Psychophysical estimate of plantar vibration sensitivity brings additional information to the detection threshold in young and elderly subjects

Jammes, Yves; Guimbaud, Julia; Faure, Rémi; Griffon, Patricia; Weber, Jean Paul; Vie, Bruno; Guieu, Régis

doi:10.1016/j.cnp.2016.03.002

Cited by 5 publications

(14 citation statements)

References 21 publications

(40 reference statements)

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“…As in our previous study [13], we found that the sole determination of the vibration threshold gave less information than the Stevens power function did. Indeed, an increased skin hardness was only associated to an elevated vibration threshold at the 25 Hz vibration frequency while the k coefficient of the Stevens power function was affected at both the 25 and 150 Hz frequencies.…”

Section: Discussionmentioning

confidence: 44%

“…This could explain the absence of any significant correlation between the perceptual vibration threshold and the skin hardness. Second, the authors only measured the vibration threshold and the present study, as our previous one [13], clearly showed a poor discriminating power of the sensitivity threshold.…”

Section: Discussionmentioning

confidence: 87%

“…The method was largely described in our previous study [13]. The participants sat comfortably with their eyes closed and wore head phones to eliminate auditory cues associated with the onset of the vibration.…”

Section: Measurements Of Vibratory Sensationsmentioning

confidence: 99%

“…However, this interesting study was limited to measurements of perceptual thresholds. In previous studies, we used the Stevens psychological law [11] to obtain estimate of tactile stimuli [12] or mechanical vibrations [13] in a wide range of amplitude and found that this approach brought further information than the sole detection threshold.…”

Section: Introductionmentioning

confidence: 99%

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Skin Hardness and Epidermal Thickness Affect the Vibration Sensitivity of the Foot Sole

Jammes¹,

Viala²,

Weber³

et al. 2017

Clin Res Foot Ankle

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Objective: The cutaneous mechanoreceptors of the foot sole detect the changes in the application of mechanical loads on the plantar surface during gait and standing, and contribute to controlling the standing balance and postural reflexes in healthy subjects. A local thickening of the foot sole skin occurs in response to repetitive load application. We hypothesized that an elevated skin hardness of the foot sole could reduce its mechano sensitivity. Methods:In healthy subjects, we quantified the sensation produced by different amplitudes of vibratory stimulations at two frequencies (25 and 150 Hz). The vibration threshold was determined on the 1 st or 2 nd , and 5 th metatarsal heads, and the heel at each vibration frequency. The Stevens power function (Ψ=k.Φ n ) allowed to obtain regression equations between the estimate (Ψ) of the vibratory stimuli and their physical magnitude (Φ). Any increase in the absolute k value (all were negative) indicated a reduced sensitivity to the lowest loads. The n coefficient measured the global perception. The highest skin hardness (Shore) was measured on the 5th metatarsal head and the heel. In some subjects, superficial skin abrasion of the 5 th metatarsal head was performed and the vibration sensitivity was tested again. Results:The vibration threshold was significantly higher at the level of the 5 th metatarsal head and the heel. The k value was significantly higher at the 25 and 150 Hz frequencies for the 5 th metatarsal head, and only at 25 Hz for the heel. At both vibration frequencies, negative correlations were obtained between the k values and skin hardness. After skin abrasion, the n coefficient was significantly higher at both vibration frequencies. Conclusion:Skin hardness affects the foot sole mechano sensitivity and could alter the control of posture during standing and walking. This indicates that foot care by podiatrist are relevant to improve posture control.

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Section: Discussionmentioning

confidence: 44%

Section: Discussionmentioning

confidence: 87%

Section: Measurements Of Vibratory Sensationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Skin Hardness and Epidermal Thickness Affect the Vibration Sensitivity of the Foot Sole

Jammes¹,

Viala²,

Weber³

et al. 2017

Clin Res Foot Ankle

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“…The activation of the cutaneous afferents gives perceptual information that reveals relationships between the estimate of the vibratory stimuli and their physical magnitude. This was confirmed for the mechanosensitivity of the hand [ 18 ] and the foot sole [ 15 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 72%

Adding body load modifies the vibratory sensation of the foot sole and affects the postural control

Jammes

Ferrand²,

Fraud³

et al. 2018

Military Med Res

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BackgroundHeavy backpacks are often used by soldiers and firefighters. Weight carrying could reduce the speed and efficiency in task completion by altering the foot sole sensitivity and postural control.MethodsIn fifteen healthy subjects, we measured the changes in sensitivity to vibrations applied to the foot sole when standing upright or walking after load carrying (30% body weight). The participants were asked to judge different vibration amplitudes applied on the 2nd or 5th metatarsal head and the heel at two frequencies (25 and 150 Hz) to determine the vibration threshold and the global perceptual representation (Ѱ)of the vibration amplitude (Ф) given by the Stevens power function (Ѱ = k × Фn). Any increase in negative k value indicated a reduction in sensitivity to the lowest loads. Pedobarographic measurements, with computation of the center of pressure (COP) and its deviations, were performed during weight carrying.ResultsThe 25-Hz vibration threshold significantly increased after weight carrying when standing upright or walking. After standing with the added loads, the absolute negative k value increased for the 25 Hz frequency. After walking with the added loads, the k coefficient increased for the two vibration frequencies. Weight carrying significantly increased both the CoP surface and CoP lateral deviation.ConclusionsOur data show that weight carrying reduces the sensory pathways from the foot sole and accentuates the center of pressure deviations.

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Simultaneous Measurement of Skin Deformation and Perceptual Sensitivity Using Suction Pressure

Saito

Konyo

Nagano

et al. 2019

2019 IEEE World Haptics Conference (WHC)

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Psychophysical estimate of plantar vibration sensitivity brings additional information to the detection threshold in young and elderly subjects

Abstract: HighlightsPsychophysical estimate of plantar vibration perception (n coefficient) was obtained.In all subjects higher n values were measured at the 150 Hz vibration frequency.n values bring complementary information of vibration detection threshold.

Cited by 5 publications

References 21 publications

Skin Hardness and Epidermal Thickness Affect the Vibration Sensitivity of the Foot Sole

Skin Hardness and Epidermal Thickness Affect the Vibration Sensitivity of the Foot Sole

Adding body load modifies the vibratory sensation of the foot sole and affects the postural control

Simultaneous Measurement of Skin Deformation and Perceptual Sensitivity Using Suction Pressure

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