Re: Respiration and Electrocardiograms [HAPP-L]

[Harold Grau <hgrau@xxxxxxx>]

HAPPsters,
	FWIW, just yesterday, in our ECG lab, when I had the subject 
breath-hold (I always ask the students what they think will happen to 
heart rate during breath-holding), we also saw a decrease in the size 
of the signal (using limb leads, metal plates - old fashioned stuff!).  
Because of the extra intrathoracic volume?

Harold Grau

> The effect that is observed in these Biopac experiments is called
> respiratory sinus arrhythmia. ...

> The change in voltage observed in the Biopac figure could simply be 
> due to
> movement of the electrodes during the repiration so that their 
> positions
> relative to the ECG vector have changed.  I doubt that that is
> reproducible, but the change in heart rate is almost always present.


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