Parsing power, physiology, and what actually matters when the race gets hard
Most cyclists can name their FTP as casually as their height. It has become the sport’s shorthand identity marker — a metric that promises to define how strong we are, and how fast we should be. It is easy to test, simple to understand, and seductive to compare. FTP carries the aura of objectivity: a clean line separating the rider you are from the rider you want to be.
And yet, in almost every real cycling scenario where performance matters — races, hard group rides, long climbs on tired legs, training camps, fondos, stage races — FTP quietly loses predictive power. I only began to understand this when my own FTP slipped slightly from previous highs… and I became a better rider anyway.
Not just stronger in a laboratory sense, but stronger in the places cycling truly happens: late in hard rides, deep into races, and on repeated climbs where fatigue, not freshness, is the background condition.
That transformation wasn’t accidental. It came from deliberately changing my physiology, not chasing the number most cyclists obsess over.
FTP and the problem of context
FTP is a meaningful number — but only under circumstances that almost never describe real life. It represents a fresh benchmark of sustainable power under controlled conditions. It does not tell you:
- what that power costs metabolically,
- how repeatable it is after fatigue,
- or how long it can be expressed once the body is stressed.
It also doesn’t reveal whether the same output produces a small trickle of lactate, or a flood that the body cannot recycle. Two riders can share the same FTP and sit in completely different metabolic states. One may ride comfortably at high aerobic efficiency, while the other is sitting on the edge of their clearance capacity, seconds from drowning in acidity.
One number cannot distinguish the difference. Yet in most cycling circles, it is treated as the deciding variable.
The physiological factors FTP cannot see
If cycling only happened once — one sustained effort, on fresh legs, under ideal fueling and pacing — FTP might be an excellent predictor of performance. But cycling demands endurance under strain. Efforts happen after surges, in the heat, under partial glycogen depletion, and sometimes on the third or fourth day of training volume.
There are three physiological characteristics that FTP does not measure and that repeatedly determine who is strongest when riding is hardest:
- Where your LT1 sits — the power at which blood lactate begins to rise from rest
- Your ability to clear lactate at and above threshold
- How much threshold power you can still express when fatigue has accumulated
These three factors explain why a rider with a slightly lower FTP can be faster and more resilient than someone whose fresh-state testing says they should be superior.
My own numbers, plainly
When I began to examine my physiology through proper lactate testing, I saw the shift happen in a way that power files alone could not explain.
Earlier in my riding history, my LT1 sat roughly between 240–250 watts. At those powers, my lactate was approximately 1.0 mmol/L. My FTP at the time tested near 325–330 watts. Strong numbers on paper.
But riding at tempo or threshold had a noticeable cost. The sensations familiar to many riders — growing strain, early lactate accumulation, the feeling of being “on the limit” — showed up quicker than I liked. The power was there, but it came with volatility.
After a period focused specifically on raising LT1 and improving clearance — evidence-based, patient work — my physiology looked very different:
- Lactate at ~297W: 3.3 mmol
- Lactate at ~330W: 5.2 mmol
- LT1 near 280W
My FTP at that point was around 312–316W — slightly lower than before.
What improved was not the top number, but everything underneath it.
At powers that used to feel tense and fragile, my physiology now sat quietly in control. Threshold no longer cornered me; it became something I could occupy without fear of collapse. Where I once rode “over” my aerobic base, I now rode inside it.
Nationals: the clearest proof
The clearest demonstration of this came at Nationals in the road race, where I finished third on a hilly course filled with repeated surges and decisive climbing. A result sheet tells little of the journey inside a race. But I remember the sensations with unusual clarity.
From the first climb onward, I felt calm. Surges into the 400–500 watt range did not leave me flooded with lactate or gasping to recover. I could allow the effort to rise, absorb it, settle, and resume strong steady-state power. Each time the race surged, I managed to return to roughly 300–315W without a sense of panic or diminishing strength.
