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I've just read back on it and from what i could find again it does suggest it is blood being recruited by the more active working muscles and then clenching your fists/gripping bars will make it worse. Apparently it is fairly common when lifting weights do to pressure points blocking the nerves. Despite my best efforts i still end up clenching my fists gritting my teeth and screwing my face up when really going hard despite coaches telling me not to do any of those things. It does get complicated as you can seemingly have good blood flow to the tissue body part yet poor blood flow to the nerves in the same area which is where i started getting lost.
Retro_Bastard
Another - I occasionally get a tingling or light pins and needles things in my hands with hard intervals or occasionally in the gym if pushing hard. Never been sure if its a blood-circulation thing or more a muscle tension thing