Shouldn't the Phosphagen system continue running along the bottom of the time axis? My teacher said at all times, all energy systems are contributing, so although the contribution from phospagen is minimal, the line should continue along?
Harder to find then I thought. I suppose it is just good to keep in mind that for extended efforts the ATP-PC system contribution is the lowest of all energy systems ~1%. Sorry for not finding a graph, you are welcome to share one if you have one :)