There is a moment most cyclists over 40 will recognise. You are on a club ride. You are fit, fitter than you have been in years. The legs feel good for two hours, three hours, four. Then someone half your age sits up at the front, kicks, and is gone in six seconds.
You sit there at the same heart rate you had a minute ago and tell yourself it is age. It is not.
Andy Galpin is a professor of kinesiology at California State University, Fullerton, and one of the most cited muscle physiologists in the world. He has spent two decades studying what actually happens inside skeletal muscle as it adapts and as it ages. He sat down with me on the podcast this week to walk through what is really going on for the cyclist over 40 — and what the science says you do about it.
Here is the conversation, written up so you can use it on Sunday.
What Actually Goes First — And Why It Is Not What You Think
Most cyclists assume muscle mass is the first thing to fade after 40. The legs get smaller, the wattage drops, the tale ends. That is wrong on the order, and the order is the most important part of this whole conversation.
Andy's framing is a hierarchy. Power output declines faster than maximal strength. Strength declines faster than muscle mass. The neuromuscular system — the speed at which your nervous system can recruit and fire muscle fibres — is the most fragile thing in your engine, and it is the first thing to fade. Mass and strength can stay relatively intact for years while power has already started slipping.
That hierarchy is the explanation for the moment on the club ride. Your aerobic engine has been steadily trained for a decade. The fibres responsible for absorbing four hours of zone two are well looked after. The high-velocity end of the system, the bit that produces a six-second kick, has been quietly losing the ability to switch on quickly. Same legs. Same FTP. Different nervous system.
The cycling internet rarely talks about this in the right order. It talks about VO2max, about FTP, about watts per kilo. All useful, all incomplete. Power and the speed of force production sit underneath all of those numbers, and they are the metrics that age first.
The Fibre Story — Why Type Two Is The Whole Game
Skeletal muscle is not one thing. It is a mix of slow-twitch (type I) fibres, which are aerobic, fatigue-resistant, and the workhorses of long endurance work, and fast-twitch (type II) fibres, which are anaerobic, force-producing, and the engine room of sprints, surges, and any effort that needs power in a hurry.
The published work on ageing muscle is unambiguous. Type II fibres can be 10 to 40 percent smaller in older adults compared with younger controls. Type I fibres are relatively preserved. The atrophy is not even — it falls almost entirely on the fibres that drive power.
The implication for a 45-year-old amateur cyclist is uncomfortable. Five years of dedicated endurance training has been training the fibres that age well anyway. The fibres that are actively shrinking — the type II fibres responsible for the kick — have barely been touched. As Andy put it on the episode, "if all you do is endurance work, you are training the part of the system that is already going to be fine."
This is also why the loss is invisible until it shows up at the worst moment. Type II atrophy does not present as fatigue on a long ride. The endurance feels intact because the endurance fibres are intact. It presents as a missing six-second kick, a slow response to an attack, a climb where you used to be able to surge over the top and now you cannot. The system has been deteriorating for years and the rider only meets the consequence in a sprint or a punch.
The Velocity Argument — Why Heavy And Slow Is Half The Story
The cycling world is finally talking about strength training, which is good. The problem is the conversation has anchored almost entirely on heavy slow lifting. That misses the most important variable for an older athlete.
Andy's research, and the wider literature on power training in masters athletes, is consistent on one point: velocity matters as much as load. The nervous system adaptation that protects type II fibres is driven by how fast you ask the muscle to produce force, not just how much. A moderate weight moved quickly does more for the neural drive of a 47-year-old than a heavier weight moved slowly.
This does not mean don't load. It means load with the speed of the movement in mind. A leg press done explosively, with a controlled eccentric and a deliberate concentric drive, recruits and trains type II fibres in a way that a grinding heavy slow rep simply does not. Plyometric variations — graded for the body in front of you — train the same system. So do short, sharp, full-effort sprints on the bike.
A useful sanity check Andy gives. Speed is a skill. Stop practising the skill and the skill goes. If the last time you genuinely tried to move something fast was in your thirties, the issue is not that the fast-twitch fibres are gone. The issue is that the nervous system has stopped knowing how to use them.
What This Looks Like For A Roadman Rider
Inside the Not Done Yet community we have been refining the masters strength block for two years now and the picture lines up almost exactly with what Andy describes. The work that produces the biggest jump in the data is rarely the heaviest. It is the targeted, sport-specific work that demands rapid force production with the kind of patterns a cyclist actually uses.
Three pieces of work hold most of the weight.
Targeted resistance work, twice a week, 30 to 40 minutes. Single-leg patterns are the anchor — split squats, single-leg presses, step-ups, single-leg Romanian deadlifts. They demand more neural drive than bilateral lifts, they correct the side-to-side asymmetries every cyclist develops, and they protect the joints and tendons that have to absorb a few hundred thousand pedal strokes a week. Eccentric control matters: the lowering phase is where the type II fibres are most exposed and most adaptable. Done with intent, two sessions a week is enough to drive meaningful change inside eight weeks.
