Actiheart User Manual 5.1.31 (Jun 2022)
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4.4.8.2
Sleeping
Heart Rate
It is possible to enter a value for measured sleeping heart rate in this screen.
Once saved this will overwrite whatever value was entered for that user in the
database when the user was created. If required, the software can calculate this
from an overnight recording and save that directly. This is the recommended
method (see
4.4.8.3
Maximum
Heart Rate
An estimate of HR max may have been entered into the database when a user
was created. This screen allows one to alter the initial value, or to use the
Tanaka equation as an estimate
2
. This is 208
– (0.7 x n) where n = age of the
subject. Selecting the ‘Tanaka’ option will allow the estimate to be generated
separately for each recording, using the subject’s age at the time of each
recording.
Note that the maximum heart rate is not used for Energy Expenditure
calculations, only for producing an estimate of VO2 max.
4.4.8.4 VO2
Max
This parameter is a measure of an individual’s fitness. It is calculated
automatically when a Step Test is performed. See
this is calculated.
VO2 max is calculated from the value of PAI when the heart rate is equal to HR
max. To calculate proceed as follows:
•
Select the calibration curve i.e. Step Test or Other HR
•
Ensure that any calibration data extends to the end of the table. If real
data
•
is not available use the Fill function which will extrapolate in a linear
manner.
•
Ensure that the HR max field has a value.
•
Double click on the VO2 max. This brings up a confirmation message to
continue the calculation with the currently selected tab for HR-EE
calibration.
Selecting Yes will input a value into the VO2 box.
The VO2 max value is stored with the user information in the database. This is
the last value calculated either from the Step Test or from the Individual
Calibration. Only one value can be accommodated.
When entering a table of values for the EE calibration, all boxes must be filled
either directly or using the Fill function after a few key points are entered. If the
table
s’ values doe not increase monotonically with each box, the software will
refuse to save it as the calibration cannot be applied regularly.
2
Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J `Am.Coll.Cardiol. 2001; 37(1):153-56.
