Design and evaluation of vibratory shoe on balance control for elderly subjects: technical note

Aboutorabi, Atefeh; Arazpour, Mokhtar; Farahmand, Farzam; Bahramizadeh, Mahmood; Fadayevatan, Reza; Abdollahi, Ehsan

doi:10.1080/17483107.2017.1300346

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…This comparison examined SR responses between glabrous and hairy skin, in which the test location for the input vibration was the heel (15% of the posterior-to-anterior length of the foot to the base of the toes) and the location of the noise application was the calf (15 cm above the calcaneus) (see Figure 1B ). The heel location was chosen to test the SR response because it has been shown previously to evoke an SR effect ( Khaodhiar et al, 2003 ; Priplata et al, 2003 ; Aboutorabi et al, 2017 ), which allows for comparison with less sensitive hairy skin. For the age comparison, 15 healthy participants were recruited (7 females and 8 males, with an average age of 62 ± 5 years, an average height of 1.717 ± 0.1072 m and an average weight of 75.5 ± 14.29 kg) (“OLD” group).…”

Section: Methodsmentioning

confidence: 99%

“…SR has been shown to improve perception of a tactile stimulus in the glabrous skin of the hand ( Collins et al, 1997 ; Richardson et al, 1998 ; Kurita et al, 2013 ; Iliopoulos et al, 2014 ) and foot ( Dhruv et al, 2002 ; Khaodhiar et al, 2003 ; Wells et al, 2005 ). It has also been shown to improve proprioception at the lower extremity ( Collins et al, 2009 ) as well as various measures of balance and gait ( Dettmer et al, 2015 ; Aboutorabi et al, 2017 ) in healthy individuals, older individuals and those with various sensory conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Noise has been shown to be effective in older adults at improving perception ( Dhruv et al, 2002 ; Liu et al, 2002 ; Breen et al, 2016 ) and balance measures ( Gravelle et al, 2002 ; Costa et al, 2007 ; Lipsitz et al, 2015 ; Zhou et al, 2016 ; Aboutorabi et al, 2017 ). Research has shown, in fact, that noise is more effective in the elderly than in the young at improving some postural outcomes ( Priplata et al, 2003 ; Dettmer et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

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Remote Subthreshold Stimulation Enhances Skin Sensitivity in the Lower Extremity

Plater

Seto

Peters

et al. 2021

Front. Hum. Neurosci.

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Foot sole skin interfaces with the ground and contributes to successful balance. In situations with reduced sensitivity in the glabrous foot skin, stochastic resonance (SR) improves skin sensitivity by adding tactile noise. Some situations, however, involve an interface comprised of hairy skin, which has higher thresholds for sensitivity. For example, in lower extremity amputation the residual limb is comprised of hairy leg skin. The main objective of this study was to determine if SR improves skin sensitivity in hairy skin, and whether a specific intensity of noise is most effective. Secondary objectives were to compare the effect between locations, ages and modalities. In 60 healthy participants a vibrotactile (test) input was delivered at the lower extremity concurrently with a second, noisy stimulus applied more proximally. The presence of a remote SR effect was tested in 15 young participants using electrotactile noise at the calf. Secondary objectives were tested in separate groups of 15 subjects and differed by substituting for one of the three variables: vibrotactile noise, heel site, and with older participants. A forced-choice protocol was used to determine detection ability of the subthreshold vibration test input with varying noise levels applied simultaneously (0, 20, 40, 60, 80, and 100% of perceptual threshold). An SR effect was identified when increased detection of the input was obtained at any level of noise versus no noise. It was found that all four test groups demonstrated evidence of SR: 33–47% of individuals showed better detection of the input with added noise. The SR effect did not appear consistently at any specific noise level for any of the groups, and none of the variables showed a superior ability to evoke SR. Interestingly, in approximately 33% of cases, threshold values fluctuated throughout testing. While this work has provided evidence that SR can enhance the perception of a vibrotactile input in hairy skin, these data suggest that the ability to repeatably show an SR effect relies on maintaining a consistent threshold.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Remote Subthreshold Stimulation Enhances Skin Sensitivity in the Lower Extremity

Plater

Seto

Peters

et al. 2021

Front. Hum. Neurosci.

