Summary
An Individual’s capacity to shuttle out metabolites between and during repeated bouts of high intensity exercise is paramount for maintaining speed, power and coordination. As a game gets closer to its end, the players are using an increasing percentage of the phospho-creatine energy system, but the recovery of those uses during the bouts of sprinting that occur during a player’s shift are reliant upon aerobic energy systems to resynthesize the phospho-creatines. In today’s game it is not enough to keep your feet moving for three periods you have to remain explosive.
Good source to start with
https://onlinelibrary.wiley.com/doi/full/10.1111/sms.14284