Kiyotaka Fukumoto

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We have developed a pupil-corneal reflection method-based gaze detection system, which allows large head movements and achieves easy gaze calibration. This system contains two optical systems consisting of components such as a camera and a near-infrared light source attached to the camera. The light source has two concentric LED rings with different(More)
Muscular strength can be estimated by quantification of muscle area. For this purpose, we developed a flexible measuring system for muscle area using ultrasonography. This method is completely safe and is particularly suitable for elderly people because the subjects are not required to perform any muscular contraction during measurement. The ultrasound(More)
PURPOSES The present study investigated whether a combination of the thickness and hardness of muscles without muscle tension can be used to estimate muscle strength during knee extension in adult males and females. METHODS Seventy-two males and thirty-three females, whose ages ranged from 18 to 35 years, participated in this study. We measured muscle(More)
In this new method for determining serum guanase activity by use of the Hitachi 736-40 automated analyzer, serum is incubated with a mixture of xanthine oxidase, superoxide dismutase, and catalase; a reagent containing KCN, guanine, nitrotetrazolium blue, and Triton X-100 is added; and the increase in absorbance at 570 and 660 nm is measured for 2.4 min.(More)
To evaluate capacity of the elderly body and the extremities, we developed a measurement system for thigh cross-sectional image. The cross-sectional images were suitable for observing muscle volume. Some previous studies estimated muscular strength based on muscle volume measured the medical images. However there were no studies that used information(More)