describir el impacto del uso de WBV antes del ejercicio en la funciσn muscular.Palabras claves. mejora del rendimiento, atletas, potencia, rendimiento muscular

Whole-Body Vibration Exposure Experienced by Subway Train Operators

1994 ◽  
Vol 13 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Nihat Ozkaya ◽  
Bernardus Willems ◽  
David Goldsheyder ◽  
Margareta Nordin
Keyword(s):  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Exposure Limits ◽  
Mechanical Vibrations ◽  
Body Vibration ◽  
International Standard ◽  
Train Speed ◽  
Exposure Levels ◽  
Subway Train

Purposes of the study were to measure mechanical vibrations transmitted to train operators, to calculate daily whole-body vibration exposure levels, to compare measured levels with maximum acceptable exposure levels according to the international standard on whole-body vibration, to identify factors that influence vibration levels, and to quantify the effects of these factors on the measured levels. As a result of this study, it was determined that six out of twenty subway lines had vibration levels higher than the daily exposure limits recommended by the international standard, and that train speed was the most significant factor influencing the vibration levels.

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