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RISS 인기검색어
- 검색키워드
- 저자 : ( Yoshika Takahashi ) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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The Influence of Laterality during Gait Cycle on Manual Pushing
Kadek Heri Sanjaya,Yoshika Takahashi,Soomin Lee,Yoshihiro Shimomura,Tetsuo Katsuura 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
The objective of this study was to investigate the influence of laterality in various speeds of gait cycle on manual pushing which has been given less attention. The participants of this study were 17 healthy males, 6 of them were left-handers. They performed trials by pushing a wall force plate during walking on a treadmill in three speeds: 1.5, 3, and 4 km/h. The participants were instructed to push at no less than 50% of their maximum static pushing force. Electromyogram (EMG) data was collected bilaterally from tibialis anterior, soleus, lumbar erector spinae and triceps brachii muscles. Time series analysis was normalized into gait cycle which was described as time between heel strike and just before the next heel strike of the same foot and it consisted of 100 data points. To show symmetry, cross-correlation function analysis from the left and right gait cycle variables were compared. Asymmetrical gait cycle period was only observed among right-handers at 3 km/h speed where right gait cycle had longer time than left gait cycle. Pushing force symmetry index was not changed in all of the three speeds in both right-handers and left-handers. Pushing force exertion showed asymmetry in between left and right gait cycle in 4 km/h pushing. The activation pattern of tibialis anterior, soleus and lumbar erector spinae muscles did not show any significant change due to different speeds of manual pushing. However, triceps brachii showed differences due to speeds among left-handers. The better understanding of laterality on manual pushing will help in not only better design of manual pushing tools and tasks but also on its application beyond manual materials handling.
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The Influence of Laterality during Gait Cycle on Manual Pushing
( Kadek Heri Sanjaya ),( Yoshika Takahashi ),( Soomin Lee ),( Yoshihiro Shimomura ),( Tetsuo Katsuura ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
The objective of this study was to investigate the influence of laterality in various speeds of gait cycle on manual pushing which has been given less attention. The participants of this study were 17 healthy males, 6 of them were left-handers. They performed trials by pushing a wall force plate during walking on a treadmill in three speeds: 1.5, 3, and 4 km/h. The participants were instructed to push at no less than 50% of their maximum static pushing force. Electromyogram (EMG) data was collected bilaterally from tibialis anterior, soleus, lumbar erector spinae and triceps brachii muscles. Time series analysis was normalized into gait cycle which was described as time between heel strike and just before the next heel strike of the same foot and it consisted of 100 data points. To show symmetry, cross-correlation function analysis from the left and right gait cycle variables were compared. Asymmetrical gait cycle period was only observed among right-handers at 3 km/h speed where right gait cycle had longer time than left gait cycle. Pushing force symmetry index was not changed in all of the three speeds in both right-handers and left-handers. Pushing force exertion showed asymmetry in between left and right gait cycle in 4 km/h pushing. The activation pattern of tibialis anterior, soleus and lumbar erector spinae muscles did not show any significant change due to different speeds of manual pushing.
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Ergonomic Study of Mattress Firmness by Measuring Spinal Curve and Sleep Quality
( Tetsuo Katsuura ),( Masaki Teshima ),( Yali Xia ),( Soomin Lee ),( Yoshika Takahashi ),( Ikuo Asai ),( Yoshihiro Shimomura ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
We examined the influence of mattress firmness on the spinal curve, sleep quality, and subjective evaluations in healthy subjects. The firmness of the three equal parts of air /mattress was controlled by the air pressure in each part. In Experiment 1, we created nine air mattress conditions by setting the air pressure of each of the upper and middle parts at 4, 6, or 8 kPa, and that of the lower part at 6 kPa. We measured the spinal curves of 10 healthy young male subjects from the coccyx to the 7th cervical vertebra by a fiber optic-based 3D bend and twist sensor, while they laid down on their right side with the angle of the trunk and thigh at 135º (abbreviated as lying135º) and when they laid supine, in each of the nine mattress conditions. We found that the spinal curve during supine position with the conditions of lower part: 6 kPa, middle: 4 kPa, and upper: 6 kPa (6:4:6) was the most similar to that during lying135º, which makes the spinal curve natural. However, the subjective evaluation of comfort of the mattress by a visual analog scale (VAS) scored highest in the 6:4:8 condition.
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Ergonomic Study of Mattress Firmness by Measuring Spinal Curve and Sleep Quality
Tetsuo Katsuura,Masaki Teshima,Yali Xia,Soomin Lee,Yoshika Takahashi,Ikuo Asai,Yoshihiro Shimomura 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
We examined the influence of mattress firmness on the spinal curve, sleep quality, and subjective evaluations in healthy subjects. The firmness of the three equal parts of air /mattress was controlled by the air pressure in each part. In Experiment 1, we created nine air mattress conditions by setting the air pressure of each of the upper and middle parts at 4, 6, or 8 kPa, and that of the lower part at 6 kPa. We measured the spinal curves of 10 healthy young male subjects from the coccyx to the 7th cervical vertebra by a fiber optic-based 3D bend and twist sensor, while they laid down on their right side with the angle of the trunk and thigh at 135° (abbreviated as lying135°) and when they laid supine, in each of the nine mattress conditions. We found that the spinal curve during supine position with the conditions of lower part: 6 kPa, middle: 4 kPa, and upper: 6 kPa (“6:4:6”) was the most similar to that during lying135°, which makes the spinal curve natural. However, the subjective evaluation of "comfort of the mattress" by a visual analog scale (VAS) scored highest in the 6:4:8 condition. As Experiment 2, we compared sleep quality achieved with the 6:4:6 and 6:4:8 conditions over each of seven consecutive nights (three adaptation nights and four for analysis) in subjects’ homes. The sleep quality achieved by 20 healthy adult males and females was assessed by means of actigraphy, the standardized Oguri-Shirakawa-Azumi (OSA) Sleep Inventory (middle-aged version), and VAS subjective evaluations. The estimated sleep quality measured on the 6:4:6 mattresses was significantly higher than that on the 6:4:8 mattress. The VAS evaluations of "comfort of the lower back" and "comfort of the upper back" were also higher for the 6:4:6 mattress. There were no significant differences in the OSA scores between mattress conditions. Our results indicate that the 6:4:6 mattress condition, which appeared to provide a natural spinal curve, provided higher sleep quality and higher subjective evaluations during actual use compared to the 6:4:8 condition.
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