It is one thing to do this in training intervals. It is another to feel it late in a national championship, after hours of riding over threshold spikes and long climbs. In the final part of the race, I was still able to express power close to my threshold. Not once did I feel the hollow sensation that used to signal the ceiling of my FTP expression.
Other riders — some with bigger FTP values — began to sag: posture, cadence, breathing. The cracks were visible long before the selections were. My own race wasn’t without hard moments, but physiologically, there was no unraveling. I was simply present. Strong. Efficient. I controlled the race more than I reacted to it.
I didn’t win — racing is shaped by position, timing, luck, and countless details that do not always reward the strongest rider. But internally, that was one of the most complete races I’ve ever ridden. Not because I was the most powerful on paper. But because I remained the most intact when it mattered.
That is the difference between FTP as a number, and FTP as a thing the body can still reach when everything is stacked against it.
Why LT1 matters so much more than cyclists think
LT1 — the point where lactate begins to rise from baseline — is the strongest indicator of how expensive sustained efforts are. When LT1 is low relative to FTP, aerobic capacity is shallow and threshold power exists with high metabolic cost.
A high LT1 changes the equation completely. When LT1 gets close to threshold, threshold becomes cheap. Time at tempo or even at FTP demands less conversion of glycogen to lactate, allowing clearance and oxidation to match the stress. The body stays organized. Surges become survivable. Race power can be reached repeatedly without cracking.
It is not that FTP loses importance. It is simply no longer the axis on which everything turns.
The training that changed the engine
The transformation came from a block dedicated specifically to raising LT1 and reducing the lactate cost of riding in the tempo and threshold range. This meant:
- riding most endurance sessions at a physiologically accurate Z2 (for me, 240–265W),
- regular work at or just below threshold,
- occasional higher-lactate efforts to stimulate clearance,
- and consistent, well-timed carbohydrate fueling to support the adaptations.
I wasn’t trying to express a higher threshold. I was trying to make threshold metabolically affordable. There is a profound difference.
Over time, the sensations on the bike changed. The nervous edge of threshold dulled. Power that once lived just above LT1 migrated down into it. What used to feel maximal became comfortably aerobic. I could stay near threshold without sliding toward the point of no return.
In the process, FTP didn’t need to be higher to make me a stronger rider. In many ways, it was better that it wasn’t. The body reorganized around sustained efficiency, not maximal expression.
A simple test to expose the difference
If you want to know whether your FTP reflects what you can do under fatigue — instead of what you can do when perfectly fresh — there is a simple test that reveals reality quickly:
- Accumulate about 2,000–2,500 kJ of work on the bike.
Steady riding is fine. Flatter or rolling terrain works well. - After that accumulated work, ride 20 minutes at roughly 90% of your FTP.
If threshold is truly anchored in your physiology:
- the power will hold,
- heart rate won’t spiral,
- and the effort will feel sustainable.
If FTP only exists in ideal testing conditions:
- power will erode quickly,
- breathing will feel panicked,
- and the effort will slide out of reach long before 20 minutes is over.
It’s a blunt assessment, but a revealing one.
Most riders never ask themselves whether their FTP is functional under fatigue. They simply assume it is.
The test clarifies it immediately.
Quiet conclusions
I still care about FTP. It is a useful benchmark. But it is not the signpost of performance most riders believe it to be.
If your FTP is a number you can only express fresh — once, early in the ride, under perfect pacing — it is not a reflection of endurance. It is simply your best test result. Cycling is rarely won or lost in that environment.
What matters deeply is the structure that supports threshold:
where LT1 sits, how rapidly you clear lactate, and what power you can still express after fatigue has built its weight into your body.
At Nationals, I didn’t have the highest FTP in the race. But the physiology underneath it let me hold power in places where others were unraveling. It let me surge, recover, and still climb hard when it mattered.
I didn’t cross the line first. But I was the strongest I’ve ever been.
FTP didn’t explain that.
My metabolic system did.
And if you want to understand your own physiology in the same way — not just the number you can post online, but the engine that makes you fast when riding is hardest — that’s the direction I’ll keep writing toward.
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