Postural stability when walking: Effect of the frequency and magnitude of lateral oscillatory motion

Sari, Hatice Mujde; Griffin, Michael J.

doi:10.1016/j.apergo.2013.04.012

Cited by 14 publications

(20 citation statements)

References 21 publications

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“…This study created this scenario for testing, it was considered the misuse scenario. The platform motions caused by the fall-arrest conditions evaluated in this study similar to or worse than those found in the aforementioned research (Wertheim, 1998, Sari and Griffin, 2014, and Duncan et al, 2014). …”

Section: 0 Discussion and Conclusionsupporting

confidence: 81%

“…Lateral sinusoidal oscillations from 0.5–2 hertz and accelerations from 0.1–2.0 m/s 2 (0.33–6.56 ft/s 2 ) were shown to cause postural instability and the perceived risk of falling (Sari and Griffin, 2014). Repeated exposures to platform motions can also affect the human response—more exposure to the movement the better the adaptation to the movement (Duncan et al, 2014).…”

Section: 0 Discussion and Conclusionmentioning

confidence: 99%

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Evaluating the stability of a freestanding Mast Climbing Work Platform

Wimer

Pan

Lutz

et al. 2017

Journal of Safety Research

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Mast Climbing Work Platforms (MCWPs) are becoming more common at construction sites and are being used as an alternative to traditional scaffolding. Although their use is increasing, little to no published information exists on the potential safety hazards they could pose for workers. As a last line of defense, a personal fall-arrest system can be used to save a worker in a fall incident from the platform. There has been no published information on whether it is safe to use such a personal fall-arrest system with MCWPs. In this study, the issues of concern for occupational safety included (1) the overall stability of the freestanding mast climber during a fall-arrest condition and (2) whether that fall-arrest system could potentially present safety hazards to other workers on the platform during a fall-arrest condition. This research project investigated those safety concerns with respect to the mast climber stability and the workers using it by creating fall-arrest impact forces that are transmitted to the equipment and by subsequently observing the movement of the mast climber and the working deck used by the workers. This study found that when the equipment was erected and used according to the manufacturer’s recommendations during a fall-arrest condition, destabilizing forces were very small and there were no signs of potential of MCWP collapse. However, potential fall hazards could be presented to other workers on the platform during a fall arrest. Workers near an open platform are advised to wear a personal fall-arrest system to reduce the risk of being ejected. Due to the increasing use of MCWPs at construction sites, there is a corresponding need for evidence and science-based safety guidelines or regulations. To fill the knowledge gap, this research begins to investigate the effects of fall-arrest on the overall stability of a freestanding MCWP and workers while wearing a personal fall-arrest system.

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Section: 0 Discussion and Conclusionsupporting

confidence: 81%

Section: 0 Discussion and Conclusionmentioning

confidence: 99%

Evaluating the stability of a freestanding Mast Climbing Work Platform

Wimer

Pan

Lutz

et al. 2017

Journal of Safety Research

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“…Control of balance, or postural stability, is essential in all static and dynamic activities [5]. Maintaining balance is more challenging when there are external disturbances from motion of the floor, such as when standing or walking in a moving train, bus, aircraft or ship [6]. Healthy subjects who experience a sudden postural disturbance while standing recover postural stability using appropriate movement strategies involving agonist and antagonist muscle groups according to the environmental context [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Postural Stability Using Motion Analysis Techniques

Majerník

Živčák

2015

Studies in Computational Intelligence

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The most of the posture stability tests are based on comparison of clinical trials realized in two different conditions, i.e. with and without visual information about surrounding environment. Such tests are performed with eyes open, fixed on certain point in front of the subject, and with eyes closed. The acquired results give us opportunity to understand individual diseases of vestibular system in more details. The main aim of this research study was to integrate the human motion analysis methods to evaluate postural stability and balance control mechanisms in patients with vestibular diseases. A marker-free analysis system was used to detect and evaluate motion of anatomical landmarks in single video camera records. Pilot study was realized at the group of 22 patients to verify both the system functionality and the methodology suitability. All here included patients were evaluated separately as first, because of their different impairments affecting postural control. Then, the results were analysed within the group of here included patients as well. The first results showed that the method was efficient and proved quantitative changes in posture stability parameters as well as their dependence on visual perception. Also, the results obtained in patients with similar symptoms convinced us that the increasing number of analysed subjects and thus increasing database of patients data could help clinicians to identify the background of closely related groups of posture disorders as well as to improve the patients health status by supporting of decision making process aimed to select optimal treatment.

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“…14 With sinusoidal oscillation of a platform in the mediolateral axis of walking subjects, their postural stability was similar when motions had the same velocity, irrespective of the frequency of oscillation in the range 0.5 to 2 Hz. 15 Apart from quantifying motions to predict walking instability, discomfort or difficulty, postural stability research has also sought metrics to identify walking balance. Understanding how people maintain stability when walking, particularly when exposed to perturbations, is key to preventing falls, but there is no universally accepted measure of stability.…”

Section: Introductionmentioning

confidence: 99%

Postural Stability When Walking and Exposed to Mediolateral Oscillatory Motion: Effect of Oscillation Waveform

Ayık

Griffin

2019

Journal of Applied Biomechanics

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Postural stability can be threatened by the low frequency motions in transport that are usually quantified by their root-mean-square (r.m.s.) acceleration. This study investigated how the stability of walking people depends on the waveform of 1-Hz and 2-Hz mediolateral oscillations of the surface on which they walk. Walking on a treadmill, 20 subjects were perturbed by random oscillations of the treadmill with one-third octave bandwidths: different waveforms with the same r.m.s. acceleration and different waveforms with the same peak acceleration. Stability was measured subjectively and objectively by the velocity of the centre of pressure in the mediolateral direction. Subjective and objective measures of walking instability increased with increasing r.m.s. acceleration of oscillations having the same peak acceleration. These same measures of instability were also affected by the peak acceleration when the r.m.s. magnitude of the oscillations was constant, especially with 1-Hz oscillations. It is concluded that r.m.s. measures of acceleration are insufficient to predict the postural stability of walking passengers exposed to mediolateral oscillations and that peaks in the oscillations should also be taken into account.

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Postural stability when walking: Effect of the frequency and magnitude of lateral oscillatory motion

Cited by 14 publications

References 21 publications

Evaluating the stability of a freestanding Mast Climbing Work Platform

Evaluating the stability of a freestanding Mast Climbing Work Platform

Evaluation of Postural Stability Using Motion Analysis Techniques

Postural Stability When Walking and Exposed to Mediolateral Oscillatory Motion: Effect of Oscillation Waveform

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