• United Kingdom

Accepting PhD Students

  • 197 Citations
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Personal profile

Personal Statement

I started as a Chancellor's Fellow in the Physical Activity for Health group in the School of Psychological Sciences and Health in August 2015. I graduated with a BSc in Biomedical Engineering in 2008, followed by a MSc in Biology of Human Performance and Health in 2009. I completed my PhD at the University of Wollongong, Australia before joining the University of Strathclyde as a research associate in Jan 2014.

Research Interests

My research interests include exploring patterns of sedentary behaviour and physical activity across childhood and adolescence and their influence on health outcomes (e.g. cardiometabolic health) and measurement of physical activity and sedentary behaviour in children and adolescents. My current fellowship program (Sitting in Teens; SITS) aims to increase the evidence base foundation for interventions aiming to decrease time spent sitting and increase breaks in sitting time in teenagers. 

I am also part of the Gateshead Millennium Study research team. GMS is an important longitudinal study, examining changes in sitting time during childhood and adolescence, detrminants of sitting time and the association between changes in sitting time and adiposity.

Expertise & Capabilities

  • Measurement of physical activity and sedentary behaviour in children and adolescents.
  • Patterns and changes in sedentary behaviour and physical activity across childhood.

Education/Academic qualification

Doctor of Philosophy, University of Wollongong

Master of Science, Maastricht University

Bachelor of Science, Zuyd University

Fingerprint Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

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Projects 2018 2018

Research Output 2013 2018

  • 197 Citations
  • 29 Article
  • 1 Chapter

Bidirectional associations between adiposity, sedentary behavior and physical activity: a longitudinal study in children

Tanaka, C., Janssen, X., Basterfield, L., Parkinson, K., Pearce, M., Reilly, J., Adamson, A. & Reilly, J. 22 Jun 2018 (Accepted/In press) In : Journal of Physical Activity and Health. 19 p.

Research output: Contribution to journalArticle

Open Access
Longitudinal Studies
Body Mass Index

Changes in sitting time and sitting fragmentation after a workplace sedentary behaviour intervention

Hutchinson, J., Headley, S., Matthews, T., Spicer, G., Dempsey, K., Wooley, S. & Janssen, X. 1 Jun 2018 In : International Journal of Environmental Research and Public Health. 15, 6, 9 p., 1148

Research output: Contribution to journalArticle

Open Access
Referral and Consultation
Postal Service
Research Design


GMS 15 yr

Janssen, X. (Creator), Reilly, J. (Creator), University of Strathclyde, 2016