Vibration stimulation effect on biomechanical variation of lower-limb joint according to vibration perception threshold

Kwak, Kiyoung; Kim, Huigyun; Song, Kyu Jeong; Kim, Dong-Wook

doi:10.21595/jve.2017.18886

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…We set stimulation frequencies of 180 and 190 Hz, values at which the participants reacted sensitively in previous studies as found using sensory receptors, (29,30) and 250 Hz, at which a rapid increase in the threshold value was observed in this study, as single-frequency VSCs (applied equally to all tendons). In addition, the following frequencies producing the maximum excitability of the sensorimotor cortex in this study were combined as a multifrequency stimulation (MF) condition: ACT: 140 Hz, TAT: 240 Hz, QT: 240 Hz, BT: 160 Hz.…”

Section: Mu Rhythm Change According To Vibration Frequencymentioning

confidence: 97%

Vibratory Somatosensory Stimulus Improves Neuromechanical Task of Stair Climbing by the Elderly

Ko¹,

Kiyoung²,

Pomrop³

et al. 2021

Sensors and Materials

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The purpose of this study was to investigate the influence of sensorimotor-cortex-responsebased vibratory stimulation on stair climbing by the elderly and to reveal the functional assistance effect of vibratory stimulation. To do this, vibratory stimulation conditions (VSCs) were set through the reduction of the mu rhythm, an index of sensorimotor cortex excitability, and applied to elderly people during stair climbing. Joint angle, moment, power, and muscle coactivation (CA) of lower limbs were analyzed to investigate the influence of VSCs on stair climbing. As a result of vibratory stimulation, the biomechanical characteristics of the ankle and hip joints were further developed according to the VSC, and a tendency to compensate the knee joint work appeared. Also, functional improvement of the ankle joint was shown through greater energy transfer from the knee joint to the ankle joint. These results suggested that sensorimotorcortex-response-based vibratory stimulation has the effect of functional assistance of the movement of elderly people and may be useful in research on movement assistance or rehabilitation for people with reduced body functions.

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Section: Mu Rhythm Change According To Vibration Frequencymentioning

confidence: 97%

Vibratory Somatosensory Stimulus Improves Neuromechanical Task of Stair Climbing by the Elderly

Ko¹,

Kiyoung²,

Pomrop³

et al. 2021

Sensors and Materials

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Vibrotactile somatosensory stimulus to assist the transition from level walking to stair ascent in the elderly: a pilot study

Kwak

Kim

2022

BMC Musculoskelet Disord

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Background Although, in daily living, almost all stair ambulation is conducted posterior to level walking, or vice versa, there are only a few studies related to the transition compared to the studies on steady-state stair walking. Furthermore, neuromotor control in the instant of the transition is different from that of the steady-state stair walking. However, there are only a few studies investigating the transition from level walking to stair ascent in the elderly by comparing with young adults, and there is no study on the assistance of the transition movement in the elderly who are experiencing neurophysiological changes. Thus, this pilot study aimed to compare the flat surface-to-stair ascent transition by the elderly to that seen in young adults, and to investigate how vibrotactile somatosensory stimulus (VSS), which has a positive effect on muscle performance and gait, affects the transition tasks in elderly people. Results In the first half of the stance phase, the elderly exhibited a higher moment and power of the hip extensor and a less moment and power of the knee extensor compared with young adults. In the second half of the stance phase, positive plantar-flexor power and support moment was higher in the elderly. In addition, during the single-limb support phase, dorsiflexion was maintained in the elderly, whereas young adults appeared to have decreased dorsiflexion. When the VSS was applied, the moment and power of the hip extensor, the plantar-flexor moment, and the support moment in the entire of the stance phase were increased. In addition, it was found that the degree of the kinetics parameters was different depending on the frequencies of the VSS. Conclusions This pilot study has revealed evident biomechanical differences between elderly people and young adults during the transition from level walking to stair ascent. Additionally, it has shown that the VSS may accentuate the features of the transition movement of the elderly and regulate joint kinetics. The results of the present pilot study can provide a base for further research and understanding of movement, which can be utilized in designing assistance aids for the elderly. Trial registration CRIS, KCT0005434, Registered 25 September 2020, Retrospectively registered.

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Vibration stimulation effect on biomechanical variation of lower-limb joint according to vibration perception threshold

Cited by 2 publications

References 22 publications

Vibratory Somatosensory Stimulus Improves Neuromechanical Task of Stair Climbing by the Elderly

Vibratory Somatosensory Stimulus Improves Neuromechanical Task of Stair Climbing by the Elderly

Vibrotactile somatosensory stimulus to assist the transition from level walking to stair ascent in the elderly: a pilot study

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