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Fitness

Will Athletics Protect Your Bones?

You've probably heard being an athlete builds stronger bones. At first glance, a recent study appears to cast doubt on that claim, so let's have a look at the details.

Doug Dupont

Written by Doug Dupont Last updated on November 28, 2013

Bone health concerns many people who are beyond their prime athletic years. You might think if you eat healthy and work out, your bones will be good to go in the long run. But a study this month in the Journal of Strength and Conditioning Research may make you think otherwise.

In many ways your bones are like a tree – strong, yet supple. Your bones can withstand a tremendous amount of force, and yet they are flexible enough to not be brittle. The balance of mineral content and density is a precise one. Too great a variation in either direction can mean your bones aren’t strong enough to resist external forces or flexible enough to withstand an impact.

Your bones are also like your muscles, in that they respond to training. It’s well known that resistance exercise combined with a suitable diet will improve bone density in healthy adults. The problem is, as we age our bones can get weaker. Even worse, sometimes our bodies don’t respond to stimuli in the same way.

To shed some light on this issue, the researchers in this study looked at the bone health of various senior populations, ages 65 and older. Specifically, they looked at all of the following factors: age, sex, bodyweight, calcium and vitamin D consumption, and leg strength. Many of the participants were also elite senior athletes. The rest of the subjects were not athletes, but otherwise healthy.

Some of the results were expected. Sex, age, weight, and nutrition all had a major effect on bone density. Knee flexion strength (but not knee extension, oddly), also had an effect, but only on the hip bones. The other major result comes as a surprise, at least on the surface: being an elite athlete didn’t appear to yield significantly stronger bones.

To my mind, there are three factors we need to consider when we analyze these results:

  1. Bodyweight: Bodyweight was one of the biggest factors on bone density, in part because load and impact are are each affected by bodyweight. The athletes who participated in the study were lighter than the non-athletes. Since the athletes’ bones were just as strong as the non-athletes, it’s possible the athletics made up the difference.
  2. Type of Sport: Less than half of the athletes were runners. The researchers noted that running increases whole-body bone density, but the number of cyclists and swimmers present in the study may have reduced this effect.
  3. Activity Level of Non-Athletes: Finally, the non-athletes were all healthy in this study, and so they were not necessarily inactive. Perhaps they did not represent a real sampling of the senior population.

So there you have it. Athletics don’t necessarily keep your bones healthier. Nevertheless, pound-for-pound, athletics seem to be effective and may also decrease bodyweight while still maintaining healthy bones.

References:

1. Jean McCrory, et. al., “Competitive Athletic Participation, Thigh Muscle Strength, and Bone Density in Elite Senior Athletes and Controls,” Journal of Strength and Conditioning Research, 27(11), 2013.

Photo courtesy of Shutterstock.

Doug Dupont

About Doug Dupont

Having grown up at the foot of a forest covered mountain in rural Vermont, Doug was active from a very young age. Hiking, running, and climbing were a part of everyday life in the Green Mountains. This culture of exercise led to dabbling in martial arts as a teen, and also getting work in a local powerlifting focused gym. Doug continued to pursue knowledge and training in exercise, becoming a certified personal trainer while still a teenager. Once in college he began his hand at the business side of fitness, taking a management position at a large local gym. During that time he became a founding member of the UVM Brazilian Jiu Jitsu club, and was the first among their competition team. After only a few months he was assisting in coaching, and ran conditioning program for the club.

Out of college Doug set up his own training center. He grew his list of clientele including several professional MMA athletes, eventually going so far as to corner a world title fight. He has continued ­­­to develop his business into today.

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