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Yamaguchi-Ishizako Lab
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A lab that studies friction underfoot to support a life free from falls and to understand movement in sports.
AboutAbout the lab
Understanding slips and trips through friction
The Yamaguchi-Ishizako Lab studies friction in soft materials such as rubber and biological tissue, as well as human motion analysis.
It has been reported that deaths from falls, indoors and outdoors, exceed deaths from traffic accidents.
Focusing on the friction between the sole of the foot and the floor, the lab investigates, through both experiments and theory, the conditions needed for stable walking.
The lab also covers situations such as baseball pitching, where fingertip friction influences movement and performance.
Key terms
- Tribology
- The study of friction, wear, and lubrication between objects that are in contact and moving relative to each other.
- Human dynamics
- A field that studies the movement of the human body through the relationship between the forces acting on it and the resulting motion.
- Motion analysis
- Measuring body movement with cameras or sensors to examine joint motion and forces.
ResearchResearch themes
The lab's foundation is friction control of soft materials such as rubber and biological tissue, and human motion analysis. Aiming to improve the integrity and function of mechanical systems and to enhance human motor function, the lab also emphasizes cross-disciplinary research with research institutions in Japan and abroad, and industry-academia co-creation to put its results to use in society.
*Illustrative imagePreventing falls from slips and trips
Falls are also a leading cause of occupational accidents, and most of them result from slips and trips. Focusing on the friction between the sole of the foot and the floor, the lab clarifies, through both experiments and theory, the frictional conditions needed for stable walking, and develops technologies to prevent falls.
*Illustrative imageHuman dynamics and friction
In baseball pitching, the ball's spin rate, speed, and arrival position are controlled through the friction between the fingertips and the ball. Focusing on the relationship between human movement (human dynamics) and friction (tribology), the lab investigates how the magnitude of friction and its perception affect movement, performance, and injury.
MembersFaculty
The Yamaguchi-Ishizako Lab consists of faculty members, doctoral, master's, and undergraduate students, researchers, visiting researchers, administrative assistants, and international students.As of 2026
- ProfessorTakeshi Yamaguchi
- Assistant ProfessorArata Ishizako
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Gait laboratory” D. Gordon E. Robertson / CC BY-SA 3.0 (cropped)
- Preventing falls from slips and trips: “FtPikeWetFloorBricks” Infrogmation of New Orleans / CC BY 3.0 (cropped)
- Human dynamics and friction: “A baseball and glove” John / CC BY 2.0 (cropped)
- Related lab (Nishi Lab): “Non-wetting behavior of a surface of pelletized highly hydrophobic sand. Contact angle between water droplet and the surface is 145.22 degrees” Murat Baisariyev and Aidar Seralin / CC BY-SA 4.0 (cropped)
- Related lab (Murata-Abe Lab): “Molecular Machines of Life” 作者不詳 / Public domain (cropped)
- Related lab (Nomura (S.)-Matsubayashi Lab): “Sarfus.LipidVesicles” Nanolane / Public domain (cropped)
- Related lab (Hayashibe-Zhu Lab): “Cronos humanoid robot” Science Swiss @ Singapore / CC BY-SA 3.0 (cropped)
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