Female athletes over 40: the warning system you lose

Masters brackets in jiu-jitsu, boxing and judo are full of women in their forties and fifties. What is written for them is either advice for younger athletes with the word "masters" attached, or general health material for women who do not train. Neither is much use if you are still competing.

What perimenopause actually is

The transition before periods stop altogether. It commonly begins somewhere in the forties, sometimes earlier, and can run for several years.

Cycles become irregular in length and in flow, and hormone levels fluctuate rather than declining smoothly.

That last word matters. The decline is variable rather than a steady slope you can plan around, and one month tells you little about the next.

The signal you are about to lose

Everything on this site about female athletes rests on one idea: the menstrual cycle is a measurement. When energy availability drops too far, the cycle changes before performance does, before body composition does, and long before anything shows on a scan.

That is the argument in REDs in combat sports.

In perimenopause that signal degrades. A missed or irregular period could be low energy availability, or it could be the transition, and from the outside they look the same.

Telling them apart is a clinical job rather than a coaching one, and worth naming for a specific reason: a woman over 40 presenting with irregular cycles, fatigue and low mood is very likely to be told it is perimenopause, because it usually is. Underfuelling produces the same picture and gets missed. If you are training hard and competing, say so at the appointment, because it changes what the doctor is looking for.

Bone, which is the real risk

Oestrogen protects bone. As it declines through the transition, bone loss accelerates, and it does so in a population that may already have a history of repeated weight cycling and periods of low energy availability.

Those two things compound rather than adding. The case for why bone is decided years before anything shows is in bone, and everything in it applies more, not less, from here.

Practically: calcium and vitamin D intake matter and are worth checking rather than assuming, loading through training is protective and is one of the arguments for continuing to compete rather than stopping, and a DXA scan is a conversation to have with a doctor rather than a thing to arrange after something breaks.

Iron goes the other way from what people expect

The assumption is that iron stops being a concern as periods become less frequent. Often the opposite happens first.

Heavier and less predictable bleeding is common during the transition, and heavy menstrual loss is one of the main routes to iron deficiency in female athletes.

So the risk can rise during precisely the years when people stop watching for it.

It is assessed with a blood test rather than guessed at, and the reasons it hides as bad training are in iron.

Body composition, and the division

Lean mass declines with age unless it is defended, and the transition tends to shift where body fat sits. The consequence for a competitor is that the same weight class becomes a different job: the number on the scale is reached with a different body than it was 10 years earlier.

Which makes this the age to ask the question honestly rather than to keep the answer you had at 30. Masters divisions use the same limits as the adult categories, so the rules ask a 45-year-old for the same number with less capacity to recover from reaching it. The arithmetic is in which division you belong in, and if the answer is the class above, moving up usually costs nothing at all.

Protein and training: less changes than you have been told

The claim that older athletes need dramatically more protein comes from research on older adults who do not train, and the anabolic resistance it describes is driven largely by inactivity rather than by age.

For a woman training 4 times a week, the daily target sits in the same range as any competing athlete’s.

What shifts is the size of each sitting rather than the total. Some practitioners argue for a slightly higher amount per meal in women through and after the transition, on the reasoning that falling oestrogen contributes something of its own, and the practical difference is small enough that four solid sittings covers either position.

The general case is on competing over 35, which applies to female athletes as much as to male ones.

Resistance training does two jobs here at once: it defends lean mass and it loads bone. It is the least optional part of a plan at this age.

Hormone therapy, and the question to actually ask

Some athletes go through this transition on hormone therapy prescribed by a doctor. That is a medical decision and it is not one I make or comment on.

What does belong here is the sporting question, and it needs asking in advance rather than afterwards. Any prescribed treatment should be checked against the current WADA Prohibited List by whoever prescribes it, together with you, before it is started. Where a prohibited substance is genuinely needed, the route is a therapeutic use exemption applied for ahead of time, and the process is in TUE: how to apply.

Two things worth knowing while you have that conversation. Most doctors will not think to ask whether you compete in a tested sport, and it is not their job to know the List. And the same caution applies to anything else in the cabinet at this age, which is the point made in competing over 35 about blood pressure medication.

What I would put on a schedule

• Blood work at intervals agreed with a doctor, including iron status. Not once, on a schedule.
• A conversation about bone density, initiated by you.
• Resistance training treated as non-negotiable rather than as supplementary.
• Protein at the usual target, taken across four sittings rather than two.
• Every prescribed medication checked against the Prohibited List before it starts.
• The division reviewed honestly each season rather than inherited from your twenties.

Why this page exists at all

Because the research is thin and the advice is thinner. Most of what is known about female athletes was measured on women in their twenties, and most of what is known about this transition was measured on women who do not train.

The overlap is small and it is where you are standing.

The honest position is that some of this is extrapolation, and I would rather say so than pretend otherwise. What is not extrapolation: the signal you have relied on gets less reliable, the bone risk rises, and the answer is to start measuring things you previously did not have to.