Validation of the Tracmor, a tri-axial accelerometer, with the doubly labeled water method in children.

The doubly labeled water method is regarded as the 'gold standard' for the
measurement of physical activity. However labeled water is expensive, cannot be
used in large groups and is nog able to measure the physcal activitypatterns.
Accelerometers are, in adults, a good alternative for measurement of physical
activity during the day.
To investigate the use of an accelerometer in three year old children, we are
going to validate it against doubly labeled water.

To compare the physical activitylevel during the daily activities, measured
using the Tracmor 6, a tri-axial accelerometer and the doubly labeled water, in
three year old children.

Non-invasive observational studie

The physical activity level (PAL) during the day can be measured by use of the
accelerometer, Tracmor 6. The Total daily energy expenditure (TDEE) can be
measured using the doubly labled water method. In addition, the basal
metabolic rate (BMR) was determined by the ventilated hood system (Delta Trac).
With the TDEE and the BMR, the PAL measured with indirect calorimetrie, can be
worked out.
By comparing these results, we will find out if a Tracmor 6 is a valid
instrument to measure physical activity in three year old children.

There are no risks associated with the procedures.

The burden for the child is negligible small. The Tracmor 6 is not
uncomfortable. The measurements are non-invasive en not hurtfull to the child.
It cost the parents time to participate in this study. They are informed about
this burden before they start.