The energy charge of a cell is basically the ratio of ATP molecules to Amp molecules. So if the energy charge of the cell is high that means we have a high ATP value relative to Amp. If the energy value is low we have a low ATP ratio relative to Amp. And these are the two Alistaire regulatory molecules of phosphor fructokinase. So let's suppose we're at rest. And what that means is our muscles aren't actually contracting.