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Orchid Win7 v1 <voi### [at] dev null> wrote:
> OK, you can kind of see how standing up uses
> infintesimally more energy than sitting. But you wouldn't expect the
> difference to be large enough to measure.
How exactly do you think the heart is able to pump blood all the way
from your feet to your head when you are standing? By pumping stronger
and faster.
--
- Warp
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On 05/02/2012 15:34, Warp wrote:
> Orchid Win7 v1<voi### [at] devnull> wrote:
>> OK, you can kind of see how standing up uses
>> infintesimally more energy than sitting. But you wouldn't expect the
>> difference to be large enough to measure.
>
> How exactly do you think the heart is able to pump blood all the way
> from your feet to your head when you are standing? By pumping stronger
> and faster.
Again, if the blood reaches all the way to my head when it's 4 feet off
the ground, you would have thought reaching it when it's 6 feet off the
ground wouldn't be that much more difficult.
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Orchid Win7 v1 <voi### [at] devnull> wrote:
> On 05/02/2012 15:34, Warp wrote:
> > Orchid Win7 v1<voi### [at] devnull> wrote:
> >> OK, you can kind of see how standing up uses
> >> infintesimally more energy than sitting. But you wouldn't expect the
> >> difference to be large enough to measure.
> >
> > How exactly do you think the heart is able to pump blood all the way
> > from your feet to your head when you are standing? By pumping stronger
> > and faster.
> Again, if the blood reaches all the way to my head when it's 4 feet off
> the ground, you would have thought reaching it when it's 6 feet off the
> ground wouldn't be that much more difficult.
50% more total height requires at least that much more force, probably
more.
--
- Warp
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>> Again, if the blood reaches all the way to my head when it's 4 feet off
>> the ground, you would have thought reaching it when it's 6 feet off the
>> ground wouldn't be that much more difficult.
>
> 50% more total height requires at least that much more force, probably
> more.
According to Wikipedia, pressure increases linearly as a function of
depth. So, ignoring any change in resistance to blood flow due to the
altered configuration of my body, yeah, 50% more force is required.
It's still an unexpected result.
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On 05/02/2012 5:16 PM, Orchid Win7 v1 wrote:
> Again, if the blood reaches all the way to my head when it's 4 feet off
> the ground,you would have thought
Who would have thought? Not me, not the way you seem to.
> reaching it when it's 6 feet off the
> ground wouldn't be that much more difficult.
Your heart has to pump your blood through your leg arteries with enough
energy to lift it through your thigh veins on the return. There is less
work for it to do when you are sitting down.
Have you ever felt feint when you suddenly stand up? That is because the
blood pressure/flow to your brain drops before your heart can catch up
with the increase of work it has to do.
--
Regards
Stephen
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On 05/02/2012 05:50 PM, Stephen wrote:
> Have you ever felt feint when you suddenly stand up?
Yes - but usually only when I'm dancing.
Like, I dance to the point of exhaustion (not very far, in my case), sit
down for a moment, and then stand up again and- WOAH! OK, I'm sitting
down again...
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On 06/02/2012 9:12 AM, Invisible wrote:
> On 05/02/2012 05:50 PM, Stephen wrote:
>
>> Have you ever felt feint when you suddenly stand up?
>
> Yes - but usually only when I'm dancing.
>
> Like, I dance to the point of exhaustion (not very far, in my case), sit
> down for a moment, and then stand up again and- WOAH! OK, I'm sitting
> down again...
It sounds like you need to get fit but you know that, ;-)
--
Regards
Stephen
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>> Like, I dance to the point of exhaustion (not very far, in my case), sit
>> down for a moment, and then stand up again and- WOAH! OK, I'm sitting
>> down again...
>
> It sounds like you need to get fit
O RLY?
> but you know that, ;-)
YA RLY!
:-(
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Note to self: Walking along snow-covered roads in flat-soled office
shoes. Bad idea.
Although, it apparently affected my heart rate more than you'd imagine...
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On 06/02/2012 01:06 PM, Invisible wrote:
> Although, it apparently affected my heart rate more than you'd imagine...
136 BPM peak, no less. (Although that was probably just that one time
when I slipped and it startled me.) When I sat down again, it was
registering 122 BPM.
I only bothered going because the backs of my legs were tight, and I
wanted to loosen them up. Well, now the fronts of my legs are tight
instead. >_<
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