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University Project Bureau of Global Initiatives Academic Networks Tsukuba Global Science Week（TGSW） Driving Sustainable Development (SDGs) Gender Support Accessibility Support Career Support Harassment Prevention The University of Tsukuba Charter of Support for Students with Disabilities Social Contribution Approach to the Environment Buds of Science Prize Risk Management Risk Management Overseas Safety & Risk Management (for Students) Campus & Facilities Access Map University Hall & 30th Anniversary Hall University of Tsukuba Gallery University of Tsukuba Art Space Campus Tour View Our Video Information Disclosure Mid-term Goals and Plans Integrated Report Information on Credit Rating Japanese College and University Portraits (External link managed by NIAD-QE) Policies and Procedures for Protection of Personal Information Public Relations Outline of the University of Tsukuba At a Glance Maps and Data University of Tsukuba Making a Tsukuba Brand Job Opportunities Job Opportunities Issue of Certificate Schools / Colleges/ Tokyo University of Education / etc Graduate Schools Retirement/Resignation Certificate ADMISSIONS ADMISSIONS TOP Undergraduate Admissions Applying to Tsukuba Degree Programs Taught in English Degree Programs Taught in Japanese Bachelor's Program in Interdisciplinary Engineering Graduate Admissions Applying to Tsukuba Graduate Admissions Graduate Entrance Examination Schedule Search Programs by Discipline Information and Instructions for Examinees Why Tsukuba? Why Tsukuba? Fees & Expenses Admission & Tuition Fees Living Expenses Financial Aid & Scholarships Entrance Fee Exemption and Tuition Waiver Scholarships University of Tsukuba Study Abroad Support Programs Emergency Support Financial Support for Students in the Doctoral Program Guidebooks for International Students Enrollment Guidebook for International Students International Students' Guidebook University of Tsukuba Students' Guide SAFE LIVING - How to Live a Pleasant Student Life ACADEMICS ACADEMICS TOP Education Philosophy Tsukuba STANDARDs Code of Ethics on Education Academic Calendar Academic Calendar Undergraduate Studies Course Registration Procedures Course Catalogue Entrepreneurship Education Grade Evaluation Appeals Distribution Materials for New Undergraduates Students (Spring Semester) Distribution Materials for New Undergraduates Students (Fall Semester) Schools & Colleges（Bachelor) List of Schools and Colleges School of Humanities and Culture School of Social and International Studies School of Human Sciences School of Life and Environmental Sciences School of Science and Engineering School of Informatics School of Medicine and Health Sciences School of Health and Physical Education School of Art and Design School of Integrative and Global Majors (SIGMA) Graduate Studies Graduate School Handbook Graduate General Education Entrepreneurship Education Graduate Education Reform University of Tsukuba, Tokyo Campus　(For Working Individuals) Early Completion Program for Working People Cooperative Graduate School System Grade Evaluation Appeals Distribution Materials for New Graduates Students (Spring Semester) Distribution Materials for New Graduates Students (Fall Semester) Graduate Schools & Programs (Master, Doctor) Search Programs by Discipline Program Listing Graduate School of Business Sciences, Humanities and Social Sciences Graduate School of Science and Technology Graduate School of Comprehensive Human Sciences School of Integrative and Global Majors (SIGMA) Graduate Schools & Programs (for students who entered the university in AY 2019 or before) Program Listing Master's Program in Education Graduate School of Humanities and Social Sciences Graduate School of Business Sciences Graduate School of Pure and Applied Sciences Graduate School of Systems and Information Engineering Graduate School of Life and Environmental Sciences Graduate School of Comprehensive Human Sciences Graduate School of Library, Information and Media Studies International Students Enrollment Guide for International Students International Student Classification--> Degree Programs Taught in Japanese Degree Programs Taught in English Credited Auditors Non-degree Research Students Exchange Students Short Programs Intensive Japanese Training Collaboration with Overseas Partner Universities Overseas Partner Universities Campus-in-Campus (CiC) Initiative Course Jukebox System Double/Joint Degree Program (DDP/JDP) Featured Educational Programs JST SPRING Program Academic Support Centers Center for Education of Global Communication (CEGLOC) Sports and Physical Education Center Admission Center (Japanese only） RESEARCH RESEARCH TOP Research News Research News Researchers TSUKUBA FUTURE TSUKUBA FRONTIER Advanced Research Centers International Institute for Integrative Sleep Medicine (IIIS) Center for Computational Sciences Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance Tsukuba-Plant Innovation Research Center Shimoda Marine Research Center Plasma Research Center Alliance for Research on the Mediterranean and North Africa Center for Cybernics Research Center for Research in Radiation, Isotopes, and Earth System Sciences Center for Artificial Intelligence Research Microbiology Research Center for Sustainability Advanced Research Initiative for Human High Performance Proton Medical Research Center Research Center for West Asian Civilization Tomonaga Center for the History of the Universe Tsukuba Research Center for Energy Materials Science Mountain Science Center Transborder Medical Research Center Leading Projects JST-ERATO NOMURA Microbial Community Control Project Research Support Research Facility Center for Science and Technology Academic Computing & Communications Center Tsukuba Clinical Research & Development Organization(T-CReDO) Organization for the Support and Development of Strategic Initiatives Research Unit / Research Group System University ‘Knowledge’-Based Program Research Administration/Management Office Research Information Portal (COTRE) Research Information