: Data-Field 4205

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Data

266,989 items of data are available, covering 226,509 participants.
Defined-instances run from 0 to 3, labelled using Instancing 2.

Average compound dataset is 771b, largest is 841b.

4 Instances

Instance 0 : Initial assessment visit (2006-2010) at which participants were recruited and consent given
170,629 participants, 170,629 items
Data not meaningful for statistical summary

Instance 1 : First repeat assessment visit (2012-13)
20,222 participants, 20,222 items
Data not meaningful for statistical summary

Instance 2 : Imaging visit (2014+)
69,477 participants, 69,477 items
Data not meaningful for statistical summary

Instance 3 : First repeat imaging visit (2019+)
6,661 participants, 6,661 items
Data not meaningful for statistical summary

Notes

Wave data containing 3 waveforms, each consisting of one direct and one reflected component.

A digital volume pulse can be considered to be the summation of a direct and a reflected component. The direct component is due to transmission of a pressure wave from the left ventricle to the finger via the most direct route. The reflected component is formed by pressure transmitted from the heart to the lower body where it is reflected back up the aorta and thence to the finger. Each waveform is actually a single pulse with 100 points. Since the heart rate is in beats per minute, a single beat takes 60seconds / Heart Rate and time between two beats is (60/Heart Rate)/100.

The data is formatted as follows:

The first number (i.e. digits before the first '|' character)indicate the number of points X,Y for the curve.
Each pair of X,Y values is separated by a '|' character from the preceding/succeeding pair.
Each pair of X,Y values is separated internally by a ',' character.

The X-axis is the time in milliseconds and the Y-axis is the Pulse signal strength in arbitrary units.

0 Related Data-Fields

There are no related data-fields

6 Resources

Preview	Name	Res ID
	Arterial stiffness pressure curve example	4
	Arterial stiffness probe	100099
	Arterial-stiffness measurement using ACE	100240
	Participant answering other-illness question during interview	8601
	Screenshot of arterial stiffness procedure	100180
	Screenshot of arterial stiffness results	100181

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