After the post yesterday, a friend sent me an article published this year in Arch Intern Med. 2008;168(15):1638-1646. It is authored by people affiliated with the Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine.
In other words, these aren’t slouches.
They published the latest results of a 21 year longitudal study that looks at the health benefits of a group of runners compared to non-runners. I read the entire study and looked at their statistics and agree that their conclusion is proved. The conclusion is that Running at middle and older ages is associated with reduced disability in later life and a notable survival advantage.
Some thinks that are worth pointing out:
- The study subjects were runners 50 years or older. Just like the article that I linked to yesterday this is an older subject group. Meaning that for conclusive proof — in my mind — there will need to be some studies that follow runners in the 20-30 year old age range. However, it’s clear there is an association that carries over.
- Annual attrition rates after 21 years for subjects were approximately 3% for runners and 6% for controls (meaning non runners who never ran for a continuous period of six months or longer).
- In 1984 the runners were running an average of 237 minutes per week. That was reduced to 76 minutes per week (although they were exercising in other ways a total of 287 minutes per week) 21 years later in 2005. This shows that the runners we are talking about are not marathon distance or further. So this study really shows the benefits of running for non-marathoners.
- Members of the running group had significantly lower mean disability levels at all time points in the study.
- Lest you believe the control group just rested on their laurels in front of the tv this wasn’t true. In 1984 they had 15 minutes per week of running as a mean time and 87 minutes per week of vigorous exercise mean. This changed to 1 min/week of running and 138 min/week of vigorous by 2005. This shows an average mean increase of exercise yet both disability and attrition rates did not slow for the control group.
- The difference between runners and controls was most striking for women.
- The time required to reach specified levels of disability was significantly longer for runners than for controls.
- Looking at the causes of death it was clear that cardiovascular problems were the cause for 29 of the runners and 43 of the control group. Congestive heart failure however was 2 for each group. Cancer was 30 for runners and 41 for control. Infections caused the death of one runner and 15 control. Also neurological reasons killed 6 runners and 14 control. This is consistent with reports associating regular exercise with reduced incidence of dementia and several cancer types.
To me this means that runners can have great health benefits. The trick is to realize the risks that might already be there and set appropriate goals. The amount of time spent running for runners in this study is lower than the amount of time most people preparing for marathons run.
I have posted about some of the risks associated with running at higher levels. Of course risks are just that: risks. Risks don’t always pan out and they don’t affect everyone the same way. Just like the benefits shown in this study don’t affect all runners the same way.
I think it’s important to think about your own goals and aspirations. If you want to run marathons for reasons other then health feel free to do so. Of course, before embarking on any journey like that I would run it by my doctor and take any necessary precautions. Stay smart out there but by all means try to capture some of the benefits of running while you still can.
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