Why your muscles change during perimenopause and menopause
You may have noticed that your body feels different than it did ten years ago. Things that once felt easy require more effort. You tire more quickly. Your strength feels less reliable than it used to. There is a name for what is happening, and it is called sarcopenia.
Sarcopenia is the gradual loss of muscle mass and strength that comes with age. Most women have never heard the word. Most are also not told that it begins earlier than they expect, or that perimenopause and menopause accelerate the process significantly.
When does it start?
Muscle loss begins gradually from around your mid thirties, long before most women are told anything about it. During perimenopause and menopause, as estrogen falls, that process speeds up. After menopause, without regular exercise, women lose around 0.6% of muscle mass per year.
Staying active makes a real difference to how that plays out.
Why it matters
Muscle does more than move you. It supports your joints, helps regulate your metabolism, contributes to your balance and coordination, and plays a role in how your body manages blood sugar. Keeping your muscle mass strong during perimenopause and menopause supports all of those things.
You might already recognise it. Groceries that feel heavier than they used to. Stairs that take more out of you. It is more common than most women realise.
Most women are surprised by how much muscle has to do with how they feel day to day.
What helps
Moving your body regularly is the most effective thing you can do. Muscle responds to being used at any age and any stage of life.
It does not have to look a particular way. Walking on hills, carrying shopping, bodyweight exercises at home, resistance bands, weights, yoga. Whatever you can fit in and sustain.
Protein is also part of the picture. Your muscles need it to repair and rebuild, and many women find their appetite shifts during perimenopause and menopause in ways that affect how much they are eating without realising it.
What to do next
Most women are never told about sarcopenia. The earlier you start paying attention to your muscle health, the more difference it makes.
For more on how estrogen loss affects your body more broadly, see our article on what estrogen loss actually does to your body. For guidance on exercise during perimenopause and menopause, see our exercise and bone health article.
References
Juppi, H., Sipila, S., Cronin, N., et al. (2020). Role of menopausal transition and physical activity in loss of lean and muscle mass: a follow-up study in middle-aged Finnish women. Journal of Clinical Medicine, 9. https://doi.org/10.3390/jcm9051588
Nedergaard, A., Henriksen, K., Karsdal, M., & Christiansen, C. (2013). Menopause, estrogens and frailty. Gynecological Endocrinology, 29, 418-423. https://doi.org/10.3109/09513590.2012.754879
Wright, V.J., Schwartzman, J.D., Itinoche, R., & Wittstein, J. (2024). The musculoskeletal syndrome of menopause. Climacteric, 27(5), 466-472. https://doi.org/10.1080/13697137.2024.2380363
Isenmann, E., Geisler, S., Havers, T., Siegert, F., Hemke, F., & Held, S. (2026). It’s never too late: The impact of resistance training on strength and body composition in females across the lifespan. Journal of Science and Medicine in Sport. https://doi.org/10.1016/j.jsams.2026.03.002
WHEN Position Statement: Resistance Training Across the Menopausal Transition (April 2026). Women’s Health Education Network. www.when.org.au
Developed by the WHEN Clinical Team
Clinically reviewed by the WHEN Clinical Governance Committee
Last reviewed: July 2026
