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I'm a climber, so I'm talking specifically about forearms. I train regularly and have been for years, so I'm pretty familiar with how my body responds.

As I understand it, the "pumped" sensation in the forearms comes from the anaerobic energy usage; it's build of lactic acid. During my training session yesterday, I experienced more onset of a pump than usual. I would say it seemed that I was getting pumped, doing exactly my same warm ups and workout as I have been doing regularly for several weeks, at about 80% of the normal threshold.

I know that if I don't warm up good, it sets in faster. But my warm up was as complete as usual. What I want to know is what other parameters can affect this? Was I low on blood sugar? Were my muscles still fatigued from previous workouts? Did the cold I had just recovered from matter?

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I'm not sure if I get your point, but as far as I know, the "pump" effect comes from accumulation af water in your muscles, and not from lactic acid. –  zero-divisor Dec 13 '12 at 21:01

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Muscle "pump" is nothing more than increased blood flow into a muscle from exertion. If you have a higher pump sensation than usual, then I'd look at something else as the cause. More caffeine or salt than usual, dehydration, other factors that would contribute to this.

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