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“…We used G*Power Version 3.1.9.2 software (Heinrich-Heine University, Düsseldorf, Germany) to calculate the sample size. Based on pilot study on four subjects, 15 alpha error of 0.05, a sample size of 12 for each group was required. This sample size would also provide 80% power with an effect size of 0.77.…”

Section: Methodsmentioning

confidence: 99%

“…A full description of the shoe with vibration mechanism (Figure 1) has been previously published. 15 A three-layered vibratory shoe was molded with rigid synthetic foam (shore A 55). Eight vibrating elements (6 mm thickness microcylindrical vibration motors, South Korea) were embedded in the middle layer of the shoes to transmit vibrations to the foot plantar surface.…”

Section: Vibratory Shoementioning

confidence: 99%

Effect of Subsensory Vibration on Postural Control of Healthy Elderly and Subjects with Simulated Reduced Plantar Feet Sensation: A Randomized Crossover Controlled Trial

Aboutorabi,

Arazpour,

Hadadi

et al. 2023

J Prosthet Orthot

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Introduction Postural instability is considered a normal result of aging and is caused by some diseases such as neuropathy. Aim The purpose of the present study was to analyze and compare the effect of subthreshold vibration that was applied to the plantar surface of feet on balance control of healthy elderly and young subjects with simulated decreased plantar feet sensation. Methods Twenty-four subjects (12 elderly persons and 12 young persons with decreased plantar feet sensation) were included in this randomized, double-blinded crossover study. Participants were divided into two intervention groups: 1) orthopedic shoe with vibration mechanism on; and 2) orthopedic shoe with vibration off. Primary outcomes were center of pressure (COP) parameters including mean velocity, phase plane portrait, standard deviation (SD) of amplitude, and SD of velocity. Secondary outcomes were Berg Balance Scale (BBS) score and timed up and go test (TUG). The standing balance was tested with different conditions: eye opened/closed and foam/rigid surface. General linear mixed models tests were used for statistical analysis. The level of statistical significance was set at 0.05 for all analyses. Discussion This study showed very large effect sizes (partial η2 > 0.2) with application of vibration as compared with vibration off for COP parameters with greater effects in condition with more baseline fluctuations. There was significant change in BBS test (Cohen d, 0.6; confidence interval [CI], −0.215 to −1.421). The time on TUG test was decreased and approached significance (P = 0.06). Conclusions The immediate effect of the study showed that subthreshold vibration can improve static and dynamic balance in healthy elderly people and people with decreased plantar feet sensation. However, long-term studies are needed to establish the clinical value of the subthreshold vibration on balance control. Clinical Relevance Subthreshold vibration applied to the feet soles via custom-made shoes can reduce the postural sway in subjects with decreased feet sensation. By conducting more studies with conclusive results in the field of vibration effectiveness in the elderly, we can hope to reduce the rate of falls in the elderly.

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Stability Limits for Vertical Vibrations of Paraplegic Subjects while Using Passive Orthosis

Keyvanara

Sadigh

Esfahanian

2020

J. Vib. Eng. Technol.

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Design and evaluation of vibratory shoe on balance control for elderly subjects: technical note

Cited by 7 publications

References 21 publications

Remote Subthreshold Stimulation Enhances Skin Sensitivity in the Lower Extremity

Remote Subthreshold Stimulation Enhances Skin Sensitivity in the Lower Extremity

Effect of Subsensory Vibration on Postural Control of Healthy Elderly and Subjects with Simulated Reduced Plantar Feet Sensation: A Randomized Crossover Controlled Trial

Stability Limits for Vertical Vibrations of Paraplegic Subjects while Using Passive Orthosis

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