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157 results on '"Kobara, Kenichi"'

1. Effect of shape of back support adjustment on shear force applied to buttocks when tilt-in-space and reclining functions are combined in wheelchairs.

Author

Kobara, Kenichi, Nagata, Yasuyuki, Takahashi, Hisashi, Osaka, Hiroshi, Suehiro, Tadanobu, and Fujita, Daisuke

Subjects
*SHEAR (Mechanics), *BIOMECHANICS, *WHEELCHAIRS, *T-test (Statistics), *RESEARCH funding, *DESCRIPTIVE statistics, *BUTTOCKS, *SITTING position, *POSTURE, *DATA analysis software
Abstract

This study aimed to investigate the effect of the shape of the back support adjustment on the shear force applied to the buttocks when tilt-in-space and reclining functions are combined in wheelchairs. Fourteen healthy adult men were included in the study. The force plate was used to measure the parallel force as shear force. The measurement posture, leaning against the back support of an experimental chair, was a comfortable sitting posture. The tilt-in-space angle was set to 15°. The back support was inclined at increasing angles, starting from the upright position (IUP), proceeding to a fully reclined position (FRP), and returning to the upright position (RUP). The experimental conditions were as follows: adjusting the back-support shape (aBS) and non-adjusting the back support shape (non-aBS). Positive values indicate a parallel force applied to the buttocks posteriorly. The average values in the aBS condition were 3.4 ± 2.3, 13.6 ± 2.2, and −7.1 ± 2.4% body weight in the IUP, FRP, and RUP, respectively. The average values in the non-aBS condition were 3.8 ± 2.5, 11.4 ± 2.1, and −6.2 ± 3.1% body weight in the IUP, FRP, and RUP, respectively. There were significant differences between the two conditions in FRP (p < 0.01). These findings suggest that the shape of the back support adjustment function increased the shear force applied to the buttocks posteriorly when the back support was inclined backwards using both the tilt-in-space and reclining functions. When utilizing both the tilt-in-space and reclining functions to incline the back support, the shear force applied to the buttocks is greatly affected by the shape of the back support. The shape of back support adjustment is a function that can stabilize elderly persons' sitting posture, but it may increase the external force applied to the buttocks and back. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Effectiveness of impedance parameters for muscle quality evaluation in healthy men

Author

Kobara Kenichi, Hiroki Sato, T. Kusuhara, Takao Nakamura, Kozo Hanayama, Takaki Kawashima, and Katsushi Kuniyasu

Subjects
Bioelectrical impedance analysis, Adult, Male, Materials science, Physiology, Isometric exercise, 030204 cardiovascular system & hematology, Knee extension, Impedance parameters, 03 medical and health sciences, Young Adult, 0302 clinical medicine, Nuclear magnetic resonance, medicine, Electric Impedance, Humans, Muscle Strength, Muscle, Skeletal, Muscle quality, Phase angle, Skeletal muscle, Cole–Cole model, medicine.anatomical_structure, Lower Extremity, Stepwise multiple regression analysis, 030217 neurology & neurosurgery, Intensity (heat transfer)
Abstract

We investigated the relationship between impedance parameters and skeletal muscle function in the lower extremities, as well as the effectiveness of impedance parameters in evaluating muscle quality. Lower extremity impedance of 19 healthy men (aged 23–31 years) measured using the direct segmental multi-frequency bioelectrical impedance analysis were arc-optimized using the Cole–Cole model, following which phase angle (PA), $${R}_{i}/{R}_{e}$$ R i / R e , and β were estimated. Skeletal muscle function was assessed by muscle thickness, muscle intensity, and isometric knee extension force (IKEF). IKEF was positively correlated with PA (r = 0.58, p β (r = 0.34, p $${R}_{i}/{R}_{e}$$ R i / R e (r = − 0.43, p $${R}_{i}/{R}_{e}$$ R i / R e were correlated with IKEF independently of muscle thickness. This study suggests that arc-optimized impedance parameters are effective for evaluating muscle quality and prediction of muscle strength.

