Exercise and Fitness
Strength training is a popular term for exercises that build muscle by harnessing resistance against an opposing force. The resistance can come from your body, or from free weights, elasticized bands, or specialized machines. It makes muscles stronger. Another type of training, known as power training, is proving to be just as important as strength training in maintaining or restoring function. As the name suggests, power training is aimed at increasing power, which is the product of both strength and speed. Optimal power reflects how quickly you can exert force to produce the desired movement. Here’s an example: Faced with a four-lane intersection, you may have enough strength to walk across the street. But it’s power, not just strength, that can get you across all four lanes of traffic before the light changes. Likewise, power can prevent falls by helping you react swiftly if you start to trip or lose your balance. Some power moves are strength training exercises done at a faster speed. Others rely on the use of a weighted vest, which is worn while performing certain exercises that are typically aimed at improving functions such as bending, reaching, lifting, and rising from a seated position.
Physical and mental activities are both important for protecting your thinking skills and warding off dementia. But does one trump the other? A study published yesterday in JAMA Internal Medicine tried to tease out if one was better than the other for brain health. Researchers recruited 126 older adults who felt that their memory or thinking skills had recently gotten worse, and divided them into four groups. All were asked to do an hour of mental activity three times a week and an hour of physical activity three times a week. What differed were the intensities of these activities. After 12 weeks, scores on thinking tests improved across the board. The big surprise was that there weren’t any real differences in improvement between the groups. The researchers concluded that the amount of activity is more important for stimulating the brain than the type of activity, because all of the participants both exercised and engaged in mental activities each week.
Type 2 diabetes doesn’t usually appear all of a sudden. Many people have a long, slow, invisible lead-in to it called prediabetes. During this period, blood sugar levels are higher than normal. However, they’re not high enough to cause symptoms or to be classified as diabetes. It’s still possible at this stage to prevent the slide into full-blown diabetes. Think of prediabetes as a wake-up call. Unfortunately, few people ever hear the alarm. A new report from the Centers for Disease Control and Prevention shows that among Americans age 20 and older, only 10% of those with prediabetes know they have it. Given that as many as 73 million Americans have prediabetes, that’s a lot of missed opportunities to prevent the ravages of diabetes. One reason many people don’t know that they may be headed toward diabetes is they’ve never had their blood sugar tested. This simple test isn’t part of routine preventive care, but perhaps it should be.
New guidelines for recognizing and managing sports-related concussions could help protect the brains of millions of athletes at all levels of play, from professional football to youth soccer. The guidelines, released today by the American Academy of Neurology (AAN), replace a now-outdated set published in 1997. The guidelines step away from trying to “grade” concussions or diagnose them on the field or sidelines. Instead, they focus on immediately removing from play athletes who are suspected of having a concussion until they can be evaluated. “When in doubt, sit it out.” The AAN estimates that concussions cause between 1.6 million and 3.8 million mild brain injuries each year. Many athletes don’t get medical attention for these injuries, often because they or their coaches don’t recognize the warning signs or take them seriously. The new guidelines should help better identify athletes who have suffered concussions and improve how concussions are managed and treated.
As a huge, snowy Nor’easter barrels into New England, I’m thinking about all the shoveling I’ll be doing over the next couple days. Luckily I have three teenagers to help. But now that I’m of an AARP age, I have to be more mindful of the cardiovascular effects of shoveling. Snow shoveling is a known trigger for heart attacks. Emergency rooms in the snowbelt gear up for extra cases during significant snow storms. What’s the connection? Many people who shovel snow rarely exercise. Picking up a shovel and moving hundreds of pounds of snow, particularly after doing nothing physical for several months, can put a big strain on the heart. Pushing a heavy snow blower can do the same thing. Cold weather also contributes. Tips for protecting the heart include shoveling many light loads instead of fewer heavy ones, taking frequent breaks, and hiring a teenager.
Many exercise programs these days spotlight the ever-present abs (abdominal muscles) but pay little attention to the other muscles that form the body’s core. Yet building up all of your core muscles is essential for staying strong and flexible and improving performance in almost any sport. It’s also vital for sidestepping debilitating back pain. Your core includes your back, side, pelvic, and buttock muscles, as well as the abdominal muscles. The core forms a sturdy central link between your upper and lower body. Much like the trunk of a tree, core muscles need to be strong yet flexible. A strong, flexible core underpins almost everything you do, from everyday actions like bending to put on shoes to on-the-job tasks, sports and sexual activity, and more. A strong core can also help you keep your back healthy or recover from back pain. It’s unwise to aim all your efforts at developing rippling abs. Overtraining abdominal muscles while snubbing muscles of the back and hip can set you up for injuries and cut athletic prowess.
Do you have trouble sleeping? If you’re carrying extra pounds, especially around your belly, losing weight and some of that muffin top may help you get better ZZZs. So say researchers from Johns Hopkins University School of Medicine, who presented their findings at this year’s annual meeting of the American Heart Association. In a six-month trial that included 77 overweight volunteers, weight loss through diet plus exercise or diet alone improved sleep. A reduction in belly fat was the best predictor of improved sleep. Among people who are overweight, weight loss can reduce sleep apnea, a nighttime breathing problem that leads to frequent awakenings. Exercise has also been shown to improve sleep quality. Despite what thousands of websites want you to believe, there are no exercises or potions that “melt away” belly fat. Instead, the solution is old-fashioned exercise and a healthy diet.
Many medical studies confirm what we know or suspect. Every once in a while, though, one surprises us, turning “conventional wisdom” on its head. That just happened with the sudden shutdown of a long-running diabetes trial called Look AHEAD (Action for Health in Diabetes). Begun in 2001 and scheduled to last another two years, Look AHEAD was designed to see if an intensive diet and weight loss program could reduce the number of heart attacks, strokes, and other cardiovascular problems in people with type 2 diabetes. An early peek at the data showed that the program had little apparent effect, and the investigators concluded it would be futile to continue. This does not mean that we should ignore diet and exercise in treating of type 2 diabetes. Instead, the details of the study results, which haven’t yet been published, are likely to reveal other explanations.
Bicycling is a terrific way to get from one place to another. It’s also an excellent form of exercise. Some men and women avoid bicycling, though, because they worry that it may damage their reproductive organs and harm their sexual function. This mainly happens to people who cycle a lot. And it isn’t inevitable. One problem is the design of many bicycle seats, which put pressure on the perineum, a region of the body that runs from the anus to the sex organs. It contains the nerves and arteries that supply the penis in men and the clitoris and labia in women. You don’t have to give up biking to preserve your sexual function. Take a few simple precautions, like picking a wider seat, and shifting your position and taking breaks during long rides. These precautions will ensure that your passion for exercise doesn’t interfere with your passion in the bedroom.
What would you pay to keep from getting sick as you get older? How about a daily walk or other exercise? A new study suggests that’s exactly the right investment. In the study, people who were the most fit at midlife lived longer and spent less time being sick than middle-aged folks who weren’t fit. There are many benefits to staying physically active and exercising daily. One important effect of exercise that doesn’t get enough attention is that it improves fitness. Fitness is a measure of how well your heart, blood vessels, blood, and lungs work together to supply muscles with oxygen during sustained exercise. How do you improve your fitness? Increase the amount and the intensity of exercise over time. Don’t rush it. Improving fitness starts within weeks but will continue for months.