In a message dated 2/10/00 7:27:32 PM Pacific Standard Time, Tivers writes:
>
> Left vetricle diameter tracks inversely with contractile fraction (what
> percentage of the ventricle closes with contraction) at rest. Don't know
> what it does at work. Fred Fregin still likes the QRS duration method of
> heart scoring--says it tracks very well with performance. Wouldn't an ECG
> show a bigger contractile spike for a larger muscle mass--like an
> electromyogram does?
>
Wow, never thought of using QRS. Does the QRS duration change when measured
over a course of exercise or does only the frequency increase?
Don't know about contractile spikes--will look into it today. Shouldn't be
any species differences in electric conductivity so will check all.
Carol Wingate