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>> I still find it astonishing that they can build an amplifying powerful
>> enough and sensitive enough to detect the absurdly small electrical
>> currents, diluted across vast distances in space, and yet *not* pick
>> up the sea of EM interference in the room... Pretty amazing stuff!
>
> EM (if you mean computers, mobile phones etc) is not the problem
> generally, mains power supply is.
Yeah, I guess most EM is too high-frequency to interfere with the
signals of interest... (A normal heatbeat is, what, a few Hz?)
>> No. I'm just curios. (Personally I wouldn't even know a T wave from a
>> U wave...)
>
> The T is the slow part after the QRS, the fast part with the highest
> excursions. The U wave may be after that. It is not present in every
> lead and not in every person. Frankly, no one knows what generates it.
I find it... uh... "interesting" how many medical effects nobody
understands. Like, apparently nobody actually knows why menthol works. o_O
>> Sure. But I'd imagine you still need to shave your head to get them
>> anywhere near your scalp.
>
> No. small electrodes fitted with conduction glue like material IIRC
...which is what I was expecting for the ECG. But apparently not.
>> Yeah - the soft, tender part in your elbow. What, they couldn't find
>> anywhere more painful? :-S
>>
> Ah, it seems we have found a biological abnormality here. FYI, in most
> people the density of nerve endings in the elbow is much less tjan in
> the fingertips.
See my other reply. Fingertips have to be tough. Elbows don't.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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