Neural impulses and chemical reactions. If you really want to know the physilogical processes involved I suggest you pick yourself up a university grade medical/exercise science text book and start reading about energy systems, nueral pathways and processes, the sliding filament theory and the masses of information this will lead you too. Enjoy!
Spasm
An isometric contraction builds tension but there is no joint movement.
An isometric contraction is when the muscle does not shorten and no movement results.
Isometric contraction
An Isotonic muscle contraction is a muscle contraction that makes your limbs move whereas an Isometric contraction is a muscle contraction where the limbs stay static
If the muscle can not shorten because the muscle is trying to move a load that is greater than the force, then the contraction is isometric.
Concentric isometric contraction
Isometric Contraction :]
isometric contractions
An isometric contraction is the name given to a skeletal muscle that does not shorten, but increases tension. The muscles generate force to protect themselves.
isometric contraction
isometric
Isometrics can be given at different angles within a joint range whereas statics are given at beginning of range