Effects of horizontal whole-body vibration and standing posture on activity interference

Baker, William David Richard; Mansfield, Neil J.

doi:10.1080/00140130903402242

Cited by 24 publications

(14 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In congruence with previous MII research (e.g., Baker & Mansfield, 2010;Brown et al, 2001), this study shows that MII occurrence increases by increasing peak sway acceleration consistently in all motion conditions.…”

Section: Discussionsupporting

confidence: 76%

“…These motion parameters are comparable to what is found in vessels like the FFG-7 frigate (Morrison, Dobie, Willems, Webb, & Endler, 1991) or in earlier MII research (Crossland & Lloyd, 1993). The duration of the motion session, approximately one hour, is comparable to that used in earlier MII research (Baker & Mansfield, 2010;Crossland & Lloyd, 1993;Crossland & Rich, 1998). …”

Section: External Validity Of Motion Profilesmentioning

confidence: 51%

“…The central role of acceleration in postural responses, and the association between acceleration and MIIs, is known and well established in the literature (Baker & Mansfield, 2010;Brown, Jensen, Korff, & Woollacott, 2001). …”

Section: B Miis Versus Motion Amplitude and Frequencymentioning

confidence: 99%

See 2 more Smart Citations

Motion-Induced Interruptions and Postural Equilibrium in Linear Lateral Accelerations

Matsangas¹,

McCauley²

2013

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S)12. DISTRIBUTION / AVAILABILITY STATEMENT Approved for public release; distribution is unlimited 13. SUPPLEMENTARY NOTES The views expressed in this report are those of the authors and do not reflect the official policy or position of the Department of Defense or the U.S. Government. ABSTRACTThe scope of this applied research was to conduct an experiment using a motion simulator in order to (a) revisit the relationship between sway parameters and Motion-Induced Interruptions (MIIs) in a controlled environment, and (b) focus on the effect of the frequency (period) of the acceleration stimulus on MII occurrence.This study assesses lateral tipping, as opposed to sliding, MIIs of standing persons in a simulated motion environment representing dry deck conditions. Results verify previous findings that MII occurrence increases with increasing peak sway acceleration. Although MII occurrence was associated with the frequency of the motion stimulus, the effect is not as clear as that of acceleration. Overall, results suggest that complex, multidirectional motions create more tipping MIIs than unidirectional motion. Beyond acceleration, MII research also should incorporate frequency characteristics and motion complexity as factors influencing MII occurrence.In this study, we introduce the "probable" MII, a novel term referring to a slight, temporary loss of balance without tipping. This term fills the gap between the theoretical definition of an MII and a human-centered perception of an MII, where loss of balance is not a binary phenomenon. From a human performance perspective, the investigation of the "probable" MIIs may be of a value because they are more common than the "definite" MIIs (depending on the motion profile, this difference ranged from 16% to 67%).As a result of these findings, we developed a mathematical model of MII occurrence based on the amplitude and period of motion stimulus acceleration. The model assumes an additive combination two functions: a generalized logistic associated with the amplitude of acceleration and a Gaussian for period. The developed model approximated the observed MIIs with good results (< +/-9% difference). This study assesses lateral tipping, as opposed to sliding, MIIs of standing persons in a simulated motion environment representing dry deck conditions. Results verify previous findings that MII occurrence increases with increasing peak sway acceleration. SUBJECT TERMSAlthough MII occurrence was assoc...

show abstract

Section: Discussionsupporting

confidence: 76%

Section: External Validity Of Motion Profilesmentioning

confidence: 51%

See 1 more Smart Citation

Motion-Induced Interruptions and Postural Equilibrium in Linear Lateral Accelerations

Matsangas¹,

McCauley²

2013

View full text Add to dashboard Cite

show abstract

“… Elton and Nicole (2013) found that an everyday cold temperature of 5°C had a significant effect on older adults' ability to carry out fine finger tasks and product interactions;  Baker and Mansfield (2010) reported decrements in dexterity when participants were exposed to vibration which could be experienced on public transport; Hopkinson and Collins (1970) reported that the human eye can detect detail ten times as fine in daylight as it can under starlight.…”

