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•
Accel XYZ:
The acceleration is shown for all 3 measured axes. The X-
axis is left-right on the body, Y is up-down, and Z is back-front oriented.
These channels will typically consist of long regions of relatively "flat" data
as the wearer is inactive, interspersed with much higher magnitude
movement periods, then more "flat" data but with changed levels as a
new inactive period with different overall orientation has been assumed
by the wearer.
The above data channels all relate to original raw data recorded by the device.
Channels below are summary results derived from that raw data:
•
BPM:
The heart rate (Beats Per Minute) data is derived once per second
regardless of the heart rate and is displayed in red. The rate is averaged
over several seconds to give a better indication of overall heart rate rather
than individual beat changes. It is shown as zero where there is
considered to be any break in the reliability of the signal available.
•
IBI:
The Inter-Beat-Interval (IBI) data is displayed in orange. This shows
the time interval between every single beat, rather than an averaged rate
of heart beats. This graph often better illustrates the changes of heart rate
variability in its upper and lower envelope during different activities than
the BPM graph does.
•
Movement:
This is a measure of the amount of overall movement in each
second. It is calculated in the same manner as activity counts from all
other analysis screens. It provides a good quick overview of when and
how much physical movement has occurred.
•
Rotation / Upright:
representing the standing / laying down position on the Upright data row.
The rotation of the body when not vertical is shown using a red/green bar,
where red denotes the left should and green the right. This allows you to
see clearly which side the wearer was lying on, particularly when asleep.
These orientation diagrams are not available when the wearer was
moving.
•
Active / Resting / Laying:
the user's status is shown as Active, Resting or Laying down. This status
is used later for HRV analysis.
The left mouse button allows you to quickly select a region either to zoom in to
that data, or to concentrate on that period in the "ECG Average" tab. Once
selected, the period is highlighted on the display and the start and end times
given in the "Selection start / end" boxes towards the bottom of the window.
Selection start and end times can be dragged using the mouse without re-setting
the entire selection period. The selected period can then be zoomed exactly
using the "View Selection" button, and also becomes one of the analysis periods
available on the second tab "ECG Average".
The Export menu provides spreadsheet-suitable export of the data visible in the
Waveform Viewer. This is broken down into the heart rate & movement derived
data, which is on a simple one second basis, and the acceleration data which
contains many more samples. Note that ECG data for a selected period is
available from the ECG Average tab. Raw ECG data for the whole recording is
also available through the Info button from the recordings list window rather than
an analysis window.
Actiheart User Manual 5.1.31 (Jun 2022)
The orientation of the user is shown with a black bar
Using the Actimetry and the orientation data,
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