What Fatigue Reveals About Your Results

Your client tests a hip rotation: ten degrees less on the left than on the right for months. You step in, you stimulate, you retest, and the ten degrees are there. He's surprised; you, not really.

Two weeks later he comes back, puzzled: "It was fine the next day, but by the third workout I felt I was going backward." The usual answer is to intervene again and reproduce the result, without asking the real question: does the result hold, or only when conditions are good?

A state, or the system?

The value of a result is measured under constraint, far more than at the moment it appears. A gain that disappears as soon as speed goes up or fatigue sets in has changed a momentary state, without changing the system (how long the effect of a stimulation lasts).

Yet many demonstrations take place under controlled conditions, on rested subjects. What is rarely shown is what happens next, when the body goes back to its usual load and the old pattern takes over again.

Test-retest under constraint

Most approaches resemble a mechanic who checks that the engine idles, then hands back the keys: it runs, but the client drives on the highway. Functional proof follows three steps:

• a change that is visible right away, which the client measures himself

• a change that shows up in his real movement

• a change that holds with speed, load and fatigue

Motor learning documents this clearly: a pattern acquired within a narrow window of conditions breaks apart as soon as they change, as long as it hasn't been consolidated within variability (we train in calm, we play in chaos).

The hierarchy is simple: a good test is worth more than a nice explanation, good transfer is worth more than a good test, and stability under fatigue is worth more than both combined.

"I had done half"

In training, the exercise often produces the same moment. Participants test a result under usual conditions: it holds. They add a light load, a moderate speed: depending on the case, the result holds up or collapses. A strength and conditioning coach with several years in the field went through it, then summed it up: "I thought I had done my job. In fact, I had done half." It was a clarification, and it lastingly changed the way he chooses his levers.

What you prove under easy conditions, anyone can show. What you prove under fatigue is a result.

To understand how to make learning stick, the pathway "How we learn to move" is free, and so is the introduction to RNP, Neuro-Postural Reprogramming.

You're a practitioner and you want to know whether the training is right for you: book a call with the team.