There is no escaping the evidence that regular moderate exercise is associated with a host of medical benefits. Among those benefits are perhaps improved memory and cognition, and questionably a decreased risk of developing dementia.
The latest study to show this correlation involved younger and older adults who wore a step-monitor. The number of steps they took during the study interval was then correlated with their performance on neuropsychological testing. The researchers found that for the older adults, but not younger adults, more physical activity correlated with better overall cognitive performance, but especially for face-name recognition.
This is a small study, with 60 subjects total. Also, the study is correlational only. It is possible that healthier older adults are both more physically active and cognitively nimble, because of underlying biological fitness. More cognitively active older adults may also be more physically active – the lines of cause and effect are plausible in multiple ways. (more…)
When skeptics hear the term “vibration” a red flag goes up, because that is a common term used in pseudoscientific jargon. Vibrations are often used to refer vaguely to energy or some physical or even spiritual property that cannot be detected, and is used in a hand-waving manner to explain extraordinary claims.
Vibrations, however, are also a real thing, referring to physical oscillations. Whole body vibration therapy (WBVT) refers to these legitimate physical vibrations. It is being offered as a treatment for balance, back pain, neurological disorders, and also simple fitness. Does it actually work, however, for the indications claimed?
What is WBVT?
WBVT is considered a passive exercise modality, in which something is being done to the person, rather than the person actively engaging in an activity, such as walking, weight lifting, or swimming. With WBVT users lay, sit, or stand on a platform that vibrates rapidly in one or more directions. The idea is that the rapid vibrations force the muscles of the body to contract in reaction, providing a form of exercise.
Science functions best when it is free from any bias or conflict of interest. All those engaged in the process should value what is actually true more than anything else. Unfortunately, there are many sources of bias in science.
Researchers may want their pet theory to be supported. Journal editors want to publish research that will have a high impact. And of course, corporations would prefer that the results of scientific research favor their products and services. A recent round of editorials accuses the Coca-Cola company of trying to put its thumb on the scale of science in order to deflect attention away from sugary drinks as a source of obesity and overweight. What are they doing and what does the science actually say?
According to The New York Times:
The beverage giant has teamed up with influential scientists who are advancing this message in medical journals, at conferences and through social media. To help the scientists get the word out, Coke has provided financial and logistical support to a new nonprofit organization called the Global Energy Balance Network, which promotes the argument that weight-conscious Americans are overly fixated on how much they eat and drink while not paying enough attention to exercise.
Ski faster with coconut water?
I don’t tend to worry too much about hydration, except when I exercise. I’ve been running regularly for over 15 years, and since I started I’ve usually carried water, or for longer runs, I drink old-school Gatorade. The formulation is basic: sugar, salt, and potassium. There are hundreds of electrolyte products marketed for athletics, but I’ve been faithful to the original: It’s cheap, I don’t mind the taste (even when it’s warm), you can buy it nearly anywhere, and it’s the usual liquid (besides water) offered at races. After exercise, I rehydrate with plain water, preferring to get my electrolytes and carbohydrates from food, rather than a specialty beverage, some of which are “designed” to support rehydration after exercise. The science of sports and hydration is constantly evolving, and so is the marketing. I’m apparently an outlier by still running with Gatorade. New hydration products criticize Gatorade for being artificial and inferior, arguing that natural sources of hydration are better. There’s been an explosion of rehydration beverages, marketed both for everyday hydration and sport purposes. Coconut water was the first natural product to find fairly wide popularity as a sports-oriented beverage. Now you can find maple water, cactus water, watermelon juice and even artichoke water. Is “natural” hydration better that substitutes, including plain old water? (more…)
Do you have any skeptical blind spots? I’ve had a skeptical perspective for a long time (my teenage cynicism wasn’t just a phase) but the framework for my thinking has developed over years. Professionally, the blind spot that the pharmacy profession has towards supplements and alternatives to medicine was only clear after I spent some time working in a pharmacy with thriving homeopathy sales. In looking for some credible evidence to guide my recommendations, I discovered there was quite literally nothing to homeopathy. Once I discovered blogs like Respectful Insolence, the critical thinking process, and scientific skepticism, took off. (more…)
Multivitamin supplementation has been getting a rough ride in the literature, as evidence emerges that routine supplementation for most is, at best, unnecessary. Some individual vitamins are earning their own unattractive risk/benefit profiles: Products like folic acid, calcium, and beta-carotene all seem inadvisable for routine supplementation in the absence of deficiency or medical indication. Vitamin E, already on the watch list, looks increasingly problematic, with data recently published confirming the suspected association of supplementation with an elevated risk of prostate cancer.
Reading through the vitamin posts here at SBM, one issue comes through repeatedly: The danger of assuming therapeutic benefits in the absence of confirmatory evidence. Vitamin supplement have the patina of safety and of health, a feature that’s reinforced when you purchase them: You don’t need a prescription, you don’t get counseled on their use, and there isn’t a long list of frightening potential side effects to accompany the product. You can pull a bottle off the shelf, and take any dose you want. After all, how harmful can vitamins be when you can buy 5 pounds of vitamin C at a time, or vitamin E capsules in a 1000-pack? But the research signals seem to be getting stronger, and most are pointing in the same direction: what we though we knew about antioxidants was based on simplistic hypotheses about nutrition and health. And while we thought we were doing ourselves good with antioxidant supplements, we may have been doing harm. (more…)
I recently watched a special news report about John McCain leading the charge towards making legislative earmarks illegal. The Economist defines earmarks this way:
Earmarks, for the uninitiated, are spending projects that are directly requested by individual members of Congress and are not subject to competitive bidding.
Most Americans are rightly upset about the practice of slipping pet projects into larger, well-vetted, and consensus-built legislative initiatives. They know instinctively that it’s morally wrong to sneak in personal favors and appropriate tax payer dollars to special interest groups without allowing others to weigh in. I certainly hope that McCain and his peers will succeed in discontinuing this corrupt practice.
Coincidentally, just after I watched this news report about earmarks, I went online to catch up on my blog reading. The first post I encountered made reference to an opinion piece written by Deepak Chopra, Andrew Weil, Dean Ornish, and Rustum Roy in the Wall Street Journal. Chopra et al. were asking Americans to redouble their efforts to adopt healthy lifestyles (including wholesome diets and regular physical activity) as a means to promote good health and avoid disease. At the end of the article they slipped in a plea for President-elect Obama to consider integrating alternative medicine practices (which included everything from healthy diet to meditation and acupuncture) into a government-sponsored approach to health.
I know I should exercise regularly, but I’m congenitally lazy and am ingenious at coming up with excuses. There’s an exercise machine that sounds like the end of all excuses, a dream come true. You’ve probably seen the ads in various magazines. The ROM Machine: “Exercise in Exactly 4 Minutes per Day.” It claims that you can get the same benefit, at home, from 4 minutes a day on the ROM as you can from 20 to 45 minutes aerobic exercise plus 45 minutes weight training plus 20 minutes stretching at the gym. It allegedly balances blood sugar and repairs bad backs. It is for everyone from age 10 to over 100.
Does this sound too good to be true? That’s usually a clue that it is too good to be true. I was skeptical and I sent in for the company’s free DVD. There were more clues in the DVD. They had testimonials from 2 chiropractors, several trainers, and lots of satisfied users, but they didn’t have recommendations from a single medical doctor or scientist. In fact, they mentioned a couple of doctors who disputed their claims, including one cardiologist who told his patient that kind of strenuous exercise could kill him. To prove you could get a good workout from the machine, they put people on it, got them to huff and puff and sweat a lot, and then got them to say, “That was a real workout!” (more…)