Published
2020

22. An investigation into the effectiveness of a novel wheelchair seat-cover assembly for the reduction of forces exerted onto the buttocks.

Author

Kobara, Kenichi, Takahashi, Hisashi, Nagata, Yasuyuki, Osaka, Hiroshi, Suehiro, Tadanobu, and Fujita, Daisuke

Subjects
*WHEELCHAIRS, *EVALUATION of medical care, *BUTTOCKS, *BODY weight, *PRESSURE ulcers, *PRODUCT design, *CLINICAL medicine, *POSTURE, *HOSPITAL care of older people, *RESEARCH funding, *BIOMECHANICS, *OLDER people with disabilities, *DISABILITY chairs, *EQUIPMENT & supplies
Abstract

This purpose was to investigate developed seat-cover assemblies' effect on decreasing the fluctuation of the shear force exerted onto the buttocks as the factors causing decubitus ulcers when the back-support was inclined. The participants were 10 wheelchair users. The force plate was used to measure the horizontal force as the shear force. The back-support was inclined at increasing angles, starting from the upright position (IUP), then proceeding to a fully reclined position (FRP), and returning to the upright position (RUP). The experimental conditions were two conditions; the seat-cover assembly conditions and without the seat-cover assembly as the control conditions. The average values in the seat-cover assembly condition were 14.4 ± 3.3, 13.9 ± 2.3, and 17.3 ± 3.3% body weight in the IUP, FRP, and RUP, respectively. The average values in the control condition were 14.8 ± 2.6, 11.4 ± 1.7, and 24.0 ± 6.7% body weight in the IUP, FRP, and RUP, respectively. In the FUP and the RUP, there were significant differences between two conditions (p <.01). These results suggested that the shear force exerted onto the buttocks may to be decreased by using novel seat-cover assembly. It is possible to decrease the fluctuations in the shear force by moving the body up and down according the novel seat-cover assembly attached the back-support incline. Disabled, older individuals can be provided with a comfortable life on a reclining wheelchair while preventing decubitus ulcers. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Influence of deflection of wheelchair seat on estimated shear force on the buttocks

Author

Kobara, Kenichi, Eguchi, Atsuko, Watanabe, Susumu, Fujita, Daisuke, Nishimoto, Tetsuya, and Shinkoda, Koichi

Subjects
wheelchair, 車いす, seat, シート, shear force, ずれ力
Abstract

本研究は, 普通型車いすシートのたわみが安楽座位時の臀部ずれ力推定値に与える影響を検討する目的で行った. 対象は健常成人男性14名(20.6±0.6歳)であった. 実験は, シートのたわみを調節することによって3条件(たわみ小, 中, 大)で行った. ずれ力の推定には筆者らの実験モデルを用いた. 統計学的解析は一元配置分散分析を用い, 3条件間で比較した. その結果, 臀部ずれ力推定値は「たわみ小」では47.9±7.0N, 「たわみ中」は42.8±4.7N, 「たわみ大」は39.8±6.6Nであり, 「たわみ小」と「中」の間(p, The purpose of this study was to investigate how deflection of a standard-type wheelchair seat would influence the estimated shear force on the buttocks in comfortable wheelchair sitting. Fourteen healthy males aged 20.6±0.6 years without pathologies in the leg and/or trunk participated in this study. The study was conducted under three conditions, i.e. small, medium, and big deflection, by controlling the deflection of the seat. The shear force on the buttocks was estimated using an experimental model proposed by us. For statistical analysis, a ONEWAY ANOVA was used with the level of significance at p value below .05 level. The results showed that the estimated shear force on the buttocks was 47.9 ± 7.0 N with the small deflection, 42.8±4.7 N with the medium deflection, and 39.8 ± 6.6 N with the big deflection. There was a significant difference in the estimated shear force between the small and medium (p

Published
2008

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