Sticks, Stones & Pink Dumbbells May Break Your Bones

Falls are the leading cause of death due to injury among the elderly (1). In fact, elderly patients are 3 times as likely to die following a ground-level fall compared to young adults (2). This is often due to weak bones. The misconception is that elders fall and then break their bones, but the sad reality is that their bones break first, and then they fall. That's how fragile the average person becomes as they age.

Of course, we all know the importance of "use it or lose it," but what's disturbing is that people believe that they can use very little to prevent bone loss. That's not true. Weightbearing exercise is important, but the load must be significant and it should be applied to the axial skeleton, not just the appendicular skeleton. In other words, the load should be supported by the spine, not just raised by the limbs.

So if you plan to use exercise to help you prevent bone loss, make sure you do the right thing. There's a big difference between wrist curls and back squats. There's also a big difference between raising two pink dumbbells and a heavy loaded barbell.

Iron Man vs. Pepper Potts

Gwyneth Paltrow is an Oscar-winning actress who I believe has done a wonderful job at promoting physical activity to the masses, but I'm not so sure that her personal fitness regimen is ideal for bone health. You see, a few years ago Paltrow announced that she had osteopenia, a precursor to the brittle-bone disease osteoporosis (3). Now Paltrow is known to exercise regularly, as much as 6 times a week, but she believes that women should not lift weights more than 3 pounds and that they're just for muscle toning purpose (4). There are many factors that contribute to osteopenia, but it makes you wonder if Paltrow's bone condition would have been different if she trained less frequently with higher loads?

If you're truly interested in improving your bone density through exercise, here's what the research says:

  • Bone mass can be significantly increased by a strength regimen that uses high loads and low repetitions, but not by an endurance regimen that uses low loads and high repetitions (5).
  • The magnitude required to produce an effective stimulus for bone remodeling appears to be a 1-10 repetition maximum load, or 85-100% of your one repetition maximum (6).
  • Favour fast, explosive concentric (lifting) actions over slow concentric actions, and allow at least one day of rest between training sessions (7).

To your health,

John Paul Catanzaro

References

  1. How often falls occur. (2012). http://www.learnnottofall.com/content/fall-facts/how-often.jsp
  2. Cheng, J. (2010). For Elderly, Even Short Falls can be Deadly. University of Rochester Medical Center. https://www.urmc.rochester.edu/news/story/3020/for-elderly-even-short-falls-can-be-deadly.aspx
  3. Fisher, L. (2010). Is Gwyneth Paltrow's Diet to Blame for Bone Disease? http://abcnews.go.com/Entertainment/Wellness/gwyneth-paltrows-diet-blame-bone-disease/story?id=11034632
  4. Gwyneth Paltrow Diet, Exercise Routine, Workout Tips. http://healthyceleb.com/gwyneth-paltrow-diet-exercise-routine-workout-tips/5757
  5. Kerr D., Morton A., Dick I., Prince R. (1996). Exercise effects on bone mass in postmenopausal women are site-specific and load-dependent. J Bone Miner Res 11: 218-225.
  6. Kraemer, W. J. (1994). General adaptations to resistance and endurance training programs. In T. Baechle (Eds.), Essentials of strength training and conditioning (pp. 135-136). Champaign: Human Kinetics.
  7. Stengel, S. V., Kemmler W., Pintag R., Beeskow C., Weineck J., Lauber D., Kalender W. A., Engelke K. (2005). Power training is more effective than strength training for maintaining bone mineral density in postmenopausal women. J Appl Physiol 99: 181–188.

Posted Oct 27, 2015

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