Actiheart User Manual 5.1.31 (Jun 2022)
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Customising the
Equations and the
Model
All of the calibration equations and the discriminants and the weighting factors of
the Branched Model are held in a database and can be altered by a user. For a
description of how to do this please refer to
Chapter 1
of this manual.
Branched Model
Adjustment in the
Presence of
Recovered Data
Normally in the branched model the contribution to energy expenditure from
activity and heart rate is weighted epoch by epoch according to certain activity
and HR thresholds. However since the recovered HR data is obviously less
reliable than bona fide recorded data, it may be desirable to override the
branched model default weighting factors with another factor which reduces the
HR contribution. A “Recovered” factor of 25 means that wherever there is
“recovered” data a 25/75 weighting will be applied to the HR/Act respectively in
preference to the default weighting for that epoch.
The Recovery factor must be set in the Settings database to a value between
zero and 100. If no value is entered in the database the program will set a default
value of 25.
Example
In an epoch which falls into Branch 1 the HR would normally be weighted by 90%
and the Activity by 10%. However if the HR data within the epoch is “Recovered”
data and the “Recovered” factor is set to 15 then the HR within that epoch will be
weighted by 15% and the activity by 85%.
Branched Model
Adjustment in the
Presence of Stress
This allows the normal HR data weighting to be reduced where there is a raised
HR in the absence of sufficient activity. This compensation works in a similar way
to the Recovery factor. Again this stress factor overrides the default weighting.
The following criterion is used for deciding whether the raised HR in an epoch is
likely to be due to stress. If the activity in the previous three minutes of activity is
< 25 counts per minute then the stress correction factor is applied. 25 is equal to
the value of X in the Branched Model.
If an epoch where stress is detected has recovered data which has had a
Recovery Factor applied to it then the stress factor will override the recovery
factor.
The stress factor is set in the Settings database. If the box is left empty then the
stress compensation is disabled.