Velocity work, in the gym and on the bike. Inside the session, a portion of the work should be moderate load moved fast — explosive concentric drive, full intent, complete recovery between sets. On the bike, this shows up as short neuromuscular efforts: ten-second standing accelerations from low cadence, six-second sprints from rolling, ten-by-ten-second efforts on a flat road with full recovery in between. Tiny in volume. Disproportionate in effect. These are the sessions that train the nervous system to switch the high end on, fast. Skipped almost universally by amateur masters cyclists, because they don't feel "hard" in the conventional sense.
Sport-specific strength. This is the layer most riders get wrong. The objective is not to build a powerlifter inside a cyclist. It is to make the patterns and joint angles a cyclist uses more durable and more powerful. That means hip-hinge work, single-leg pressing patterns, calf and ankle work, and the kind of trunk work that lets you put down power in the drops without losing the front of the bike. Done well, the strength session ends and the bike feels stiffer, sharper, more responsive — not slower the next day.
This is also why the Roadman strength training guide and the training plan for cyclists over 40 lean toward targeted, sport-specific resistance rather than a generic powerlifter template. Two different problems. Two different prescriptions.
Protein Most Cyclists Are Still Underdoing
The other half of the conversation is what happens off the bike. Andy has been writing about masters protein dosing for years, and the picture has not moved.
Daily intake should sit between 1.6 and 2.2 grams per kilogram of body weight for trained athletes over 40. For a 75 kilogram cyclist, that is 120 to 165 grams a day. The distribution matters as much as the total. Four meals a day, each carrying 25 to 35 grams of real protein, with at least one dose at the top end of that range to clear the leucine threshold that older muscle needs to flip muscle protein synthesis on.
Most serious amateur cyclists are eating closer to 1.0 to 1.2 grams per kilogram, with most of it at dinner. That looks fine on a daily total in a tracking app and is functionally inadequate for muscle protein synthesis at this age. The result is a rider who lifts hard, rides hard, and never quite gets the adaptation the work earned.
A practical fix that takes one week to install. Build a protein-anchored breakfast you actually like (eggs, Greek yoghurt, kefir, cottage cheese, smoked fish — pick two). Make lunch a protein-first plate with a real portion. Eat the post-ride window deliberately. Have the highest-protein meal of the day be dinner anyway, but not the only one. Detail in the cycling protein requirements guide.
Recovery Is The Multiplier
Every adaptation in this article is gated by what happens after the work. Andy is unequivocal on this — "recovery is not the absence of training. It is the active process that turns training into adaptation." Cut sleep, stack stress, under-eat protein, and you are running a body that cannot bank what you are spending.
The signal a masters rider should watch is recovery quality, not training volume. The Masters Recovery Score was built to give a weekly read on this — sleep, training load, life stress, and the gap between hard sessions, scored together so you can see whether the next hard day is going to compound your training or just compound your fatigue.
How To Test Whether You Have Lost The High End
Two quick reads, both honest.
First, run your numbers through the Masters FTP Benchmark and look at where your six-second and one-minute power sit relative to your FTP. If your FTP is well-developed and your six-second power is below the band the tool flags for your age and weight, you have lost the high end. That is not a guess. That is the gap.
Second, the simplest field test in the world. Roll along at endurance pace for 90 minutes. At minute 91, stand up, drop into a low gear, and try to put down a full ten-second standing acceleration on the flat. If the legs feel slow, hesitant, "thick," and the watts climb gradually rather than spiking, the type II side of the system has been undertrained. Repeat once a week through a build. If the spike sharpens and the watts come up faster, the work is doing what it should.
Key Takeaways
- The order of decline after 40 is power, then strength, then mass — the nervous system ages first, which is why the kick fades before the engine.
- Type II fibres can shrink 10 to 40 percent in older adults and are barely trained by endurance riding alone.
- Velocity is the variable most masters cyclists ignore. Moderate weights moved fast do more for the nervous system than heavy weights moved slowly.
- Targeted resistance work — single-leg patterns, controlled eccentrics, sport-specific strength — twice a week is enough to drive meaningful change inside eight weeks.
- Short neuromuscular efforts on the bike — ten-second standing accelerations, six-second sprints — protect the high end of the power curve. Skipped almost universally. Disproportionately useful.
- Protein at 1.6 to 2.2 grams per kilogram, spread across four meals, with at least one dose above 35 grams. Most amateurs eat half that.
- Recovery, sleep, and stress regulation are the multiplier on every adaptation in this article. Cut them and the work does not bank.
- Run your numbers through the Masters FTP Benchmark and the Masters Recovery Score for an honest read on whether the high end has gone yet and whether you are recovering well enough to bring it back.
- Listen to the full Andy Galpin conversation on the podcast for the long-form version of all of this.
- Strength is one of the five pillars inside NDY coaching at Roadman — if you want someone to build the targeted resistance, velocity, and recovery structure around you rather than guessing at it, that is where it lives. Standard membership is $195/mo. The application is the start of the conversation.
- Got a specific question — what to do in the gym, how to layer the velocity work into a race week, what protein looks like on a Tuesday? Ask Roadman — it pulls answers from the actual conversations we have had with Andy and the rest of the strength and physiology guests.
