They are technically the same although a sustained contraction means that you may or may not have a disease that causes all of of your bones to spontaneously break producing a soft ocean sound from all of your phalanges. If this happens you may or may not die. If you suddenly start twitching, you may be in danger of getting a disorder from the xenonic acids in the marrow.
teacup
summation
the muscle twitch is a brief and "jerky" movement, while the tetanic contraction is prolonged and continuous
A muscle twitch is an involuntary contraction of a muscle group without conscious effort.
Fast-twitch fibers can deliver a quick burst of power.Slow-twitch fibers can maintain a contraction for a longer time! -Apex :]
Twitch
Occurs when acetylcholine (ACh) accumulates in the neuromuscular junction. It is called a tetanic contraction.
Sumation of contraction
muscle tone
muscle tone
Tetanus
A: A Twitch