"measure physical activity" is correct and usable in written English.
It can be used whenever you need to refer to measuring someone's physical activity. For example, "We have developed a new system to measure physical activity in athletes."
To be able to accurately measure physical activity we used accelerometers that record active and sedentary periods during everyday life for one week.
"The survey did not measure physical activity.
Here we leverage the wide usage of smartphones with built-in accelerometry to measure physical activity at the global scale.
The participants agreed to wear accelerometers periodically to measure physical activity over the 13-week experiment.
Monitors to measure physical activity were given to 40 children aged nine and 10 from four primary schools across the UK, to wear for a fortnight.
Brage S, Ekelund U, Brage N, Hennings MA, Froberg K, Franks PW et al. Hierarchy of individual calibration levels for heart rate and accelerometry to measure physical activity.
Jawbone, also based in San Francisco, has released the Up, a wristband that communicates with an iPhone and can also measure physical activity and sleep patterns.
Many scales have been used to measure physical activity in general populations, but most existing scales may not be easily applied to individuals with mental illness.
The International Physical Activity Questionnaire Short Form (IPAQ-SF) is a self-report questionnaire commonly used in patients with rheumatoid arthritis (RA) to measure physical activity.
Few studies measure physical activity objectively or at multiple time points during postpartum.
To measure physical activity level, the questionnaire Physical Activity Scale 2.1 (PAS 2.1) was used [35].
