The total amount of time when
the recording did not take place
– such as at the start or end of
the recording (for example the
difference between 00:00 and
the start time or the end time and
24:00).
10.3 Set Calibration
It is possible to set the calibration for the intensity of
activity used in classification. This can be done by clicking
the Tools menu on the Day Summary and selecting the
“Set Calibration” function.
The analysis function uses a calibration to derive reference
thresholds for vigorous, moderate, low and sedentary
activity types. These values differ from patient-to-patient
depending on their capabilities, so it is desirable to perform
a calibration for each patient or recording (where
applicable).
The best way to calibrate a recording is to arrange for the
patient to perform a brisk walk (3-4 mph) for at least 5
minutes. This should take place at the start, or at the end
of a recording to ensure that it is easily identifiable when
selecting it in the calibration window [1].
The calibration period can be selected by either clicking
the highlighted period in the activity graph [2], or by
selecting a reported period in the detected periods list [3].
The selected period will use an average of the activity
counts found within the period to produce the moderate
threshold. This value will also be used to derive the
vigorous and sedentary thresholds. The low threshold
accounts for any values found between the sedentary and
moderate thresholds.
The entire recording will be analysed to detect any bouts of
activity which are longer than 5 minutes and who’s activity
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