My both hands are really shakey. Starting in the middle of the workout and ending after five hours.
Why do they shake? What doest it mean? And is it normal?
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It is rather common as far as post-workout complications go, and is not, to my knowledge, an indicator of more serious problems.
Your skeletal muscles are controlled by motor nerves. Each motor nerve controls a large group of muscle cells. Of importance is that these groups overlap, each muscle cell is capable of receiving commands from more than one motor nerve.
As a large muscle contracts under normal circumstances, the nerves fire off one by one, creating a tight pattern that gives the illusion that the muscle as a whole is moving smoothly.
As fatigue sets in, some motor nerves are knocked out of action. As the muscle cell groups overlap, the muscle can still contract, but since there are now fewer neurons handling the muscle as a whole, the illusion of the contraction being smooth is damaged - the muscle moves in jerks.
Most people notice this most easily in the hands, as this is an area where we are used to having a very fine degree of motor control. Some notice it the most in the largest muscles (such as the quadriceps), as those muscles have a great number of muscle cells compared to the number of neurons to begin with.
Once the nerves are adequately rested, normal motor function resumes.
People have reported quite a few things that seem to aggravate post-workout trembling, and their direct solutions:
Caveat: I am not a doctor. I am an amateur working from my memory of an article that I can't find any more. If the trembling is causing you discomfort, is chronic, or is verging on being full-on spasms and/or seizures, I suggest you see a doctor.