Strength & ConditioningAnswer

WHY AM I LOSING MUSCLE AS A MASTERS CYCLIST?

By Anthony WalshRoadman CyclingUpdated 26 May 2026

ANSWER

Masters cyclists lose roughly 8% of muscle mass per decade — more if they only ride and never lift. Cycling is a low-force repetitive motion that barely recruits fast-twitch muscle fibres. After 40, those fibres decline specifically without the mechanical load stimulus of resistance training. Add to this that older muscle has anabolic resistance (needs more protein and a stronger signal to rebuild), and muscle loss becomes near-inevitable without two structured strength sessions a week.

KEY TAKEAWAYS

Muscle mass declines ~8% per decade after 40 without resistance work — sarcopenia is the clinical term.
Cycling barely recruits fast-twitch fibres, so it doesn't arrest the decline in the muscle that generates power.
Anabolic resistance in older muscle means lower protein sensitivity — you need more protein to get the same rebuilding signal.
Two structured strength sessions per week with meaningful load directly address both problems.

WHO THIS IS FOR

IS THIS YOU?

The masters cyclist noticing declining power

You've kept riding consistently but strength and snap are fading year on year.

The cyclist over 50 who has never lifted weights

You've been cycling-only and want to understand the risk of continuing without strength work.

THE ROADMAN VIEW

Sarcopenia — the age-related loss of muscle mass — is one of the most well-documented processes in exercise physiology. What's less discussed is how poorly cycling addresses it. Andy Galpin made this point clearly on the podcast: cycling is long, repetitive, and low-force for the fast-twitch fibres. Your slow-twitch endurance fibres get plenty of stimulus. The type-II fibres responsible for power and acceleration get almost none.

The result is a hidden erosion. Power output and muscular snap decline faster than aerobic fitness, so riders assume their engine is still fine. But over years, the fast-twitch depletion compounds. A rider who felt strong at 42 notices at 52 that they can't respond to attacks, can't sprint, and climbing snap has gone. That's not aging — it's sarcopenia in progress.

The fix is mechanical load. Two sessions a week of compound resistance work — split squats, hip hinges, single-leg deadlifts, press — with real weight and progressive overload. That stimulus is what fast-twitch fibres respond to. Add adequate protein to supply the building blocks and you're defending the tissue that cycling alone is letting disappear.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Andy GalpinProfessor of Kinesiology, Cal State Fullerton; muscle physiologist
Sarcopenia specifically targets fast-twitch type-II muscle fibres, and endurance exercise provides almost no counter-stimulus for those fibres. The only effective intervention is progressive mechanical load — structured resistance training with weights that are challenging, not merely inconvenient.
Hear it: The Science Of Getting Faster After 40 | Dr Andy Galpin
New masters strength researchRoadman podcast — what winning masters cyclists know
Recent controlled research confirms that structured heavy strength training outperforms additional cycling volume for muscle retention, power preservation, and bone density in masters athletes. Two sessions per week produce meaningful differences in muscle quality within 8–12 weeks.
Hear it: Heavy Strength Training for Cyclists Over 40 | Roadman Cycling

PRACTICAL APPLICATION

DO THIS WEEK

Add two strength sessions this week — not next month
Split squats, hip hinges, press, core. 3 sets of 6–10 reps at meaningful load. Start conservative on weight, prioritise form, and progress each week. Two 40-minute sessions beats one long one.
Increase protein to 1.6–2.2 g/kg/day
Older muscle needs more protein input to produce the same rebuilding response. 40–50g per meal across 4–5 sittings is more effective than the same total concentrated in two meals. The post-ride window especially matters.
Include sprint intervals to stress fast-twitch fibres on the bike
8–10 second maximum sprint efforts with full recovery stress fast-twitch fibres in a cycling-specific way. Two to four sprints within a Zone 2 ride once a week provides an additional fast-twitch stimulus on top of strength sessions.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKEBelieving that cycling prevents muscle loss.
FIXCycling addresses slow-twitch endurance fibres. The fast-twitch fibres that generate power and respond to strength training get essentially no stimulus from cycling. You must lift.
MISTAKEEating protein at 1.0–1.2 g/kg and wondering why muscle still goes.
FIXThat's the minimum for general health. Masters cyclists in training need 1.6–2.2 g/kg to overcome anabolic resistance and maintain muscle under training load.
MISTAKEUsing light resistance work (bands, body weight) as the strength stimulus.
FIXFast-twitch fibres respond to load, not reps. Band circuits and body-pump classes don't provide the mechanical stimulus needed to defend against sarcopenia. Use real weight.

FAQ

FREQUENTLY ASKED QUESTIONS

What is sarcopenia and does it affect cyclists?

Sarcopenia is the age-related decline in muscle mass and strength, progressing at roughly 8% per decade after 40. It affects cyclists disproportionately in fast-twitch fibres because cycling provides almost no stimulus to retain them.

Can you build muscle after 50 as a cyclist?

Yes — from a baseline of no resistance training, most masters cyclists who start lifting see meaningful strength gains within 6–8 weeks. Building significant mass is harder after 50, but maintaining and modestly increasing it is achievable with consistent training and adequate protein.

Will strength training affect my endurance?

Not negatively, at two sessions a week. The evidence consistently shows that masters cyclists who add structured strength work see FTP stabilise or improve, not decline. The volume is too low to compromise aerobic capacity.

How do I know if I'm losing muscle as a cyclist?

Declining sprint power and reduced ability to respond to accelerations are early signs. A DEXA scan gives a precise body composition snapshot including lean mass. Tracking over years reveals whether muscle is being lost or held.

Does weight loss cause muscle loss in masters cyclists?

It can, especially during calorie-restricted weight loss without adequate protein and resistance training. To lose fat while protecting muscle after 50, you need to maintain strength sessions and hit 1.6–2.2 g/kg of protein per day.

How long does it take to stop losing muscle with strength training?

Within 4–6 weeks of consistent resistance training, neuromuscular adaptations begin. Genuine muscle preservation effects accumulate over 3–6 months. The earlier you start, the more there is to preserve — don't wait until the decline is severe.

RELATED EPISODES

HEAR THE CONVERSATIONS

The Science Of Getting Faster After 40 | Dr Andy Galpin

Heavy Strength Training for Cyclists Over 40 | Roadman Cycling

Is Strength Training Essential For Cycling? | Rdmn Podcast Clips