Jan. 10, 2008 -- Overweight people who lose a moderate amount of weight get an immediate benefit in the form of better heart health, according to a study conducted at Washington University School of Medicine in St. Louis. And the heart improvements happen whether that weight is shed by eating less or exercising more.
"If individuals want to do something that's good for their heart, then my message to them is lose weight by the method they find most tolerable," says the study's senior author Sándor J. Kovács, Ph.D, M.D., director of the Cardiovascular Biophysics Laboratory and professor of medicine. "They're virtually guaranteed that it will have a salutary effect on their cardiovascular system."
Studying a group of healthy, overweight but not obese, middle-aged men and women, the researchers found that a yearlong regimen of either calorie restriction or exercise increase had positive effects on heart function. Their analysis revealed that heart function was restored to a more youthful state so that during the heart's filling phase (called diastole) it took less time for participants' hearts to relax and fill with blood. The findings will appear in an upcoming issue of the American Journal of Physiology and are now available online.
Your tissues are accumulating collagen fibers that are making your tissues more fibrotic and stiff. Do you react like I do when reading descriptions of aging and think "what a waste" and "how disgusting" and "we need to find out how to fix that" and the like?
"As we get older, our tissues become more fibrotic as collagen fibers accumulate," says study co-author John O. Holloszy, M.D., professor of medicine in the Division of Geriatrics and Nutritional Science. "So the arteries and heart muscle stiffen, and the heart doesn't relax as well after contracting. Similar studies that we've conducted with members of the Caloric Restriction with Optimal Nutrition Society (CRONies) show they have heart function resembling much younger people." CRONies voluntarily consume about 25 percent fewer calories than the average American while still maintaining good nutrition.
We shouldn't have stiff heart muscles. I realize that there is an election campaign going on in America about all sorts of issues. But isn't the fact that our heart muscles are getting stiffer more important than all those issues? You are falling apart. We don't have the technology to reverse it. Development of such technology is possible. Shouldn't we think that is more important than personality politics?
Gaining the ability to relax a heart more quickly is a good thing.
By the end of the yearlong study, both the calorie restriction and exercise groups of volunteers lost 12 percent of their weight and 12 percent of their body mass index (BMI), a measurement considered to be a fairly reliable indicator of the amount of body fat. In both groups, participants' hearts responded to this weight loss by gaining the ability to relax more quickly, recovering some of the elasticity characteristic of younger heart tissue. Those in the calorie restriction group achieved slightly more reduction of heart stiffness.
Sounds like the calorie restriction group got the bigger benefit.
The detailed analysis showed that in both groups, the left ventricle gained an increased capacity to expand to accommodate blood entering during diastole. In the calorie restriction group, the global stiffness of the left ventricle decreased, suggesting that the muscle and connective tissue of the heart more readily sprang back after the contraction phase. This group also experienced a decrease in the internal pressure gradient, indicating that their left ventricles had better suction ability.
So eat less. Eat better too.
|Share |||Randall Parker, 2008 January 20 10:19 PM Aging Cardiovascular Studies|