How Does Swimming Maintain Musculoskeletal Function in Low Bone Density? What Clinical Studies Show, and How Does This Compare with Cycling? 🏊🦴🚴
This article is written by mr.hotsia, a long term traveler and storyteller with a YouTube channel followed by over a million followers. Through years of travel across Thailand, Laos, Vietnam, Cambodia, Myanmar, India and many other Asian countries, I have seen that people with low bone density often face a frustrating exercise puzzle. They want to stay active, protect their joints, avoid falls, and keep their muscles working well, but they also hear again and again that the “best” bone exercises are weight-bearing and impact-based. That makes many people wonder where swimming and cycling fit in. In this article, I want to explain how swimming may help maintain musculoskeletal function in people with low bone density, what clinical studies actually show, and how this compares with cycling in a practical and realistic way.
Introduction
The first thing to understand is that maintaining musculoskeletal function is not the same as directly increasing bone mineral density. A person with osteopenia or osteoporosis needs both, but they are not identical goals. Bone density is the scan result. Musculoskeletal function is the lived result: strength, mobility, flexibility, balance, gait, endurance, posture, and the ability to move safely through daily life. Swimming and cycling are often weak tools for directly loading bone because they are non-weight-bearing, but they can still be useful for maintaining function, fitness, and movement confidence.
That distinction matters a lot. Mayo Clinic, the International Osteoporosis Foundation, and the NHS all make essentially the same point: swimming and cycling have health benefits, but they do not provide the weight-bearing load bones need to slow bone loss as effectively as impact or resistance work. So if the question is “Will these activities build bone strongly on their own?” the answer is usually no. But if the question is “Can these activities help a person with low bone density stay stronger, steadier, and more functional?” the answer is often yes, especially when they are part of a broader exercise plan.
Why Swimming Can Still Matter in Low Bone Density
Swimming is often underestimated because it happens in a non-weight-bearing environment. Water unloads the joints and the skeleton, which means it does not give bone the same mechanical signal as walking, jumping, or resistance training. That is exactly why swimming is not usually recommended as the main exercise for improving bone density. At the same time, the water provides resistance in all directions, and buoyancy reduces pain, fear, and impact stress. This makes swimming and aquatic exercise attractive for people who are deconditioned, painful, or afraid of land-based movement.
There is another practical detail that often gets blurred. The research base for aquatic exercise is stronger than the research base for pure lane swimming. Many studies involve water-based group exercise, water walking, water resistance drills, or structured aquatic classes rather than freestyle laps alone. So when we say “swimming may help maintain musculoskeletal function,” the strongest evidence often comes from aquatic exercise programs, not necessarily from lap swimming as a sport. That is an important nuance, because the pool can be used in very different ways.
What Clinical Studies Show About Swimming and Aquatic Exercise
A useful randomized controlled trial in women aged 65 and older with osteopenia or osteoporosis found that a 10-week water-based exercise and self-management program produced significant improvements in balance and several domains of quality of life, although it did not significantly improve fear of falling. This is an important result because balance is a major fracture-related issue in low bone density. A person who becomes steadier may reduce fall risk even if their DXA scan changes little.
Another randomized clinical trial compared aquatic exercise, land exercise, and non-exercise control in older women with osteoporosis. Its conclusion was more modest: there were no significant differences in balance, function, or quality of life between the aquatic and land groups compared with the non-exercise control group. That trial reminds us that aquatic exercise is not automatically superior just because it feels gentler or safer. It may be useful, but not every study shows large functional advantages.
The broader and more encouraging picture comes from newer pooled evidence in older adults. A 2025 systematic review and meta-analysis of 19 randomized controlled trials involving 866 healthy older adults found that aquatic exercise significantly improved lower-limb muscle strength, flexibility, and functional mobility, including better Timed Up and Go performance. The authors concluded that aquatic exercise may be a viable strategy for preserving muscle function and maintaining functional independence in older adults. Even though this review was not limited to low bone density populations, its findings matter greatly because the functional problems it targets are the same ones that make fractures more likely and recovery harder.
A 2023 systematic review and meta-analysis on aquatic exercise and bone health in older adults also concluded that exercise had a favorable effect on bone health overall and noted that water-based exercise may be especially useful for people unable, afraid, or unmotivated to perform intense land-based exercise. That does not mean aquatic training beats land loading for bone. It means it may serve as a practical bridge for people who otherwise would not exercise at all.
