Lactic acid in arms during training

A quick question about lactic acid buildup in arms. I'm currious about this: Has anyone else had the feeling of lactic acid buildup in your arms - especially biceps, triceps, shoulder - when doing
a) Apneawalks
b) Doing very intense running

I'm especially curious about the running thing... Since arms are not really used a lot when running, I'm surprised that I get the distinct feeling of lactic acid buildup... I would think that oxygen could easily get to the arms, even if legs are in need... Or could it be the high CO2 that triggers a sort of dive respons when running (wich would explain the apneawalk-buildup)?

The running is very high intensity for a few minutes (max-puls or very close to)... funnily lactic does not really build up a lot in legs, about the same level as arms I'd say.

After my last fitness session running, my arms felt like they had done heavy weightlifting...

Anyone tried something like that, and/or can explain the process behind (low O2? high CO2? Diverespons?)

100 views... Is there really no one else who noticed something like lactic burning in arms during (even fairly moderate) apneawalks or high intensity training...

I'm starting to worry I got some kind of medical condition...

Hey, sorry for the late reply.

I think you might be right, or that it has something to do with that at least. Allthough it does sound quite strange that it's possible to get bloodshift during maximum heart pumping...

Kind of sound possibly unhealthy too - I mean if heart is at max-rate both bpm and stroke-volume and bloodflow in arms are restricted at the same time... Could equal a really high bloodpressure...

Unless the heavily working legs can somehow manage it all - then it might even be better for the running, since needed bloodflow and oxygen will only go where it is used: The working legs.

Interesting thing anyway

cdavis just to add a piece to the puzzle, I think you might be right about the bloodshift feeling: Yesterday I found out that I can replicate the feeling of weakness/emptiness in just a few seconds. If I walk, then exhale fully, then reverse pack 5-10 times, and then keep walking for app. 10 seconds everything starts to "fall down" inside me, and the arms and even legs feel empty the same way... After only 10-20 seconds it can not be low O2... So it might be something regarding the parasympathetic nerveous system or the bloodshift...