Sjaan is working as a Research Fellow in the Centre for Research on Exercise, Physical Activity and Health group in the School of Human Movement Studies. Sjaan completed her PhD at the University of South Australia in the Health and Use of Time group in 2013, experimentally testing the activitystat hypothesis in previously sedentary adults. The activitystat hypothesis proposes that physical activity and/or energy expenditure is regulated to a biologically determined set point. This infers that if physical activity and/or energy expenditure is increased in one domain, such as commencing a new exercise program, there will be a compensatory decrease in another domain.
Sjaan's current research interests include time use and how this influences health, the measurement of use of time and physical activity/energy expenditure, new generation eHealth devices (eg. Fitbit, Jawbone) for physical activity behaviour change and university student health.
Sjaan's work to date has been quantitative, including measurement development and validation, systematic reviews, intervention and randomised controlled trials and longitudinal observational studies. She has experience in measurement of use of time, physical activity and energy expenditure, including the application of doubly labeled water, the gold standard method of measuring energy expenditure in humans.