Discomfort of seated persons exposed to low frequency lateral and roll oscillation: Effect of backrest height

Beard, George; Griffin, Michael J.

doi:10.1016/j.apergo.2015.11.010

Cited by 17 publications

(7 citation statements)

References 24 publications

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“…Long-term exposure to a whole body vibration (WBV) stimulus was studied to obtain information about the increased health risk to which certain classes of workers are exposed daily (Bovenzi, 2015;Griffin, 2015;Krajnak, 2018). It has been reported that exposure to mechanical vibration, over prolonged periods of time, increases the risk to the health of the spinal column and peripheral nervous system, as well affects, although to a lesser extent, the digestive system, the female reproductive system, and the vestibular system (Bovenzi, 2006;Bovenzi et al, 2011;Beard and Griffin, 2016;Stoyneva et al, 2016;Charles et al, 2018;Yilmaz and Ila, 2019).…”

Section: Introductionmentioning

confidence: 99%

Dose–Response Effect of Vibratory Stimulus on Synaptic and Muscle Plasticity in a Middle-Aged Murine Model

et al. 2021

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Whole body vibration plays a central role in many work categories and can represent a health risk to the musculoskeletal system and peripheral nervous system. However, studies in animal and human models have shown that vibratory training, experimentally and/or therapeutically induced, can exert beneficial effects on the whole body, as well as improve brain functioning and reduce cognitive decline related to the aging process. Since the effects of vibratory training depend on several factors, such as vibration frequency and vibration exposure time, in this work, we investigated whether the application of three different vibratory protocols could modulate synaptic and muscle plasticity in a middle-aged murine model, counteracting the onset of early symptoms linked to the aging process. To this end, we performed in vitro electrophysiological recordings of the field potential in the CA1 region of mouse hippocampal slices, as well as histomorphometric and ultrastructural analysis of muscle tissue by optic and transmission electron microscopy, respectively. Our results showed that protocols characterized by a low vibration frequency and/or a longer recovery time exert positive effects at both hippocampal and muscular level, and that these effects improve significantly by varying both parameters, with an action comparable with a dose–response effect. Thus, we suggested that vibratory training may be an effective strategy to counteract cognitive impairment, which is already present in the early stages of the aging process, and the onset of sarcopenia, which is closely related to a sedentary lifestyle. Future studies are needed to understand the underlying molecular mechanisms and to determine an optimal vibratory training protocol.

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Section: Introductionmentioning

confidence: 99%

Dose–Response Effect of Vibratory Stimulus on Synaptic and Muscle Plasticity in a Middle-Aged Murine Model

et al. 2021

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“…Exposure to WBV is of concern within the workforce because it’s associated with the development of a number of negative health consequences including back and neck pain (Basri,Griffin 2013; Beard,Griffin 2016; Bovenzi 2010, 1996; Charles et al 2018; Du et al 2018; Palmer et al 2012; Bovenzi 2015; Bovenzi et al 1991), and potentially, cardiovascular disease (Hering, Lachowska,Schlaich 2015; Bovenzi 1990), the development of various neuropathies (Bovenzi, Ronchese,Mauro 2011; Bovenzi et al 2004; Stoyneva 2016; Stoyneva et al 2016), digestive problems (Bovenzi 2006, 2005; Ronchese,Bovenzi 2012), headaches, dizziness, motion sickness (Butler,Griffin 2009; Donohew,Griffin 2010; Griffin,Newman 2004; Haward, Lewis,Griffin 2009; Howarth,Griffin 2003; Joseph,Griffin 2007; Webb,Griffin 2003) and possibly cancer (Jones et al 2014; Nadalin et al 2012; Waugh et al 2016; Young et al 2009). However, workers exposed to WBV are often also exposed to a number of other risk factors that may contribute to the development of these negative health effects.…”

Section: Introductionmentioning

confidence: 99%

Health effects associated with occupational exposure to hand-arm or whole body vibration

Krajnak

2018

Journal of Toxicology and Environmental Health, Part B

108

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Workers in a number of different occupational sectors are exposed to workplace vibration on a daily basis. This exposure can come through use of powered-hand tools or hand-transmitted vibration (HTV). Workers can also be exposed to whole body vibration (WBV) by driving delivery vehicles, earth moving equipment, or through the use of tools that generate vibration at low dominant frequencies and high amplitudes, such as jack hammers. Occupational exposure to vibration has been associated with an increased risk of musculoskeletal pain in the back, neck, hands, shoulders and hips. It may also contribute to the development of peripheral and cardiovascular disorders and gastrointestinal problems. In addition, there are more recent data suggesting that occupational exposure to vibration may increase the risk of developing certain cancers. This paper provides a review of the occupations where exposure to vibration is most prevalent, and a description of the health effects associated with occupational exposure to vibration. The various experimental methods used to measure and describe the characteristics of vibration generated by various tools and vehicles, the etiology of vibration-induced disorders, and how these data have been used to assess and improve intervention strategies and equipment that reduces the transmission of vibration to the body. Finally, there is a discussion of the research gaps that need to be investigated to further reduce the incidence of vibration-induced illnesses and injuries.

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“…It is believed that roll vibration will produce greater discomfort than pitch and vertical vibration at the same level and similar frequency [23]. Beard [24][25][26] carried out researches on the subjective response of human body under roll vibration. Results showed that the roll vibration had a great influence on discomfort of seated human body.…”

Section: Introductionmentioning

confidence: 99%

Biodynamic Response of Seated Human Body to Roll Vibration and Correlation between Roll and Lateral Directions

Lin

Zhang

et al. 2020

Shock and Vibration

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Within 30 Hz, the discomfort caused by whole-body vibration in rotational direction is higher than vertical vibration at similar equivalent magnitude. Roll vibration, in particular, produces greater discomfort comparing with pitch and yaw vibrations. It is critical to understand the biodynamic characteristics of seated human body under roll vibration for both comfort assessment and vibration control. Experiments are carried out to obtain the biodynamic response of seated human body under random roll vibrations at four r.m.s. magnitude levels. It is found that the principal resonance in the roll apparent inertia is about 1 Hz, but varied from 0.7 to 1.5 Hz depending on the magnitude of vibration (0.5 to 2.0 rad/s2), and the secondary resonance locates around 3 Hz with a much lower modulus. It is noted that the human response to roll vibration has some features in common with that in the lateral direction. Two lumped parameter models are developed and calibrated to study the correlation between the two excitation axials. The equivalent relationships of magnitude and phase between roll and lateral vibrations are obtained on condition that they produce similar rotational responses of the upper human body. It suggests an equivalence approach between translational and rotational vibrations that can benefit the comfort assessment when exposed to multiaxial excitations.

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Discomfort of seated persons exposed to low frequency lateral and roll oscillation: Effect of backrest height

Cited by 17 publications

References 24 publications

Dose–Response Effect of Vibratory Stimulus on Synaptic and Muscle Plasticity in a Middle-Aged Murine Model

Dose–Response Effect of Vibratory Stimulus on Synaptic and Muscle Plasticity in a Middle-Aged Murine Model

Health effects associated with occupational exposure to hand-arm or whole body vibration

Biodynamic Response of Seated Human Body to Roll Vibration and Correlation between Roll and Lateral Directions

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