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Kolata, a science reporter for the NY Times and an avid exerciser, interweaves her discovery of the exercise program Spinning with her pursuit of the answers to some fundamental questions concerning health and exercise. Her questions include: what's maximum heart rate, is there a fat-burning zone, does increased muscle mass increase metabolism, and how much exercise is necessary.
The answers may come as a surprise, especially if what you know about exercise was gleaned from the ever present infomercials of the last decade. However, if you're a natural skeptic (which I confess to being) the answers confirm a belief that much of what's accepted as fact and common knowledge is based on flawed science and reaching for conclusions that don't flow from the data.
Take for example the case of maximum heartrate. There is a nearly ubiquitous belief that one's maximum heartrate is equal to 220 minus one's age. Kolata writes that this formula is based on an extremely limited data set, and that a better formula has been published that is 208 minus .7 times one's age. However, individual variation is so large (plus or minus 20 beats per minute), that even this formula has questionable usefulness.
Or, how much exercise is "enough." Truth is, no one knows. From the observational studies done, it appears that the health benefit from exercise comes mostly when people move from the lowest fifth of activity level to the next to lowest fifth. Beyond that, health effects are small or nonexistent. If the goal of exercise is weight loss or reshaping the body, then a much higher intensity and frequency of exercise is required. But, even then it appears that people's genetics dictate the degree to which they'll respond, if at all.
At the core, the book consists of an avid exerciser and journalist questioning the fitness industry and its claims and the science or pseudo-science that it rests on. It's an easy read that may equip the reader to evaluate other claims for themselves, or at least spur them to question the conventional wisdom.
The real question may be how these same principles might be applied to the common knowledge surrounding other areas, such as the environment, evolution, social science, etc. Where fields of endeavor require drawing conclusions from observational studies, one must always be skeptical. Conclusions can sound logical, and formulas may even be derived, but cause and effect are not known for certain and correlations prove naught. As noted by the author above, the consequences of believing the observational studies regarding exercise are relatively mild. When policies of governments are based on similarly questionable science, the stakes get much higher.
Note: Reviewed by Stephen
-WebMD - Fitness Myths and Facts -- Gina Kolata -- 05/08/03
-FSG Books - Ultimate Fitness: The Quest for Truth About Exercise and Health
Patients in Florida Lining Up for All That Medicare Covers: Boca Raton, researchers agree, is a case study of what happens when people are given free rein to have all the medical care they could imagine. (GINA KOLATA, 9/13/03, NY Times)
Book-related and General Links:
-NHPR: The Exchange - Interview with Gina Kolata
Some studies involving sedentary seniors have been done. When they participate in light resistance training, bone density increases, and lifespan is increased, mostly through avoidance of damaging accidents and falls. Quality of life improves as well, with exercisers becoming able to bathe and dress themselves again.
- Michael Herdegen
- Jul-04-2003, 20:02