why do our our arm and hands shake when exerting max effort?

Question

An example of that would be when we try to grip on something as hard as we can, our hands would shake.

In: 221

Answer 1

Your muscles are made up of lots of little velcro like hooks and loops called actin and myosin fibers. These work together to make a muscle contract, but each individual fiber can only contract for a small period of time (usually much less than a second), so in order to make a smooth movement your brain and nerves tell a small number of them to contract at a time, then the next few, then the next few, and so on. For movements requiring only a small amount of strength, this works fine. However, when you are straining you “use up” a large portion of your muscle fibers contraction ability all at once, so there aren’t any fibers left to make the muscle movement smooth, causing the shaking you notice.

Answer 2

Your muscles are made up of lots of little velcro like hooks and loops called actin and myosin fibers. These work together to make a muscle contract, but each individual fiber can only contract for a small period of time (usually much less than a second), so in order to make a smooth movement your brain and nerves tell a small number of them to contract at a time, then the next few, then the next few, and so on. For movements requiring only a small amount of strength, this works fine. However, when you are straining you “use up” a large portion of your muscle fibers contraction ability all at once, so there aren’t any fibers left to make the muscle movement smooth, causing the shaking you notice.