Minutes are a bad way to measure squad fatigue

Two players with identical playing time can arrive at the same week in completely different physical states.

A centre back plays ninety minutes in a match his team controls with seventy percent of the ball. A pressing forward plays ninety minutes chasing a side that sits deep and passes around him. Same number in the column. Nothing else about the two afternoons is comparable, and any workload model built on minutes will treat them as identical.

The obvious fix is distance covered, and it is only slightly better. Distance is dominated by jogging, which costs relatively little. What actually depletes a player is high-intensity work: accelerations, decelerations, changes of direction, sprints above a threshold. A midfielder can cover twelve kilometres at a comfortable pace and be fine on Wednesday. Another can cover nine with forty hard accelerations in them and be nowhere near ready.

Deceleration is the part most often left out and I would argue it is the most important. Braking loads are eccentric and they are what leaves muscles sore two days later. A winger who repeatedly sprints and then stops hard to defend a full back is doing far more damage than the raw sprint count implies, and most public conversation about workload never mentions it at all.

Then there is the recovery side, which is where minutes really break down. Travel matters, in a way that is well documented and routinely ignored by fixture planners. Time zones matter. Kick-off time matters, because a late evening match compresses the sleep of everyone involved, and sleep is the single largest recovery input a club has and the one it controls least.

So when a manager complains about the schedule, the useful question is not how many matches his team has played. It is how many hard sessions and matches with fewer than seventy-two hours between them, how many involved a flight, and how many of the affected players are the same ones every time. The load is never spread evenly. It concentrates on four or five players who play every competition, and those are precisely the ones you cannot afford to lose.

Clubs with good analysts know all of this. The public debate is still conducted entirely in matches played, which is roughly like assessing a driver's tiredness by counting how many roads he used.