論文 - 仰木　裕嗣

The development of an estimation model for energy expenditure during water walking by acceleration and walking speed.

Koichi Kaneda, Yuji Ohgi, Chiaki Tanaka, Brendan Burkett.

Journal of Science and Medicine in Sport （ISEA）  17 （ 1 ） 96 - 101 2014年01月

研究論文（学術雑誌）, 共著,  ISSN  1440-2440

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Objectives: The aim of this study was to develop an estimation equation for energy expenditure during water walking based on the acceleration and walking speed.
Design: Cross-validation study.
Methods: Fifty participants, males (n = 29, age: 27-73) and females (n = 21, age: 33-70) volunteered for this study. Based on their physical condition water walking was conducted at three self-selected walking speeds from a range of: 20, 25, 30, 35 and 40 m/min. Energy expenditure during each trial was calculated. During water walking, an accelerometer was attached to the occipital region and recorded three-dimensional accelerations at 100 Hz. A stopwatch was used for timing the participant's walking speed. The estimation model for energy expenditure included three components; (i) resting metabolic rate, (ii) internal energy expenditure for moving participants' body, and (iii) external energy expenditure due to water drag force.
Results: When comparing the measured and estimated energy expenditure with the acceleration data being the third component of the estimation model, high correlation coefficients were found in both male (r = 0.73) and female (r = 0.77) groups. When walking speeds were applied to the third component of the model, higher correlation coefficients were found (r = 0.82 in male and r = 0.88 in female). Good agreements of the developed estimation model were found in both methods, regardless of gender.
Conclusions: This study developed a valid estimation model for energy expenditure during water walking by using head acceleration and walking speed. (C) 2013 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.

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A Community-Based Health Promotion Program Utilizing Web2.0

Shoko Miyagawa, Yuko Oguma, Yuji Ohgi, Akiko Sato, Shigeo Ohsawa

Studies in Health Technology and Informatics （IOS Press）  205   1201 2014年

査読有り,  ISSN  1879-8365

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エビデンス・ベースド・スポーツの時代

仰木　裕嗣

KEIO SFC JOURNAL 14 （ 2 ） 24 - 41 2014年

Aerodynamic Hysteresis of a Discus

Kazuya Seo, Ken Ohta, Yuji Ohgi, Yuji Kimura

Procedia Engineering （6th Asia-Pacific Congress on Sports Technology (APCST)）  60   294 - 299 2013年07月

研究論文（学術雑誌）, 共著,  ISSN  1877-7058

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This paper describes the hysteresis in the aerodynamic properties of a discus near to its stalling angle. Wind tunnel tests were carried out with a full-size woman's discus. The experimental aerodynamic data D, L and M were obtained from wind tunnel tests as functions of the angle of attack and the spin rate. It was found that the drag, lift and pitching moment coefficients, C-D C-L and C-M, increase with increasing the angle of attack up to a stalling angle of 28-30 degrees. Beyond the stalling angle, C-L and C-M decrease suddenly and abruptly with increasing angle of attack. On the other hand, recovery from the stall does not occur at the same stalling angle of 28-30 degrees when the angle of attack decreases from the stall state; recovery actually occurs at 25 degrees. The C-L-alpha (angle of attack) curve is almost the same when the angle of attack is less than 24 degrees. Therefore, hysteresis occurs near the stalling angle. (C) 2013 The Authors. Published by Elsevier Ltd. Selection and peer-review under responsibility of the School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University

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バスケットボール戦術下でのリバウンド行為中における熟練者の視覚探索活動

石橋千征，加藤貴昭，永野智久，仰木裕嗣，佐々木三男

スポーツ産業学研究 23 （ 1 ） 45 - 53 2013年05月

研究論文（学術雑誌）, 共著, 査読有り

A KINEMATICAL AND KINETICAL ANALYSIS ON THE SWING PHASE OF AMPUTEE GAIT.