Does Swimming Improve Bone Density?
This is where the answer becomes more restrained. A 2020 systematic review and meta-analysis on swimming as a treatment for osteoporosis concluded that swimming may improve BMD in postmenopausal women when swimming time is between 3 and 6 hours per week, particularly in long-term swimmers. That sounds positive, but it has to be read alongside other reviews.
A 2016 review article came to the opposite broad conclusion, stating that swimming and cycling do not cause positive effects on BMD and therefore are not the most suitable exercises for the prevention and treatment of osteoporosis. An earlier systematic review similarly concluded that swimming does not seem to negatively affect bone mass, but it also does not appear to be one of the best sports for increasing it. So the fair summary is that swimming is not strongly osteogenic, and any direct BMD benefit is uncertain and probably modest at best.
That is why swimming should usually be seen as a function-preserving activity more than a primary bone-building activity. It may help a person move better, stay active longer, improve lower-limb and whole-body conditioning, and preserve confidence, but if the goal is specifically to increase bone density, swimming alone is usually not enough.
How Cycling Compares
Cycling shares one major problem with swimming in bone health: it is also non-weight-bearing. The skeleton is supported rather than loaded, so the osteogenic signal is weak. Major clinical and public-health guidance notes that cycling, like swimming, offers many general health benefits but does not provide the weight-bearing load bones need to slow bone loss effectively.
In fact, the bone-specific cycling literature is often more worrying than the swimming literature. A systematic review of cycling and bone health concluded that adult road cyclists often show low BMD in key skeletal regions such as the lumbar spine. Another review on bone health in cyclists reached a similar conclusion, reporting that road cycling may not be as beneficial to bone health as weight-bearing activities and that low lumbar BMD is not unusual in dedicated cyclists.
That does not mean cycling is bad in every way. Quite the opposite. The functional evidence for cycling in older adults is actually quite encouraging. A 2019 systematic review on indoor cycling reported benefits for aerobic capacity, blood pressure, lipid profile, and body composition. A 2025 randomized trial of short-term cycling interventions in older adults found improvements in cardiovascular health, cognitive function, aerobic fitness, muscle strength, and muscle volume. A 2026 systematic review of stationary bike interventions reported significant benefits in VO2 max, quality of life, and mobility, including Timed Up and Go performance. So cycling may be poor at loading bone, but it can still be strong for conditioning.
There is even some evidence that cycling can improve balance-related outcomes. Older pilot work suggested bicycling may function as a falls-prevention strategy in healthy older adults able to ride a bicycle, and a study on stationary bicycle exercise found it improved balance in elderly women. Still, this does not cancel out the low-loading problem. Cycling can improve the rider while leaving the skeleton under-stimulated.
Swimming Versus Cycling for Musculoskeletal Function
If we compare swimming and cycling specifically for maintaining musculoskeletal function in people with low bone density, the answer is not simply one beats the other. Each has a different profile.
Swimming and aquatic exercise often look better for whole-body movement, joint-friendly resistance, flexibility, and functional mobility, especially in people with pain, fear of falling, or reluctance to exercise on land. The water can reduce fear and help people move more freely, which may improve adherence. Aquatic exercise also appears to help lower-limb strength and Timed Up and Go performance in older adults.
Cycling often looks better for aerobic conditioning, leg endurance, muscle volume, and cardiovascular fitness. For someone who wants to maintain stamina and leg function with low joint impact, cycling can be excellent. But it generally challenges balance less than upright aquatic classes, contributes less to flexibility, and may reinforce a mainly seated, sagittal movement pattern rather than broader whole-body control.
So the practical comparison is this: swimming and aquatic exercise are often better for all-around low-impact movement quality, while cycling is often better for aerobic and lower-limb conditioning. Neither is a top-tier stand-alone strategy for increasing bone density. That is why guidelines consistently tell people with osteoporosis or osteopenia to add weight-bearing and resistance exercise as able.
What the Best Real-World Strategy Looks Like
For many people with low bone density, the best answer is not to argue over swimming versus cycling as if one must be the only option. The better strategy is to use these activities for what they do well.
