QUOTE (Jakeshorts @ Apr 2 2008, 07:20 PM)

I'd love to discuss, but I have no idea what you're talking about.
Here we've had numerous reports of back pumps while not doing anything but maintaining posture. I've never had shin splints, calf pumps, ab/oblique pumps, or any other muscle associated with posture pump up so intensely it's painful except my spinae erectors.
Just saying shin splints can occur doesn't really say much other than conjecture which no one has supported and even if they did it still explains nothing.
The neck is constantly exerting effort to hold your head up. It doesn't balance on top of your spine and is a vertically erect muscle... Much like spinae erectors.... Again, I'm confused where you're coming from as I'm not sure I understand what/where your theory on the cause is...
Appologies. I'd written the above too quickly, and you'd picked on my statement of:
QUOTE
So anything which requires the contraction of the Spinae Erector (From deads, to standing OHP etc) will contribute in some part to a lower back pump.
When the statements of its the same as any muscle pump and fluid retention statment was the more important one. My bad. I never was good at multi-tasking.
Ok.
On cycle you will have increased fluid retention, and increased blood plasma volume & RBC.
So the painful pumps are a result of having increased fluid retention.
High Carb diets - as are common on cycle - will increase glyogen storage and thus water retention.
Shins / Calves / Spinae Erector all seem highly susceptible to getting bad pumps, whether you have been training them or not. These muscles are flexing and contracting all the time.
For whatever reason Abs/Obliques/Psoas/Neck etc don't seem to get pumped. This will either be because they are not flexing and contracting all the time, possibly due to muscle depth or muscle fibre type.
I've never had a pump in my abs when training them for example... They just burn when trained hard.
If that still doesn't make sense then I shall just have to go and hide under a rock