Why Do Our Fingers Shake When We Hold Something Heavy? | RapidSmartFacts

Hold a heavy object, your fingers may shake. This isn’t weakness;

it’s your control system at its limits. Your brain sends rapid signals to

muscle fibers for grip. Fibers don’t pull at once; they switch on and

off in motor units. With light objects, adjustments are small and smooth.

With heavy objects, the system works much harder. As muscles fatigue, force output becomes

uneven. That unevenness causes tiny shakes in your fingers. The longer you

hold it, corrections stack up. Stress, caffeine, lack of sleep

make tremors worse. For healthy people, shaking stops once load is gone and muscles recover.