Effects of shelf bar assistance on kinetic control during sit-to-stand in healthy young and elderly subjects

Yusuke Sekiguchi; Keita Honda; Thitiporn Phakdepiboon; Mao Jinde; Tomohisa Kato; Hiroyasu Kanetaka; Shin-Ichi Izumi

doi:10.1016/j.jbiomech.2020.109822

Effects of shelf bar assistance on kinetic control during sit-to-stand in healthy young and elderly subjects

J Biomech. 2020 Jun 9:106:109822. doi: 10.1016/j.jbiomech.2020.109822. Epub 2020 May 11.

Authors

Yusuke Sekiguchi¹, Keita Honda², Thitiporn Phakdepiboon³, Mao Jinde⁴, Tomohisa Kato⁵, Hiroyasu Kanetaka⁶, Shin-Ichi Izumi⁷

Affiliations

¹ Dept of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, 2-1, Seiryo-machi, Sendai, Japan. Electronic address: yusuke.sekiguchi.b2@tohoku.ac.jp.
² Dept of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, 2-1, Seiryo-machi, Sendai, Japan. Electronic address: keita.honda.d2@tohoku.ac.jp.
³ Dept of Rehabilitation Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand. Electronic address: Aimthiti@gmail.com.
⁴ Dept of Research and Development, Toto Ltd, 2-8-1 Motomura, Chigasaki, Japan. Electronic address: mao.jinde@jp.toto.com.
⁵ Dept of Research and Development, Toto Ltd, 2-8-1 Motomura, Chigasaki, Japan. Electronic address: tomohisa.kato@jp.toto.com.
⁶ Laison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-cho, Aoba-ku, Sendai, Japan; Graduate School of Biomedical Engineering, Tohoku University, 2-1, Seiryo-machi, Sendai, Japan. Electronic address: kanetaka@m.tohoku.ac.jp.
⁷ Dept of Physical Medicine and Rehabilitation, Tohoku University Graduate School of Medicine, 2-1, Seiryo-machi, Sendai, Japan; Graduate School of Biomedical Engineering, Tohoku University, 2-1, Seiryo-machi, Sendai, Japan. Electronic address: izumis@bme.tohoku.ac.jp.

PMID: 32517993
DOI: 10.1016/j.jbiomech.2020.109822

Abstract

This study aimed to determine the kinetic effects of using unilateral shelf bar, vertical grab bar (GB), and horizontal GB during sit-to-stand (STS) in young and elderly subjects. Twenty young adults aged 20-40 years and eighteen healthy elderly people aged ≥ 65 years old were recruited. The subjects performed STS with and without using the three types of bars. Bar reaction force (BRF) and maximum power (MP) defined as the maximal product calculated by multiplying the GRF and the velocity of the center of mass in each direction were measured using three-dimensional motion analysis, two load sensors of GB, and four force plates. The use of the shelf bar generated a significantly larger BRF in the vertical direction than the other bars (p < 0.05) and lower MP in the vertical direction than the horizontal bar (p < 0.05) and no bar (p < 0.05). In the younger subjects, only the use of the vertical bar generated a significantly larger BRF (p < 0.05) and negative MP (p < 0.05) in the forward direction than those in elderly subjects. The use of the shelf bar may assist the decreased MP in the vertical direction during STS in elderly people, resulting in decrease of failed STS in daily living. In contrast, the use of the vertical bar in the elderly may not generate sufficient BRF in the forward direction because of lack of eccentric control in the whole body in the forward direction during STS.

Keywords: Elderly people; Grab bar; Power; Shelf bar; Sit to stand.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adult
Aged
Biomechanical Phenomena
Humans
Kinetics
Mechanical Phenomena*
Movement*
Young Adult