Yuji OHGI, James Bruce LEE, Koichi KANEDA

Scientific Proceedings of the 31th International Conference on Biomechanics in Sports    B1-1 ID87 2013年

査読有り

Lower limb and trunk muscles activity when exercising in water

仰木 裕嗣

Journal of Science and Medicine in Sport Be Active 2012 15   S62 2012年12月

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WALKING AND RUNNING KINESIOLOGY IN WATER: A REVIEW OF THE LITERATURE

KOICHI KANEDA, MARK R MCKEAN, YUJI OHGI, BRENDAN BURKETT

Journal of Fitness Research （Fitness Research）  1 （ 1 ） 1-11 2012年12月

査読有り

A computer simulation of the flying disc based on the wind tunnel test data

仰木 裕嗣

The Conference Proceedings of The Engineering of Sport 9 （Edited by Patrick Drane and James Sherwood, Procedia Engineering）  34   80 - 85 2012年

共著,  ISSN  1877-7058

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The purpose of this study was validation of a computer simulation on the flight of the flying disc. The flying disc, widely known as the Frisbee (TM), is thrown with rotation for its stable flight. The flight characteristics of the flying disc were identical in comparison with other flying sports materials. The flying disc can keep its lift and glide in the air by the wing effect. However, the traveling direction of the disc was steeply changed in particular conditions. In order to explain this phenomenon, the precise simulation of the disc movement is necessary. In this study, a computer simulation of the flying disc was accomplished. In advance of the simulation, both the three-axial forces and moments acting on the disc were measured in a wind tunnel test for the simulation. For the validation of the simulation results, the authors conducted an experiment using a motion capture system to obtain real flying disc kinematical parameters. (C) 2012 Published by Elsevier Ltd.

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Aerodynamic behavior of a discus,

仰木 裕嗣

The Conference Proceedings of The Engineering of Sport 9 （Edited by Patrick Drane and James Sherwood, Procedia Engineering）  34   92 - 97 2012年

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Optimization of the moment of inertia and the release conditions of a discus,

仰木 裕嗣

The Conference Proceedings of The Engineering of Sport 9 （Edited by Patrick Drane and James Sherwood, Procedia Engineering）  34   170 - 175 2012年

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Mechanical energy transfer by internal forces during the swing phase of running

仰木 裕嗣

The Conference Proceedings of The Engineering of Sport 9 （Edited by Patrick Drane and James Sherwood, Procedia Engineering）  34   772 - 777 2012年

研究論文（学術雑誌）, 共著

Monitoring sprinting gait temporal kinematics of an athlete aiming for the 2012 London Paralympics

仰木 裕嗣

The Conference Proceedings of The Engineering of Sport 9 （Edited by Patrick Drane and James Sherwood, Procedia Engineering）  34   778 - 783 2012年

共著,  ISSN  1877-7058

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Elite running typically requires performance analysis. This equally applies to able-body and amputee athletes who use prosthetic limbs. Amputee runners with artificial limbs deal with unique situations such as balance and control of the prosthetic. A new lower limb has been developed and performance requires ongoing monitoring. Inertial sensor technology, accelerometers and gyroscopes, were used to measure the limb's development, in particular stride, step, and stance duration. While research has been reported on these variables for able-body athletes, no research has investigated these kinematics from Paralympic athletes using inertial technology. The participant's existing and new prosthetic performance were compared. Performance monitoring of the limb during athlete use is required in order objectively assess the new limb's capabilities. (C) 2012 Published by Elsevier Ltd.

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Sensor fucion: Let’s enhance the performance of performance enhancement

仰木 裕嗣

The Conference Proceedings of The Engineering of Sport 9 （Edited by Patrick Drane and James Sherwood, Procedia Engineering）  34   795 - 800 2012年

共著,  ISSN  1877-7058

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Typical in-filed technology used for human movement assessment is a single tool such as a video camera. However, there are drawbacks with this system. Understanding various human actions e. g. swimming kinematics, or the legality of a bowling action in cricket, is important for performance analysis. Inertial sensors can biomechanically capture temporal kinematics. Measuring the kinematics of human movement, allows performance analysers to monitor progression of an athlete's development. Fusing video and inertial sensor technology supplies visual feedback in conjunction with technical information. The video-sensor fusion presented here provides assessment for athletes where gross visual measures combined with fine movement monitoring possible. Therefore, a novel system can be offered which can assist athlete performance development. (C) 2012 Published by Elsevier Ltd.

