Tiredness is a symptom that may take a long time to happen for well trained individuals in sports. But things like athlete fatigue are considered factors in any game, since constant playing will in time result in this. Those who are aware of this will try to pace themselves or plan their playing times and lifestyles accordingly.
Coaches and management and other mentors will know this of course. That is one reason why they might instruct or advice a sporting young man some weird thing that might seem unrelated to good playing. There is psychology at work here, since inspiration or drive is something that might be curtailed by the fatigue factor.
Knowing this might turn the mind of an athlete into a direction which is not conducive to great games. That is why coaches or managers are there, to guide great players according to schedules. They often create a proven program for maximizing on the youthful energy of players while protecting them from injuries and fatigue.
That is the thing that will help develop the best athletes. All of them may have their own personal best records, and these are in fact how they base their capabilities on. And these may be enough for them, to have these recorded for posterity on the school rolls for instance when they play varsity for any sport.
That will mean that they know they have a limited number of years due to their studies. In fact many if not most sportsmen know that youth is on their side and that retiring during their thirties or forties is the done thing. This is for pros, and for kids, it simply means the number of years they stay in school.
The will lessen the cases in which fatigue figures into the equation. For true professionals this is the thing they bear well, and pace themselves so that they are not over exhausted and unable to perform as needed. They are duty bound to tell their coaches and even consult their doctors before this happens and they fall off the roster.
For many this is a difficult thing, because playing may be the life they have chosen. And it is about income too for pros, and there might not be clauses for fatigue in their contracts. In any case they make the best of what they have if they have it, and that means playing their hearts out every time they can.
This will necessitate some control but not a thing that they should do themselves. They look up to elder sportsmen, men or women who have gone through the wire and have experienced most things in sports. That means they will know when the onset of fatigue and other degradation processes becomes unhealthy for their charges.
They might prolong the careers of these individuals through nurture and care. Care too is something that might hamper the way an athlete plays, usually because he cannot think forward to making great plays. This does not mean that their health is sacrificed, but for pros it is essential to have that killer instinct.