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Early Years Accelerometry

The SADEY (Sleep and Activity Database for the Early Years) project will contribute to transforming the lives' of children and populations internationally by creating the first harmonised database of young children's physical activity, sedentary behaviour and sleep.

This project plans to utilise this database to address several questions of global importance to public health policy and practice, including:

  • How much do young children move, sit and sleep across the globe and does this differ across countries?
  • How much do these individual behaviours or their mix across the 24-hour day impact healthy growth and development?


The team


  • Dr Dylan Cliff, Post-Doctoral Fellow, School of Education, Faculty of the Arts, Social Sciences and Humanities (Australasia, early childhood accelerometry)
  • Janette Green, Principal Research Fellow, Centre for Applied Statistics in Health, Australian Health Services Research Institute (AHSRI) (Database management)
  • Dr Rute Santos, Research Fellow, School of Education. Faculty of the Arts, Social Sciences and Humanities (Europe/UK, physical activity and sedentary behaviour)

External partners:

  • Prof Ian Janssen, Professor and Canada Research Chair in Physical Activity and Obesity, School of Kinesiology and Health Studies, Queen's University, Canada (North America, physical activity and sedentary behaviour)
  • ​Dr Catherine Draper, Senior Research Officer, Division of Exercise Science and Sports Medicine, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, South Africa (Africa, physical activity and sedentary behaviour)
  • Prof Fan Jiang, Shanghai Jiao Tong University, China (Asia, sleep)
  • Prof Tim Olds, Professor, School of Health Sciences, University of South Australia, Australia (Australasia, sleep)
  • Prof Mark Tremblay, Professor of Pediatrics in the Faculty of Medicine, University of Ottawa, Canada (senior advisor, international collaboration)
  • Dr Esther van Sluijs, Programme Leader - Behavioural Epidemiology, MRC Epidemiology Unit, University of Cambridge, UK (UK, Accelerometer database expertise, physical activity and sedentary behaviour)


This project is working towards the UN Sustainable Development Goals:

Goal 4, Quality Education .  Goal 17, Partnerships for the Goals.