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A comparison of lower limb joints angular displacement between land and water-walking using dynamic time warping

Kaneda K, Mckean M, Ohgi Y, Burkett B

Scientific Proceedings of the 30th International Conference on Biomechanics in Sports    331 - 334 2012年

査読有り

Optimization of the moment of inertia and the release conditions of a discus

Kazuya Seo, Koji Shimoyama, Ken Ohta, Yuji Ohgi, Yuji Kimura

ENGINEERING OF SPORT CONFERENCE 2012 （ELSEVIER SCIENCE BV）  34   170 - 175 2012年

ISSN  1877-7058

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This paper describes the concurrent optimization of the design of a discus and the skill with which it is thrown. The objective function for optimization is the flight distance, where longer is better. Thirteen control variables are considered, twelve of which are concerned with the skill of the thrower. These determine the launch conditions, which are controlled by the thrower when he or she throws the discus. The final variable is concerned with the discus itself. This is the moment of inertia on its transverse axis. The optimization was carried out with the aid of a genetic algorithm, and the entire trend for each generation between the objective function and the control variables could be visualized with the aid of self organizing maps. It was found that the flight distance achieved with concurrent optimization was longer than that optimized for skill alone. In the case of the optimal flight, the angle of attack should always be less than the stalling angle. (C) 2012 Published by Elsevier Ltd.

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Mechanical energy transfer by internal force during the swing phase of running

Nanako Yamazaki, Ken Ohta, Yuji Ohgi

ENGINEERING OF SPORT CONFERENCE 2012 （ELSEVIER SCIENCE BV）  34   772 - 777 2012年

ISSN  1877-7058

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Running is a cyclic motion in which each leg has two phases, stance and swing. The energy generated by the muscular forces are dominant in the phase between initial contact and mid-stance. However, during the swing phase, other internal forces act to transfer the mechanical energy between segments. In this research, we focused on the energy transfer mechanism during the swing phase and investigated how non-muscular (e. g. centrifugal and gravity) forces of each link generate, absorb, and transfer the mechanical energy. A mathematical analysis of the lower limb's movement in the swing phase of running at different speeds was carried out. A multi-body power analysis was performed using dynamical equations of a three-dimensional double pendulum to find the mechanism to increase the speed of the leg swing efficiently. Results show that the internal force at the knee joint work throughout the swing phase to generate centrifugal force in the shank and that the knee joint moment is very small in comparison to the internal force. Understanding the transfer mechanism using the internal forces could lead to economical running forms that prevent injuries and enhance the performance of the runners. (C) 2012 Published by Elsevier Ltd.

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Aerodynamic behavior of a discus

Kazuya Seo, Koji Shimoyama, Ken Ohta, Yuji Ohgi, Yuji Kimura

ENGINEERING OF SPORT CONFERENCE 2012 （ELSEVIER SCIENCE BV）  34   92 - 97 2012年

ISSN  1877-7058

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To determine the flight path of a discus when it is thrown, it is essential to know what aerodynamic forces are acting on it. However, little data on this is available. Employing a full-size model in a wind tunnel, we have measured the aerodynamic forces acting on a discus spinning on its transverse axis, as well as on a 'non-spinning' discus. The aerodynamic force data (drag, lift and pitching moment) were obtained to create an 'aerodynamic database'. These forces are given as functions over practical ranges of the angle of attack, the spin rate and the wind speed. It was found that the stalling angle was about 30 degrees, and that the lift coefficient increased linearly with increasing angle of attack up to the stalling angle. The estimated lift coefficient obtained by the vortex lattice method agrees with the experimental data within a standard deviation of 0.08. It was observed by oil flow and smoke observation methods that a pair of longitudinal vortexes occur from the 'pressure side' to the 'suction side', similar to wing-tip vortices. These longitudinal vortexes prevent flow-separation up to a high angle of attack, around 30 degrees. The drag coefficient increases with increasing angle of attack up to the stalling angle, and it decreases slightly around the stalling angle, corresponding to a significant and abrupt decrease in lift at the same angle. The coefficient of the pitching moment is almost positive, which is the case with 'nose-up' rotation. There is little difference between the aerodynamic coefficients whether the discus is spinning or not. (C) 2012 Published by Elsevier Ltd.

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Kinematical measurement of the sporting leg prosthesis on the amputee sprinters

仰木 裕嗣

Journal of Science and Medicine in Sport 14   e91 2011年12月

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Which is better to attach accelerometer for classifying water exercise, head or chest?

仰木 裕嗣

Journal of Science and Medicine in Sport 14   e86 2011年12月

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