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105 amateur cyclist is more aerobically fit than most 50-year-olds

17 Feb

Another amazing story from The New York Times about the capacities of an aging athlete:

At the age of 105, the French amateur cyclist and world-record holder Robert Marchand is more aerobically fit than most 50-year-olds — and appears to be getting even fitter as he ages, according to a revelatory new study of his physiology.

You can read the research paper here.

Cognitive benefits of midlife exercise

16 Jan

From The Journal of Alzheimer’s Disease, “Midlife Physical Activity and Cognition Later in Life: A Prospective Twin Study.” Here is the abstract:

Background: Physical activity has been associated with a reduced risk of cognitive decline but the nature of this association remains obscure. Objective: To study associations between midlife physical activity and cognition in old age for a prospective cohort of Finnish twins. Methods: Physical activity in the Finnish Twin Cohort was assessed using questionnaire responses collected in 1975 and 1981. After a mean follow-up of 25.1 years, the subjects’ (n = 3050; mean age 74.2; range 66–97) cognition was evaluated with a validated telephone interview. Both participation in vigorous physical activity, and the volume of physical activity, divided into quintiles, were used as predictors of cognitive impairment. Metrics collected by TELE were used to categorize participants as: cognitively impaired, suffering mild cognitive impairment, or cognitively healthy. Results: Participation in vigorous physical activity compared to non-participation for both 1975 and 1981 was associated with a lower risk of cognitive impairment in individual-based analyses (fully adjusted OR 0.50, 95% CI 0.35–0.73). Pairwise analyses yielded similar but statistically non-significant associations. In terms of the volume of physical activity, the most active quintile of individuals (OR 0.69, 95% CI 0.46–1.04) had a reduced risk of cognitive decline compared with the most sedentary quintile in the fully adjusted model although no clear dose-response was found. Conclusion: Vigorous midlife physical activity was associated with less cognitive impairment but without a clear dose-response association between the volume of physical activity and cognition.

“I believe people can do far more than they think they can.”

2 Jan

The New York Times ran this awe inspiring story about 85 year old marathon champion Ed Whitlock.

“He’s about as close as you can get to minimal aging in a human individual,” said Dr. Michael Joyner, a researcher at the Mayo Clinic who has studied performance and aging.

How our ancestors exercised (evidence against too much sitting)

30 Nov

From this weekend’s New York Times:

Are we fighting thousands of years of evolutionary history and the best interests of our bodies when we sit all day?That question is at the core of a fascinating new study of the daily lives and cardiovascular health of a modern tribe of hunter-gatherers. The findings strongly suggest that we are born to be in motion, with health consequences when we are not

You can read the abstract of the original research here.

I do yoga and the 10,000 steps a day program.

Dr. Mirkin: “Sitting Will Not Harm Vigorous Exercisers”

11 Nov

From Dr. Mirkin’s eZine:

Asking people to stand at work, rather than sit, is not good advice because standing-without-moving is no better than sitting, and will make you too tired to exercise vigorously when you are finished working. If you are a vigorous exerciser, standing all day will slow your recovery from your exercise program.

The highly-publicized studies that showed sitting is harmful for exercisers were flawed because they failed to separate casual exercisers from vigorous exercisers. No one has shown that standing up instead of sitting confers any special health benefits, and standing without moving around can cause additional problems such as varicose veins and swollen feet. Contracting muscles circulate extra blood to strengthen your heart and draw sugar from the bloodstream to lower high blood sugar levels. This does not happen when you just stand in one position without moving your muscles

I am not completely convinced, but I think he raises a good point about the failure of the study to consider individual differences in fitness as a confounding variable.

 

 

Passive exercise may have benefits

12 Oct

When I was a kid, there were a number of popular books touting the benefits of isometric exercise. It seemed like a great idea, exercise without equipment, sweat, or repetition. As I remember them, the books would feature highly muscled individuals performing the exercises. Now, I realize that these people must have gained their muscular physiques from workouts with weights, but at the time I was quite convinced.

Naturally, I have become suspicious of claims that you can exercise without exertion. But this article by Dr. Mirkin suggests that passive exercise may have benefits for otherwise inactive people:

The exciting new concept is that passive exercise — sitting on a motor-driven stationary bicycle and letting the pedals move the person’s legs for 30 minutes — burns extra calories and lowers blood sugar and insulin levels in inactive people (Med Sci Sprts Ex, Sept, 2016;48(9):1821-1828). Having their legs moved by motor-driven pedals increases insulin sensitivity by lowering blood sugar rises after eating.

Why exercise helps memory

29 Jun

A paper in the journal Cell Metabolism offers another explanation for the postive effect of exercise on memory:

“Here, we show that a muscle secretory factor, cathepsin B (CTSB) protein, is important for the cognitive and neurogenic benefits of running.”

Here is a journalistic summary:

“Working out is good for the brain. Now, a team of scientists from the U.S. and Germany has a clearer idea why. A protein called cathepsin B, produced and secreted by muscle during exercise, is required for exercise-induced memory improvement and brain cell production in mice, the scientists reported in Cell Metabolism today (June 23). They also showed that levels of cathepsin B are positively correlated with fitness and memory in humans”

 

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