Section: And Hadrian (Human Anthropometric Datamentioning

confidence: 99%

Supporting the development of inclusive products: the effects of everyday ambient illumination levels and contrast on older adults' near visual acuity

2013

View full text Add to dashboard Cite

Current older adult capability datasets fail to account for the effects of everyday environmental conditions on capability. This paper details a study which investigates the effects of everyday ambient illumination conditions (overcast, 6000 lx; In-house lighting, 150 lx; and street lighting, 7.5 lx) and contrast (90%, 70%, 50% and 30% contrast) on the near visual acuity of older adults (n=38, 65-87 years). Visual acuity was measured at a one metre viewing distance using LogMAR acuity charts. Results from the study showed that for all contrast levels tested, visual acuity decreased by 0.2 log units between the overcast and street lighting conditions. On average, participants could detect detail around 1.6 times smaller on the LogMAR charts when under overcast conditions compared to street lighting. Visual acuity also significantly decreased when contrast was reduced from 70% to 50%, and from 50% to 30% in each of the ambient illumination conditions. Practitioner summary: This paper presents an experimental study which investigates the impact of everyday ambient illumination levels and contrast on older adults' visual acuity. Results show both factors have a significant effect on their visual acuity. Findings suggest that environmental conditions need to be accounted for in older adult capability datasets/design.

show abstract

“…When the horizontal WBV was applied while the participants stood with their feet apart, the horizontal vibration caused an antero-posterior weight bearing (Baker & Mansfield, 2010;Griffin & Hayward, 1994), and an increase in muscle activity to maintain the position, which exerted positive effects on the improvement of stability. Likewise, the horizontal WBV may have positive effects on the body, including muscle activation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of trunk and lower extremity electromyographic activity in horizontal whole-body vibration

Song

Kim

Seunghee

et al. 2017

jhse

View full text Add to dashboard Cite

Whole-Body Vibration (WBV) has been extensively investigated as a widely used training tool. However, previous studies mostly applied the WBV on synchronous or side alternating vibration platform devices. The present study was aimed to investigate the electromyographic activity of trunk and lower-extremity muscles as one stands on a flat floor, and during horizontal whole-body vibration (WBV). This was a comparative cross-sectional study. Sixteen healthy adults participated in the study. The electromyographic activity of the trunk and lower extremity muscles was collected while the participants stood on either a flat floor or a WBV device moving horizontally. Electromyography (EMG) was used to record the activity of trunk and lower extremity muscles (erector spinae, rectus abdominalis, rectus femoris, biceps femoris, tibialis anterior, and gastrocnemius). The rectus femoris, tibialis anterior, and gastrocnemius muscles showed significantly higher muscle activation on the horizontal WBV device than on the flat floor (p<0.05). In particular, the electromyographic activity of Lt. rectus femoris (23.0 vs 14.3), Rt. rectus femoris (32.7 vs 15.1), Lt. tibiailis anterior (19.0 vs 9.8) Rt. tibiailis anterior (17.8 vs 7.9), and of the Lt. gastrocnemius (41.5 vs 15.7), Rt. gastrocnemius (32.7 vs 13.0) increased on the horizontal WBV device than on the flat floor. The muscle activity of the rectus femoris, tibialis anterior, and gastrocnemius muscles proved to be higher when the participants stood on the WBV device vibrating in a horizontal direction than on the flat floor. Further studies need to investigate the clinical applicability of horizontal WBV.

show abstract

Effects of horizontal whole-body vibration and standing posture on activity interference

Cited by 24 publications

References 14 publications

Motion-Induced Interruptions and Postural Equilibrium in Linear Lateral Accelerations

Motion-Induced Interruptions and Postural Equilibrium in Linear Lateral Accelerations

Supporting the development of inclusive products: the effects of everyday ambient illumination levels and contrast on older adults' near visual acuity

Analysis of trunk and lower extremity electromyographic activity in horizontal whole-body vibration

Contact Info

Product

Resources

About