Actiheart Guide to Getting Started 5.1.11 (Feb 2020)
15
Rauharju et al.
1
breast tissue appears to have a practically negligible effect on
ECG amplitudes, and in women, the placement of chest electrodes on the breast
rather than under the breast is recommended in order to facilitate the precision of
electrode placement at the correct horizontal level and at the correct lateral
positions.
1. Rautaharju PM, Park L, Rautaharju FS, Crow R.
A standardized procedure for locating and documenting
ECG chest electrode positions: consideration of the effect of breast tissue on ECG amplitudes in women
. J
Electrocardiol. 1998 Jan; 31(1):17-29.
5.4 Positioning of
the Actiheart
For good accurate measurement of activity the Actiheart needs to be placed with
the top edge of the device body as near to horizontal as possible. A 10 degree tilt
(Fig. B) gives a theoretical activity reading error of 3% for vertical movement.
However, a 45 degree tilt would mean that the detected magnitude is 30% less
than the actual for vertical movement. The electrodes should be positioned so
that the cable is nearly stretched to its full length (Fig. A). This will avoid
unnecessary rotation of the sensor in situ. The diagram below shows an
illustration of this:
Direction of
Vertical Motion
Accelerometer
Orientation
Fig A
Fig B
Tilt Angle
Measured a = v cos(tilt)
(vertical only)
