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Another article from Osteoporosis International:
Ball, J.M., Cagle, P., Johnson, B.E., Lucasey, C., & Lukert, B.P. (2009). Spinal extension exercises prevent natural progression of kyphosis. Osteoporosis International, 20: 481 - 489.
Many of you will have seen older ladies with a pronounced 'hunched back' or bent over posture - it is sometimes called a dowagers' hump, and it is often associated with osteoporosis. If individuals have brittle bones in their spine, and if these bones then fracture, they often 'compress' down before they heal. These 'compression' fractures are one of the main reasons for substantial height loss in elderly women (small amounts of height loss (less than 1 and 1/2 inches) can be caused by other things).
I found a good picture of what a compression fracture looks like here
We were very interested in this study, because we are interested to see if there are any ways, through exercise, that you can prevent the onset of spinal curvature as you get older (or at least, reduce the risk!). If you have poor posture, you can be at increased risk of compression fracture - a rounded back means more gravitational force through the shoulders - much better if you have good posture.
This study, conducted at Kansas University Medical centre, was divided into two parts. The first part sought to determine at what age the progression of height loss and spinal curvature, was fastest. The second part looked to see whether spine extension exercises would reduce the progression of height loss and spinal curvature with age.
Part one involved 250 women, aged between 30 and 79. All of the women had osteoporosis or osteopenia, but none of them had fractures in their spine (known as vertebral fractures, or vertebral compression fractures, of course). The researchers found that the greatest loss of height occurred in women between the ages of 50 and 59.
As the greatest height loss was found to occur in women between the ages of 50 and 59 , the second part of the study looked at the women in this age group.
Half of the women were assigned spine extension exercises to do, three times per week. The other half were told to continue with their normal daily activities. The study continued for one year.
At the end of the year, the researchers found that the women that did the spine extension exercises had no height loss, and no increase in spinal curvature, compared to the women that had not done the exercises, who did, on average, lose height.
There were a couple of flaws with the study (as there are with any study!). In particular, there was a very high dropout rate in the group of women told to complete the spine extension exercises (for example, many of the women did not do all of the exercises, or gave up some way through the year). The problem with a high dropout rate is that you don't know why people have dropped out - if they had back pain, for example, that was worsened by the exercises, their results would not have been included in the results of the 'exercising' group - and yet this could have increased the risk of height loss. An individual who had the same type of back pain in the other 'non exercising' group, would still very likely have had his or her results included, as she would not have had to do the exercises and so therefore would not have 'dropped out'.
On the other hand, there is usually a high dropout rate in this type of 'exercise intervention' study, so it may well have been motivation, rather than a physical factors, that caused individuals to drop out. The authors noted that the dropout rate was not particularly high compared to other similar studies.
We say: This is still a very encouraging study. What we thought was particularly interesting was how simple the exercise program was - it would have taken the average individual less than 10 minutes to complete, three times per week. Furthermore, although no one in the study had a history of fractures in the spine, it has been demonstrated that by maintaining a good posture, you reduce the risk of the fractures becoming 'wedge shaped' (crushed on one side more than the other - typically the narrowest part will be at the front of the vertebra), thereby increasing spinal curvature.
