Daniel Pendick

Study suggests testing bone health in older people less often may be safe

One key instruction in the operating manual for healthy aging is remaining ever vigilant about osteoporosis. That’s because loss of bone can lead to fractures that worsen quality of life and may even shorten life. The quest to identify osteoporosis early, so it can be treated, has led to widespread testing of bone mineral density (BMD), the key measure of bone strength.

The influential National Osteoporosis Foundation recommends checking for osteoporosis beginning at age 65 for women and 70 for men. Medicare pays for the gold-standard test, dual-energy X-ray absorptiometry (DEXA), every two years. Individuals can keep going back every two years, regardless of whether their previous scan was normal or not.

A study published today in the Journal of the American Medical Association (JAMA) raises a fundamental question: Is repeating testing of older people with normal bone strength every two years too much?

The study was led by public health researcher Dr. Sarah D. Berry of the Harvard-affiliated Institute for Aging Research at Hebrew SeniorLife in Boston. The researchers tracked 310 men and 492 women with an average age of 75 years for up to 10 years after they had an initial bone-density measurement.

Repeat testing four years after the first test found relatively few instances where someone lost enough bone mass to put them at heightened risk for hip fractures. Overall, repeat bone-density testing after four years improved the ability to identify those at higher risk by only 4%.

Time to slow down testing?

This is not the first study to suggest that frequent testing may be overkill for many older adults. The test itself is not especially dangerous, but it does come with inconvenience and large costs to the healthcare system. Is it time to reconsider testing bone density every two years in older people?

Based on this one study, that might be premature. “It’s not going to be a practice-changer,” says endocrinologist Dr. David Slovik, associate professor of medicine at Harvard Medical School and medical editor of Osteoporosis: A Guide to Prevention and Treatment, a Harvard Medical School Special Health Report. “This might get us to think more about how often to get bone density measurements, but there still a lot more study that needs to go into it.”

A lot of research has tried to nail the best interval down, but “it really depends on so many things,” Dr. Slovik says. They include age, of course, but also a previous fracture, family history of osteoporosis, and alcohol and tobacco use. That means the “sweet spot” for bone density testing depends a lot on whom you are testing.

However, if someone with normal bone density and would like to get tested less often than every other year, it’s perfectly reasonable to consider it. “It’s obviously up to the patient and the doctor,” Dr. Slovik says.

How to protect your bones

Though it’s wise to avoid tests and procedures you don’t need, it’s also important not to miss a sharp decline in bone strength. Simply put, a hip fracture in an older person can kill—not because of the break itself, but the downward spiral in health problems it often triggers.

Your doctor can help you figure out whether it makes sense for you to be tested for low bone density and how often it makes sense for you to be tested. The National Osteoporosis Foundation lists several factors that put an individual at risk for bone loss:

  • age 50 or older
  • being female
  • menopause.
  • a family history of osteoporosis
  • low body-mass index
  • loss of height
  • lack of physical activity
  • not enough calcium and vitamin D in the diet
  • not eating enough fruits and vegetables
  • drinking too much alcohol

Various diseases and medications can also lead to osteoporosis

The single best thing anyone can do to protect bone health is to exercise daily in a way that exerts force on bones. High-impact weight-bearing exercises like stair climbing, high-impact aerobics, and dancing are good, as is resistance training with weights or elastic bands. These kinds of exercise trigger the body’s natural bone-maintaining machinery. It’s also important to get adequate calcium and vitamin D every day, preferably from food. Current guidelines suggest adults older than 50 should get 1,000 mg to 1,200 mg per day of calcium and 800 to 1,000 IU of vitamin D, which helps the body absorb calcium.

Comments:

  1. Obat Kencing Nanah

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  3. regime rapide

    It’s frustrating to see conflicting scientific studies. The reason I started taking the L-Carnitine with alpha-lipoic acid supplement is because the study by Bruce Ames showed that these chemicals (in combination) actually improved health in rats and increased their longevity. Having been taking the supplement on and off, I noticed a difference (and yes, I realize it might be just a placebo effect or spurious relationship). Regardless, I want to keep taking the supplement, but this news is troubling.

    I’d greatly appreciate it if somebody can answer the following though: the article says “In studies in mice, TMAO has been shown to cause atherosclerosis, the disease process that leads to cholesterol-clogged arteries. We know that clogged coronary arteries can lead to heart attacks.” Question: Do clogged arteries strongly correlate with the levels of LDL or total cholesterol? I’m an athlete with good diet habbits and (relevant) genes, so my cholesterol levels are pretty good. Does this mean that I don’t have high risk of clogging arteries or does presence of TMAO clog the arteries regardless of what the cholesterol levels are? You can see where I’m going with this.

  4. Jesus

    Very important this article, great advice on how to take care of our bones in advance and avoid possible problems to reach a ripe old age …

    Thank you!

  5. Harvey Grove

    We mammals are promoted by the milk industry to drink 4 glasses of milk a day. When the mothers milk dries up there is no way to get milk unless we steal it from cows. Milk has lots of fat and calories but little protein. It is better to get your calcium from pills with no fat and no cholesterol. Babies need lots of protein as they double their weight in short order. They do this with the fat in milk by a process called GLUCONEOGENISIS which adults can not do. We live longer these days (average about 78yrs.). Years ago we did not live that long so osteoporosis was not such an issue.

  6. Harvey Grove

    The dose of calcium plus Vitamin D has been worked out by many doctors. If you do not follow their orders why do you continue to visit these experts?

    I’m 86 and have followed my docs orders for 15 years. No broken bones yet AND I HAD A COUPLE OF FALLS. THE MORTALITY RATE FOR OSTEOPOROSIS IS 25%. IT DEPENDS ON WHAT BONES YOU BREAK.

    Your height is checked because it is an indicator of fractures of vertebrae. If you lose height the distance between your hips and your diaphragm is reduced This could mean you are not getting adequate oxygen with each breath. That is why they check the oxygen in your blood with the gadget they put on your finger.

  7. Cinnamon Vogue

    Most of the evidence indicate that milk increases your chance of bone fractures. The best strategy is to do some weight lifting which is known to increase bone density. And eat healthy but a diverse range of foods. Never repeat patterns in food eating.

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    Agree with Helen,
    plenty of milk for our bone is good rather than manufactured drinks and foods. however, back to nature is always the best answer.

  9. Helen A. Bills

    As a child, I lived with my grandparents after the death of my mother. Grandpa was a milkman and we always had plenty of milk to drink. My dexascans have always been excellent. Looking at my own grandchildren and their friends I see the consumption of soda and fruit juice replacing milk in the modern child’s diet. It will be interesting to see if the rates of osteoporosis increase as these children become senior citizens.

    Thanks!!