Health/Fitness « Weekly Gravy

Moderate-to-vigorous physical activity in middle age and beyond might help keep your brain healthy, a new study suggests. “Our study suggests that getting at least an hour and 15 minutes of moderate-to-vigorous-intensity physical activity a week or more during midlife may be important throughout your lifetime for promoting brain health and preserving the actual structure of your brain,” said study author Priya Palta, an epidemiologist at Columbia University Irving Medical Center in New York City. “In particular, engaging in more than 2.5 hours of physical activity per week in middle age was associated with fewer signs of brain disease,” she said. For the study, published online Jan. 6 in the journal Neurology, Palta’s team collected data on more than 1,600 people (average age: 53) who had five physical exams over 25 years and rated their weekly activity levels. Participants also had brain scans at the end of the study to measure their gray and white brain matter and areas of injury or disease in the brain. While the researchers only found a correlation, those participants who didn’t do moderate-to-vigorous intensity physical activity in midlife had 47% greater odds, on average, of developing small areas of brain damage compared to people who engaged in high levels of moderate-to-vigorous intensity physical activity. Higher activity levels were also associated with more intact white matter. White matter is tissue… read on > read on >

People who consume high levels of dietary vitamin C and E may lower their risk for Parkinson’s disease by almost a third, a new study suggests. Foods high in vitamin C include oranges, strawberries, broccoli and Brussels sprouts. Foods high in vitamin E include spinach, collard greens, pumpkin and nuts such as almonds and peanuts. How might the two nutrients ward off Parkinson’s? According to the European researchers involved in the new study, vitamins C and E are also antioxidants that could ward off the cell damage Parkinson’s causes. Specifically, antioxidants might help counteract “unstable” molecules and the oxidative stress that can lead to a loss of a brain chemical called dopamine, which is a hallmark of the condition. “The protective effect of vitamins on Parkinson’s disease risk might be limited to specific vitamins, such as vitamins E and C. Therefore, eating foods that are rich in vitamins E and C might help to prevent the development of Parkinson’s disease,” said researcher Essi Hantikainen, from the University of Milano-Bicocca in Italy. “Also, high concentrations of vitamin C are found in the central nervous system, where it has neuroprotective properties,” she explained. Hantikainen noted that this study can’t prove that vitamins E and C prevent Parkinson’s, only that high levels of these vitamins are associated with a lower risk of developing the disease. “Further research is… read on > read on >

If you want to burn fat this winter, take your exercise outdoors, researchers say. A Canadian study suggests that vigorous exercise in cold weather may burn more fat than working out indoors. Regular physical activity speeds metabolism and helps regulate fat in the blood (“lipids”), and high-intensity training is better for burning fat than moderate-intensity exercise, the researchers said. Temperature also plays a role in metabolism during exercise. In the study, a group of moderately fit, overweight adults participated in two high-intensity exercise sessions. In both, they completed 10 one-minute cycling sprints at 90% effort. A 90-second recovery period of cycling at 30% effort followed each sprint. In one session, the temperature was about 70 degrees Fahrenheit (“thermoneutral”). In the other session, it was 32 degrees Fahrenheit. During both sessions, the researchers measured participants’ skin temperature, core body temperature, heart rate and the amount of oxygen delivered to the large thigh muscle. “The present study found that high-intensity exercise in the cold increased lipid oxidation by 358% during the exercise bout in comparison to high-intensity exercise in a thermoneutral environment,” according to the report published online recently in the Journal of Applied Physiology. Longer-term metabolic responses after eating a high-fat meal did not change substantially after the cold condition, the researchers noted in a news release from the American Physiological Society. The lead researcher was… read on > read on >