
Originally Posted by
CowPimp
Electrolytes are ions used in generating action potentials. An action potential is an electrical signal initiated by your nervous system that excites a cell. In the case of a muscle cell, it leads to contraction.
The reason a lack of potassium could be the issue (Though it's probably not, if you are eating 2-3 bananas a day) is that when the cell membrane permeability to sodium increases and it rushes into the cell and depolarizes and hits critical thershold (The voltage difference between the outside and inside of the cell membrane changes enough for an action potential to occur), potassium is then supposed to rush back out of the cell to repolarize the cell membrane voltage differential and return the cell back to a resting state.
Hopefully I didn't fuck that explanation up, heh.
Referring to compensation, P is talking about when a muscle tries to do the work of itself, plus the work of another muscle that is too weak and neurally inhibited to do it's own job properly. This increased workload causes a muscle to become overactive, and subsequent cramping could occur as a result.