Swimming or aquatic exercise can help maintain mobility, lower-limb strength, flexibility, and movement confidence, especially when pain, obesity, arthritis, or fear of impact make land exercise difficult. Cycling can help preserve cardiovascular fitness, leg strength, and endurance, especially when walking or impact work is limited by joint symptoms. But for skeletal loading, both need help. They should usually be paired with some form of resistance training and, when safe, weight-bearing activity such as walking, stair work, or higher-level impact tailored to fracture risk.
This is also the most honest message for patients. If someone loves swimming, it is better for them to keep swimming than to quit exercise because they cannot tolerate impact. If someone loves cycling, it is better for them to keep riding than to become sedentary. But neither person should assume that their preferred low-impact activity is doing all the bone work alone. Bones usually want a louder mechanical message.
Final Thoughts
So, how does swimming maintain musculoskeletal function in low bone density, what do clinical studies show, and how does this compare with cycling?
Swimming, especially in the form of structured aquatic exercise, can help maintain musculoskeletal function by improving balance, lower-limb muscle strength, flexibility, mobility, and quality of life. Clinical trials in older women with osteopenia or osteoporosis show that water-based programs can improve balance and quality of life, while broader meta-analytic evidence in older adults supports gains in lower-limb strength and functional mobility.
Compared with cycling, swimming and aquatic exercise may offer a broader whole-body functional benefit and may be especially useful for people with pain or fear of land-based movement. Cycling has strong benefits for aerobic fitness, muscle strength, endurance, and even some mobility-related outcomes, but its bone-specific record is weaker and in dedicated cyclists may even be unfavorable at key sites such as the lumbar spine.
The fairest bottom line is this: swimming may be slightly better for maintaining broad musculoskeletal function, while cycling may be slightly better for cardiovascular and leg-endurance conditioning. But for people with low bone density, neither should be treated as the main bone-building tool. The smartest plan is to use swimming or cycling to stay active and functional, then add weight-bearing and resistance work to give the skeleton the loading signal it truly needs.
FAQs
1. Can swimming help people with osteopenia or osteoporosis?
Yes. Swimming and especially structured aquatic exercise can help maintain mobility, lower-limb strength, balance, and quality of life, even though they are not the strongest exercises for increasing bone density.
2. Does swimming increase bone density?
Possibly a little in some studies, especially in long-term swimmers, but overall the evidence is mixed and swimming is not considered a strongly bone-building exercise.
3. Is aquatic exercise different from lap swimming?
Yes. Many clinical studies use aquatic exercise classes, water walking, or water resistance programs rather than lap swimming alone, and the evidence for function is stronger in that broader aquatic-exercise literature.
4. What did clinical trials show about aquatic exercise in older women with low bone density?
One randomized trial found improved balance and quality of life after a 10-week water-based program in women with osteopenia or osteoporosis, although fear of falling did not significantly improve.
5. How does cycling compare with swimming for bone density?
Both are non-weight-bearing and therefore weak for directly stimulating bone. Cycling may actually be associated with low BMD in dedicated adult road cyclists, especially at the lumbar spine.
6. Does cycling still help older adults?
Yes. Cycling interventions improve aerobic fitness, cardiovascular health, muscle strength, muscle volume, quality of life, and some mobility outcomes in older adults.
7. Which is better for overall musculoskeletal function, swimming or cycling?
Swimming and aquatic exercise may offer broader whole-body functional benefits such as flexibility, mobility, and balance, while cycling is especially strong for aerobic fitness and leg endurance.
8. Which is safer for painful joints?
Both are low-impact, but aquatic exercise often feels easier for painful joints because buoyancy unloads the body and reduces fear of movement.
9. Should people with low bone density do only swimming or cycling?
Usually no. Major guidance says swimming and cycling have benefits, but weight-bearing and resistance exercise are particularly important for protecting or improving bone density.
10. What is the simplest bottom line?
Swimming helps maintain movement quality and function, cycling helps maintain aerobic and leg function, but neither gives bones the weight-bearing signal they need as effectively as resistance and impact-based exercise.
I’m Mr.Hotsia, sharing 30 years of travel experiences with readers worldwide. This review is based on my personal journey and what I’ve learned along the way. Learn more |