People frequently ask me if swimming or other water exercise can help build or maintain bone density. Iâve always thought (and so have other researchers) that water exercise wouldnât be the best possible exercise for bone â after all, swimming is low-impact, and the water supports your body weight. I could see how the full-body muscle movement in water exercise might reduce the âuse-it-or-lose-itâ peril of sedentary living, but could this form of exercise really stimulate the bones to build new bone?
Well, I have good news for all you swimmers: Studies from all around the world suggest that you not only can maintain bone density with aquatic exercise, you can also build bone.
How water exercise helps after menopause
Several studies over the years that have found that water exercise does indeed offer benefits for bone building in postmenopausal women â but not in terms of bone density increase. Rotstein and colleagues (2008) followed a group of 35 postmenopausal women for seven months as they participated in hour-long water exercise three times a week. They found that the mineral content of the womenâs bones improved â meaning, the bones were stronger â but their bone density wasnât noticeably greater.
This has been a fairly constant theme in research of water exercise and bone health: Swimmersâ bone densities are found to be comparable to sedentary control subjects, but their rate of bone turnover is significantly higher (GĂłmez-Bruton et al., 2013), meaning their bones became more resistant to fracture and able to repair themselves more effectively.
Personally, Iâm happy for women to have stronger bones even if theyâre not dense â Iâve long maintained that strong bones are the key to avoid debilitating fractures. Brazilian researchers, however, have been getting great results on both fronts by using a high-intensity interval-training method in their water exercise studies.
In 2014, one study (Moreira et al. 2014) found that high-intensity water exercise for 6 months reduced bone resorption markers even though bone density didnât change â not that different from what earlier research found. More recently, however, Aboarrage and colleagues (2018) trained study participants in a high-intensity aquatic exercise protocol that included a form of interval training using jumping and hopping performed for 20 minutes in warm water that was about chest deep.
This new study offers a different twist: By using exercise that encouraged jumping in water and fairly high exertion, the water exercisers increased bone density throughout the body, and specifically in the spine and femur. As an added bonus, the exercise group also had greater leg strength and agility after the six-month time frame than the controls.
Swimming builds better bones
For those who prefer water exercise, this is great news! Youâre not shortchanging your bones by swimming or doing water aerobics. And if, for one reason or another, you canât perform other types of exercise due to severe joint pain or poor balance â or perhaps youâre recovering from a fracture to an arm or a leg â exercising in water is one way to keep your muscles strong without overloading your joints or risking a fall. So, I for one am going to let go of the mentality that water exercise isnât useful for promoting bone health. Jump in, the waterâs fine â and itâs good for your bones!
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Aboarrage, AM Jr, La Escala Teixeira CV, Dos Santos RN, et al. A high-intensity jump-based aquatic exercise program improves bone mineral density and functional fitness in postmenopausal women. Rejuvenation Research 2018;21(6). Rej.2018.2069
GĂłmez-Bruton A, GĂłnzalez-AgĂŒero A, GĂłmez-Cabello A, et al. Is bone tissue really affected by swimming? A systematic review. PLoS One 2013;8(8):e70119.
Moreira LD, Fronza FC, Dos Santos RN, et al. The benefits of a high-intensity aquatic exercise program (HydrOS) for bone metabolism and bone mass of postmenopausal women. J Bone Miner Metab. 2014;32(4): 411-419.
Rotstein A, Harush M, Vaisman N. The effect of a water exercise program on bone density of postmenopausal women. J Sports Med Phys Fitness 2008;48(3):352-359.
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