Categorical answer modes provide superior validity to open answers when asking for level of physical activity: A cross-sectional study

Validity of the Global Physical Activity Questionnaire (GPAQ) in assessing levels and change in moderate-vigorous physical activity and sedentary behaviour

(2014) Claire L Cleland et al.   BMC PUBLIC HEALTH

Accelerometer-Determined Physical Activity and Its Comparison with the International Physical Activity Questionnaire in a Sample of Nigerian Adults

(2014) Adewale L. Oyeyemi et al.   PLoS One

What physical activity surveillance needs: validity of a single-item questionnaire

(2013) Miriam Wanner et al.   BRITISH JOURNAL OF SPORTS MEDICINE

Actigraph GT3X: Validation and Determination of Physical Activity Intensity Cut Points

(2013) A. Santos-Lozano et al.   INTERNATIONAL JOURNAL OF SPORTS MEDICINE

Aerobic Capacity Reference Data in 3816 Healthy Men and Women 20–90 Years

(2013) Henrik Loe et al.   PLoS One

Self-reported leisure time physical activity: a useful assessment tool in everyday health care

(2012) Lars Rödjer et al.   BMC PUBLIC HEALTH

Can a single question provide an accurate measure of physical activity?

(2012) Karen Milton et al.   BRITISH JOURNAL OF SPORTS MEDICINE

Intermonitor Variability of GT3X Accelerometer

(2012) A. Santos-Lozano et al.   INTERNATIONAL JOURNAL OF SPORTS MEDICINE

A new submaximal cycle ergometer test for prediction of VO2max

(2012) E. Ekblom-Bak et al.   SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS

Does a variation in self-reported physical activity reflect variation in objectively measured physical activity, resting heart rate, and physical fitness? Results from the Tromsø study

(2010) Aina Emaus et al.   SCANDINAVIAN JOURNAL OF PUBLIC HEALTH

Physical Activity Questionnaires for Adults

(2010) Mireille N.M. van Poppel et al.   SPORTS MEDICINE

Physical Activity in the United States Measured by Accelerometer

(2009) RICHARD P. TROIANO et al.   MEDICINE AND SCIENCE IN SPORTS AND EXERCISE