I see this every day in my clinic.
A patient comes in with pain – knee, Achilles, shoulder.
The description is often similar: "It was fine at first. And then it suddenly got worse."
But that "suddenly" has its logic.
And very often, it's related to collagen – specifically, how it behaves under stress, during fatigue, and during regeneration.
1) Why the problem only appears at the end of a workout
At the beginning of movement, the body functions "smoothly."
Muscles have energy, coordination holds, movement is under control.
But with increasing fatigue, something changes:
- the muscle stops being able to control movement
- stabilization worsens
- part of the load shifts to passive structures
And here comes the crucial moment:
tendons, ligaments, and collagen are not prepared to take over the role normally held by the muscle.
The result?
- overload
- microtrauma
- pain that appears only at the end – or after the workout
Fatigue isn't just about performance.
It's the moment when the weakest link in the system shows up.
2) Why returning without pain is not returning without risk
This is one of the most common mistakes I see.
A patient says:
"It doesn't hurt anymore, so I started running/exercising again."
But:
- muscles recover quickly
- movement subjectively "feels good"
- but collagenous structures heal for weeks to months
The pain disappears before the tissue is ready.
And what happens then?
- the return to loading comes too soon
- the structure can't keep up
- the problem returns – often more intensely
Pain is a signal.
Not proof that everything is alright.
In practice, this means one thing:
returning to sport must respect the biological time of collagen, not just the current feeling.
3) Hypermobility: why stretching often worsens the problem
Another common scenario:
The patient is hypermobile.
And intuitively starts… stretching.
But:
- the joint already has excessive range
- stretching increases it even further
- stability is further reduced
The result?
- higher demands on movement control
- greater load on passive structures
- higher risk of overload
A hypermobile joint doesn't need more range.
It needs:
- better control
- stability
- quality support in structures
Stretching without control is often a step in the wrong direction for hypermobility.
What all these situations have in common
Whether it's:
- fatigue at the end of a workout
- returning after pain
- hypermobility
the same principle always repeats:
the load gets transferred to structures that adapt the slowest
Collagen has a different dynamic than muscle.
It reacts slower. It rebuilds over a longer period.
And if you overload it before it's ready, the body "remembers" that.
What to do about it in practice
From my experience, a combination of three things makes sense:
-
Load management
Don't increase performance just by feel, but according to tissue tolerance. -
Stability and movement control
Especially with hypermobility. -
Support tissue quality
Long-term, systematically.
Where Kolagin® makes sense
Kolagin® is built on supporting structures that:
- hold the joint during fatigue
- can't keep up with a premature return
- ensure stability in hypermobility
It doesn't just address "feel."
It works with the structure.
More information can be found here: www.kolagin.com