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Your search keyword '"Keiko Nagashima"' showing total 6 results
Start Over Author "Keiko Nagashima" Journal journal of advanced science
6 results on '"Keiko Nagashima"'

1. An assessment of the randomness of body sway variation in neurological patients

Author

Kaori Yamazaki, Takashi Itoh, Kiyoyuki Yamazaki, Katsuro Okamoto, Masaya Sugimoto, Masami Suganuma, and Keiko Nagashima

Subjects
medicine.medical_specialty, Center of gravity, Physical medicine and rehabilitation, Oscillation, medicine, In patient, Variation (astronomy), Randomness, Balance (ability), Body sway, Mathematics
Abstract

Variation of the center of gravity were recorded in 11 patients and normal controls. Involuntary fluctuation segments were extracted and analysed. In patients with posture disorder, randomness were lower than that in the other patients. Results suggested that the random oscillation of the sway plays important role in posture control.

Published
1996
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2. A Comparative study of body sway variation and microvibration using a spectral analysis

Author

Masami Suganuma, Masaya Sugimoto, Takashi Itoh, Kaori Yamazaki, Keiko Nagashima, Kiyoyuki Yamazaki, and Katsuro Okamoto

Subjects
Physics, Center of gravity, Oscillation, Feature (computer vision), Acoustics, Fast Fourier transform, Spectral analysis, Mechanics, Variation (astronomy), Body sway
Abstract

The variation of the center of gravity and microvibration were measured. The data analysed by FFT showed that the spectra of both body sway and microvibration had a 1/fα feature. But theirserious differences suggested that the origin of the microvibration is not related to the body sway oscillation.

Published
1996
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3. A study on body sway variation in gazing rotating figure

Author

Kaori Yamazaki, Toshiya Shimizu, Katsuro Okamoto, Takashi Itoh, Keiko Nagashima, Kiyoyuki Yamazaki, and Masaya Sugimoto

Subjects
Visual sensory, genetic structures, Quantitative Biology::Neurons and Cognition, business.industry, education, Computer Science::Human-Computer Interaction, behavioral disciplines and activities, Signal, eye diseases, Body sway, Computer Science::Robotics, Center of gravity, Computer Science::Graphics, Variation (linguistics), Visual distraction, Computer vision, Artificial intelligence, business, Psychology, psychological phenomena and processes
Abstract

Time series of the center of gravity were analysed to investigate the effect of visual distraction on posture control function. Visual distraction was created by rotating disk filled with geographical patterns. Specific fluctuation related to visual signal was observed. The role of visual sensory processing in posture control was discussed.

Published
1996
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4. A mathematical analysis of randomness in body sway variation

Author

Kiyoyuki Yamazaki, Masami Suganuma, Kaori Yamazaki, Katsuro Okamoto, Masaya Sugimoto, Takashi Itoh, and Keiko Nagashima

Subjects
Langevin equation, Classical mechanics, Variation (linguistics), Statistical physics, Random walk, Randomness, Brownian motion, Body sway, Mathematics
Published
1996
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5. Study of local blood flow of human body sitting on a Sitzball

Author

Keiko Nagashima, Yoshiaki Hayasaka, Katsuro Okamoto, Masaya Sugimoto, and Kiyoyuki Yamazaki

Subjects
Near infrared light, business.industry, Medicine, Oxygenation, Blood flow, Sitting, Balloon, business, Biomedical engineering
Abstract

In this study, local blood flow (LBF) was measured by using a near infrared light oxygenation (NIRO) monitor. Subjects were sitting on office chairs and a Sitzball (balloon shaped chair). LBF in Sitzball sitting condition was significantly greater than that in control condition. Physiological effects of Sitzball were discussed.

Published
1998
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6. Change of alertness in the sitzball sitting condition

Author

Keiko Nagashima, Takashi Itoh, Tatsuya Aiba, Shigeyuki Wakatsuki, Takashi Ohtsuka, Kiyoyuki Yamazaki, and Katsuro Okamoto

Subjects
Alertness, medicine.medical_specialty, medicine.diagnostic_test, medicine, Electroencephalography, Audiology, Psychology, Sitting
Published
1997
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