LOINC long common name : PhenX - total physical activity - objective protocol 150801;
LOINC short name : Total phys activity objective proto;
LOINC description : An accelerometer is used to measure the intensity of movements continuously over a
desirable study period (for a robust assessment of free-living physical activity,
a minimum of 4 days is recommended; 7 days of continuous measurement is the most common).
It is generally recommended to select the highest time resolution (or the shortest
epoch) possible to last over the entire study period. Most current accelerometers
have sufficient memory and battery capacity. The participant is asked to wear the
accelerometer during all waking hours of the study period. Most monitors are not waterproof,
and are not recommended for activities such as swimming and showering. An additional
daily record of wearing the monitor can be taken to identify non-wearing time activity.
Data are downloaded from the accelerometer after being retrieved from the participant.
Although this is the current standard for objective physical activity measurements,
more advanced sensor and processing technologies are rapidly evolving in this field
to improve accuracy and expand usability. The hip placements of the accelerometer
(on a belt) have been shown to yield the best prediction of energy expenditure. The
absolute accuracy may vary with different accelerometers, placement locations, signal
filters used by the devices, and models used for predicting energy expenditure or
time spent in certain intensity categories. Follow manufacturers' operation manuals
for installation, initialization, downloading and other specific procedures if needed.;