S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Acute Effect of Somatosensory Stimulation on Gastrocnemius Behavior when Elderly People Climb Stairs

Mattatika Pomrop, Kiyoung Kwak, Seughun Ko, and Dongwook Kim

(Received April 17, 2020; Accepted May 13, 2021)

Keywords: local muscle vibration, muscle fascicle length, ultrasound, stair climbing, elderly

Climbing stairs is the one of the activities of daily living (ADL) and is more biomechanically demanding than level walking. Recently, local muscle vibration (LMV) has been applied to movement and rehabilitation, and it was revealed that LMV significantly affects muscle activation. However, there have been no investigations of mechanical muscle behavior in real-time during the application of LMV. The purpose of the present study was to investigate the effects of LMV on muscle behavior and postural stability during stair ascent by the elderly using ultrasound. Fifteen young adults and ten elderly participants were asked to walk and climb stairs. LMV was applied during stair climbing. Center of pressure (COP), electromyography (EMG), and ultrasound data were recorded for each condition. When LMV was applied, a greater RMS-EMG was observed during forward continuance along with a shorter fascicle length and larger pennation angle. The COP of elderly participants was greater than that of young adults. When LMV was applied, the COP decreased. These results suggest that LMV affects muscle behavior, leading to more activation during locomotion. In particular, in elderly people with reduced ADL due to aging, LMV may contribute to muscle activation and increase muscle efficiency, improving ADL ability.

Corresponding author: Dongwook Kim

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