Why Women Lose Muscle During Perimenopause
Perimenopause can feel confusing for many women. You may feel like you’re exercising the same way you always have, eating relatively well, and yet your body suddenly feels different. Strength decreases, recovery slows, energy drops, and it can become harder to maintain muscle tone.
One of the biggest changes women experience during perimenopause is the gradual loss of muscle mass.
This is incredibly common and not something you are imagining.
The good news is that strength training, nutrition, recovery and lifestyle changes can make a huge difference.
Why does muscle loss happen during perimenopause?
As women move through their 40s and into menopause, hormone levels begin to fluctuate and gradually decline, particularly oestrogen.
Oestrogen plays a much bigger role in the body than most people realise. Alongside reproductive health, it also helps support:
• muscle maintenance
• recovery from exercise
• bone density
• energy levels
• sleep
• metabolism
• insulin sensitivity
As oestrogen declines, the body becomes less efficient at maintaining lean muscle tissue. This means women can begin losing muscle more easily, especially if they are not doing regular strength-based exercise.
At the same time, many women are also juggling high stress levels, poor sleep, busy careers, children, ageing parents, and less time for themselves — all of which can impact recovery and overall health.
Why muscle matters more after 40
Many women focus heavily on weight loss or cardio during this stage of life, but muscle becomes one of the most important things to protect as we age.
Maintaining muscle helps support:
• strength and mobility
• healthy metabolism
• bone health
• posture and joint support
• energy levels
• balance and stability
• long-term independence and healthy ageing
Strength training is not about becoming bulky. For most women, it is about feeling capable, energised and resilient.
Signs you may be losing muscle
Some common signs include:
• feeling weaker during everyday tasks
• finding it harder to lift weights you previously could
• increased body fat around the middle
• lower energy levels
• slower recovery after exercise
• feeling less toned despite exercising
• more aches and pains
• reduced balance and stability
These changes can happen gradually, which is why many women feel frustrated or confused by them.
The mistake many women make
A lot of women respond to these changes by doing more cardio, eating less, or trying to “burn fat” through intense exercise.
Unfortunately, this can sometimes make the problem worse.
Excessive cardio combined with undereating can increase stress on the body and contribute further to muscle loss, fatigue and hormonal disruption.
For many women in perimenopause, the focus needs to shift towards:
• strength training
• adequate protein
• recovery
• sleep
• stress management
• sustainable movement
How strength training helps
Strength training is one of the most effective ways to help preserve and build muscle during perimenopause.
This could include:
• resistance machines
• dumbbells
• kettlebells
• bodyweight exercises
• resistance bands
• boxing-based conditioning
• functional strength work
The goal is not punishment. It is building a stronger, more resilient body that supports you long term.
Many women are surprised how much stronger, more confident and more energised they feel once they begin training properly for this phase of life.
Nutrition matters too
Protein becomes increasingly important during perimenopause as the body becomes less responsive to muscle-building signals.
Many women simply are not eating enough protein to support muscle maintenance and recovery.
Balanced nutrition alongside strength training can help support:
• muscle retention
• energy
• blood sugar stability
• recovery
• appetite regulation
Crash dieting and constantly restricting food often backfires during this stage of life.
Final thoughts
Perimenopause is not the end of feeling strong, fit or confident in your body.
In many ways, it can be the beginning of training smarter rather than simply harder.
With the right approach, women can build strength, improve energy, protect long-term health and feel far better physically and mentally through this transition.
If you are looking for support with strength training, fitness or wellbeing during perimenopause, I offer personal training in Crouch End and online coaching for women wanting a more sustainable and realistic approach to health and fitness.