
Originally Posted by
shifty_git
Like morph said, short chained esters are more irritating to muscle fibres. (to do with size)
So as the muscle then breaks down a prop ester quicker that 'sting / pain / irritation' is released in a quicker burst, so will be more intense as its a higher dose of pain in a short amount of time.
Long esters themselves are less painful, and then released over longer amounts of time - so feel much easier.
This is why then obviously as the concentration is increased, something like a prop ester will have a much more noticeable effect than say an enan ester.