Before telling you this i wanna aware you about a term SAID: Specific Adaptation to imposed demand i.e if you put stress on muscles it will adapt itself to that stress by strengthning itsef. SAID is also seen in neuaral activities and in connective tissues.
Lets understand little muscle anatomy
If you want know how muscles contract understand it in molecular level.
In muscles cell there are two threads myosin and actin which always remain overlap and they exert force on each other by crossbridges. These crossbridges are part of myosin which pulls and shuffle on actin to contract muscle.
I’ll discuss muscle anatomy in different blog.
Now when it relaxes it muscles get lenghthened and in full range of motion it lenghthened to extreme which lessen this overlap.
Understand what happen when muscles are fully lengthened( in full raange of motion)
As you know when muscles are contracted the actin and myosin act force parallely by overlapping and by making crossbridges on each other,now when the y are relaxed they are fully lengthened overlapping is not enough, at this moment strength of muscles are low. At this this moment when muscle try to contract it will adapt itself to that same stress by increasing size and strength.
Im not saying you can’t make muscle strong or increase size if you don’t do full range motion but by doing so you put your muscle more vulnerable to stress and that is why full range exercises are important.
So basically full range of motion activate more muscles and also increase effectiveness of that specific exercise.
Second thing full range of motion is good for flexibility.
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