Motohiko Miyachi is Professor of Sport Sciences at Waseda University, Tokyo, and former Chief of Physical-Activity Research at Japan’s National Institutes of Biomedical Innovation. Holding a Ph.D. in sports science from the University of Tsukuba, he has published >300 peer-reviewed articles (h-index 47) linking habitual physical activity, sedentary behaviour, resistance training and dietary protein to cardiovascular health, sarcopenia, frailty and longevity. Education & Academic Career Ph.D. (Sports Science), University of Tsukuba, 1999 M.P.E., National Institute of Fitness and Sports in Kanoya, 1990 Professor, Faculty of Sport Sciences, Waseda University, 2021-present Chief, Dept. of Physical Activity Research, NIBIOHN, 2017-2022 Associate Professor, Kawasaki University of Medical Welfare, 1999-2003 Visiting Professor, University of Colorado-Boulder, 2001-2002 Research Focus His group uses epidemiological cohorts, accelerometry, doubly-labelled water and randomised trials to quantify how daily step counts, exercise intensity, protein intake and urban-design attributes modulate arterial stiffness, muscle mass, frailty, metabolic syndrome and mortality in children, adults and older populations. Recent work clarifies dose-response thresholds for steps and BMI that differ between frail and non-frail elders, demonstrates that resistance training combined with chicken-meat ingestion mitigates training-induced arterial stiffening, and develops open-source algorithms to standardise consumer-grade tracker data. Scientific Awards & Recognition 2024 Waseda University Research Award (Leading Research) Member, Science Council of Japan (2018-present; liaison 2015-2018) Advisor, MHLW “Health Japan 21” and Tokyo Metropolitan Government cycling & sport promotion councils Professional Memberships American Heart Association American Physiological Society Japanese Society of Public Health Japanese Society of Physical Fitness and Sports Medicine Policy & Societal Contributions He chairs national working groups that revise Japanese physical-activity guidelines for health promotion, designs municipal surveys evaluating cross-sectoral policy implementation, and co-authors Science-Council white papers on building resilient medical and community systems for ageing societies in the post-COVID era.