Doctoral dissertation

• Kieffer, Sophie Kvalheim (2023). Personal Activity Intelligence - the road map to a healthy body mass index and a longer life. (external link)

Academic article

• Kieffer, Sophie Kvalheim; Nauman, Javaid; Syverud, Kari et al. (2021). Association between Personal Activity Intelligence (PAI) and body weight in a population free from cardiovascular disease - The HUNT study . (external link)
• Kieffer, Sophie Kvalheim; Zisko, Nina; Coombes, Jeff S. et al. (2018). Personal Activity Intelligence and Mortality in Patients with Cardiovascular Disease: The HUNT Study. (external link)
• Kieffer, Sophie Kvalheim; Croci, Ilaria; Wisløff, Ulrik et al. (2018). Temporal Changes in a Novel Metric of Physical Activity Tracking (Personal Activity Intelligence) and Mortality: The HUNT Study, Norway. (external link)

See a complete overview of publications in Cristin.