System（RISS) Office of Occupational Health and Safety Management Research Compliance Fair Promotion of Research Activities Office of Conflict of Interest and Security Export Control Industry-University Collaboration Industry-University Collaboration Research & Development Centers Open Innovation Strategy Organization （OISO） Entrepreneurship Education University Spin-offs Research Collaboration with Tsukuba City Tsukuba Innovation Arena (TIA) Tsukuba International Strategic Zone Partnerships Overseas Partner Universities Campus-in-Campus Partner Universities CAMPUS LIFE CAMPUS LIFE TOP Voices of International Students Voices of International Students View Our Video Housing & Dining Housing Dining & Shops Guest Houses Extracurricular Activities Clubs and Circles Class & Support System Part-time Job Information for Students Student Support Support for International Students Student Support Center News on Scholarship and Tuition Fees University of Tsukuba Study Abroad Support Programs Mental and Physical Health Support SAFE LIVING - How to Live a Pleasant Student Life Support for Students with Disabilities LGBTQ+ Teaching Assistant (TA) Campus & Facilities On-Campus Transportation System (Bus Pass) Writing Support Harassment Prevention Academic Calendar & University Events Academic Calendar University Events Entrance Ceremony & Commencement Ceremony Student's Guide Student's Guide Campus Web Tools TWINS / Web Bulletin Board TWINS Users’ Guide for Students Web Bulletin Board for Students (Users’ Guide) Web Bulletin Board Categorized Items List［For Students］ Curriculum Scheduling Support System (KdB: List of courses) Curriculum Scheduling Support System (KdB: List of courses) Manual (For Students) Learning Management System (manaba) Overseas Travel System (TRIP) Zengaku Computer System Students' E-mails Remote Access On-Campus Wi-Fi System Search World's Library Collections (Tulips) Open Facility Network Office, Research Facility Career in Japan Graduates Working in Japan Overseas Safety & Risk Management Overseas Safety & Risk Management Overseas Travel System (TRIP) Welfare Facilities Welfare Facilities CAREER & ALUMNI CAREER & ALUMNI TOP Exchange after Graduation Tsukuba Alumni Network (T-Net) University of Tsukuba LinkedIn College Page Overseas Offices Overseas Alumni Tsukuba Universal Alumni Network (TUAN) Issue of Certificates Schools, Colleges, Tokyo University of Education Graduate Schools Follow-Up Services JASSO Follow Up Research Fellowship JASSO Follow Up Research Guidance JSPS Ronpaku (Dissertation Ph.D) Program Career in Japan Graduates Working in Japan NEWS EVENTS Risk Management Giving to Tsukuba Research News Home Research News Dolphin-Kick Swimming Maximizes Water-Flow Utilization with Increasing Speed Medicine/Health Dolphin-Kick Swimming Maximizes Water-Flow Utilization with Increasing Speed Mar 08, 2024 --> Image by S.Pytel/Shutterstock Researchers from University of Tsukuba investigated the propulsion mechanism by visualizing water flow around a swimmer during underwater dolphin-kick swimming in a water channel via particle image velocimetry. Their findings revealed that swimmers can utilize water flow and vortexes more effectively as their speed increases. Tsukuba, Japan—The swimming motion imparts momentum to water, a fluid, thereby generating a propulsive force. Thus, we can understand the propulsion mechanism by examining the water flow generated by a swimmer's motion. However, observing colorless, transparent water with the naked eye or a camera is challenging. To address this issue, researchers employed particle image velocimetry, a technique utilized in fluid dynamics, to visualize water-flow patterns. They investigated how water flow changes as swimmers change their speed while executing the dolphin-kick swimming technique. This investigation was conducted in an experimental circulating-water channel (a pool with flowing water). The results revealed that the water-flow velocity increased with increasing swimming speed during the underwater dolphin-kick lower-limb action, generating a strong vortex during the kicking action. This phenomenon possibly contributes to the increased propulsive force. Additionally, recycling of the flow generated during the downward-kick phase was observed during the transition to the upward-kick phase, with the effect becoming more pronounced as the swimming speed increased. This study marks the first observation of water-flow changes during dolphin-kick swimming at varying speeds. This study is expected to advance research on water flow, a critical topic in swimming research. It offers scientific evidence for instructors to adopt kick-swimming techniques. ### This work was supported by Japan Science and Technology Agency, Grant Number 22 K19725. Original Paper Title of original paper: Impact of variations in swimming velocity on wake flow dynamics in human underwater undulatory swimming Journal: Journal of Biomechanics DOI: 10.1016/j.jbiomech.2024.112020 Correspondence Assistant Professor TSUNOKAWA Takaaki Institute of Health and Sport Sciences, University of Tsukuba / Advanced Research Initiative for Human High Performance (ARIHHP) Assistant Professor SHIMOJO Hirofumi Department of Health and Sports, Niigata University of Health and Welfare Related Link Institute of Health and Sport Sciences Advanced Research Initiative for Human High Performance (ARIHHP) PREVIOUS Research News Convergent Evolution of Algal CO2-Fixing Organelles Feb 29, 2024 Tweet University Library University Hospital Laboratory Schools Job Opportunities Information Disclosure Access Contact Site Map Site Policy Staff Page Bulletin Board (for students) Electricity Monitoring JANU Japanese English--> 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan © University of Tsukuba Japanese English--> © University of Tsukuba 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan University Library University Hospital Laboratory Schools Job Opportunities Information Disclosure Access Contact Site Map Site Policy Staff Page Bulletin Board (for students) Electricity Monitoring JANU