Is Swimming Good for Perimenopause Bone Density?
Swimming has real benefits during perimenopause, but bone density is its weak spot. Learn what swimming can and can't do, and what to add alongside it.
Bone Loss During Perimenopause: What's Actually Happening
Bone density starts declining in the years before your final period. Falling oestrogen is the main driver. Oestrogen helps your bones hold on to minerals, particularly calcium, and as levels drop the balance between bone building and bone breakdown shifts in the wrong direction. Women can lose up to 10 percent of their bone mass in the first five years after menopause, and the process often begins during perimenopause itself. This makes protecting bone density a real priority during this decade, not something to think about later.
Why Swimming Alone Is Not Enough for Bones
Swimming is a wonderful form of exercise, but it has one well-documented limitation for bone health: it is non-weight-bearing. Bone responds to mechanical load. When you walk, run, or lift a weight, ground reaction forces travel through your skeleton and stimulate bone-building cells called osteoblasts. In water, buoyancy removes most of that load. Your joints are protected, your heart and lungs are working hard, your muscles are active, but your bones are not receiving the stress signal they need to build or maintain density. Studies comparing swimmers to runners and weightlifters consistently find that swimmers have similar or lower bone density than non-exercising controls in some sites, particularly the hip and spine. This is not a reason to avoid swimming. It is a reason to understand what swimming does and does not deliver.
What Swimming Does Offer During Perimenopause
Even if swimming does not directly stimulate bone formation, it provides benefits that matter for long-term bone health indirectly. Swimming builds lean muscle mass, particularly in the upper body, shoulders, and core. Muscle strength matters because stronger muscles mean better balance and coordination, which reduces fall risk. Falls cause fractures. Preventing falls is therefore a key part of protecting your bones. Swimming also improves cardiovascular fitness and supports a healthy weight, reducing the load placed on already vulnerable joints. It is low impact, making it accessible to women who already have joint pain or who find high-impact exercise aggravating. If swimming is what keeps you moving consistently during perimenopause, that sustained activity is valuable.
What to Combine with Swimming for Bone Density
To address bone density directly, add weight-bearing and resistance exercise to your routine alongside swimming. You do not need to choose one or the other. A practical approach is to swim two or three times per week for cardiovascular health and joint comfort, then add two sessions per week of weight-bearing activity. This could be walking, jogging, dancing, tennis, or hiking, all of which involve impact that travels through the spine and hips. Resistance training using weights, resistance bands, or bodyweight exercises like squats and lunges is also highly effective. Resistance training has been shown in multiple studies to slow bone loss and in some cases modestly improve density, particularly at the hip and spine. Even 20 to 30 minutes twice a week makes a measurable difference over time.
Nutrition and Bone Health: The Other Side of the Equation
Exercise alone does not fully protect bone density without adequate nutrition. Calcium and vitamin D are the two most important nutrients. Women over 40 need around 1,000 to 1,200 milligrams of calcium daily from food or supplements. Dairy products, fortified plant milks, leafy greens, canned fish with bones, and tofu made with calcium sulphate are good sources. Vitamin D is needed for calcium absorption and most people in northern climates are deficient during winter months. A supplement of 1,000 to 2,000 IU daily is commonly recommended, though testing your level and adjusting accordingly is ideal. Magnesium, vitamin K2, and protein also play supporting roles in bone metabolism. A diet rich in vegetables, quality protein, and whole foods provides a strong foundation.
Should You Ask for a Bone Density Scan?
If you are in your mid-40s or older and perimenopause is underway, it is worth having a conversation with your GP about bone density testing. A DEXA scan is the gold standard for measuring bone mineral density and is non-invasive and quick. Risk factors that make early testing more relevant include a family history of osteoporosis, a history of eating disorders, having had your ovaries removed, using corticosteroids long term, or being a current or former heavy smoker. Knowing your baseline gives you concrete information to work with rather than guessing. If your bone density is already reduced, your GP can discuss options including HRT, which has strong evidence for protecting and in some cases improving bone density during the menopause transition.
Building a Routine That Covers All the Bases
Swimming fits beautifully into a perimenopause fitness routine when it is not used as the only form of exercise. Think of it as the cardiovascular and recovery pillar, the activity that is kind to your joints and excellent for your heart, mood, and sleep. Layer in walking or jogging for the impact your bones need, and resistance training for the strength your muscles and skeleton both require. This combination addresses perimenopause from multiple angles at once, protecting bone while also supporting metabolism, mental health, and energy levels. Three to four active sessions per week is a realistic and evidence-backed target. Start where you are and build gradually.
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