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Mass. General study shows how exercise changes structure and function of heart
April 23, 2008Study of Harvard athletes finds different effect of endurance, strength training
For the first time researchers are beginning to understand exactly how various forms of exercise impact the heart. Massachusetts General Hospital (MGH) investigators, in collaboration with the Harvard University Health Services, have found that 90 days of vigorous athletic training produces significant changes in cardiac structure and function and that the type of change varies with the type of exercise performed. Their study appears in the April Journal of Applied Physiology.
"Most of what we know about cardiac changes in athletes and other physically active people comes from 'snapshots,' taken at one specific point in time. What we did in this first-of-a-kind study was to follow athletes over several months to determine how the training process actually causes change to occur," says Aaron Baggish, MD, a fellow in the MGH Cardiology Division and lead author of the study.
To investigate how exercise affects the heart over time, the MGH researchers enrolled two groups of Harvard University student athletes at the beginning of the fall 2006 semester. One group was comprised of endurance athletes - 20 male and 20 female rowers - and the other, strength athletes - 35 male football players. Student athletes were studied while participating their normal team training, with emphasis on how the heart adapts to a typical season of competitive athletics.
Echocardiography studies - ultrasound examination of the heart's structure and function - were taken at the beginning and end of the 90-day study period. Participants followed the normal training regimens developed by their coaches and trainers, and weekly training activity was recorded. Endurance training included one- to three-hour sessions of on-water practice or use of indoor rowing equipment. The strength athletes took part in skill-focused drills, exercises designed to improve muscle strength and reaction time, and supervised weight training. Participants also were questioned confidentially about the use of steroids, and any who reported such use were excluded from the study.
At the end of the 90-day study period, both groups had significant overall increases in the size of their hearts. For endurance athletes, the left and right ventricles - the chambers that send blood into the aorta and to the lungs, respectively - expanded. In contrast, the heart muscle of the strength athletes tended to thicken, a phenomenon that appeared to be confined to the left ventricle. The most significant functional differences related to the relaxation of the heart muscle between beats - which increased in the endurance athletes but decreased in strength athletes, while still remaining within normal ranges.
"We were quite surprised by both the magnitude of changes over a relatively short period and by how great the differences were between the two groups of athletes," Baggish says. "The functional differences raise questions about the potential impact of long-term training, which should be followed up in future studies."
While this study looks at young athletes with healthy hearts, the information it provides may someday benefit heart disease patients. "The take-home message is that, just as not all heart disease is equal, not all exercise prescriptions are equal," Baggish explains. "This should start us thinking about whether we should tailor the type of exercise patients should do to their specific type of heart disease. The concept will need to be studied in heart disease patients before we can make any definitive recommendations."
Massachusetts General Hospital
To investigate how exercise affects the heart over time, the MGH researchers enrolled two groups of Harvard University student athletes at the beginning of the fall 2006 semester. One group was comprised of endurance athletes - 20 male and 20 female rowers - and the other, strength athletes - 35 male football players. Student athletes were studied while participating their normal team training, with emphasis on how the heart adapts to a typical season of competitive athletics.
Echocardiography studies - ultrasound examination of the heart's structure and function - were taken at the beginning and end of the 90-day study period. Participants followed the normal training regimens developed by their coaches and trainers, and weekly training activity was recorded. Endurance training included one- to three-hour sessions of on-water practice or use of indoor rowing equipment. The strength athletes took part in skill-focused drills, exercises designed to improve muscle strength and reaction time, and supervised weight training. Participants also were questioned confidentially about the use of steroids, and any who reported such use were excluded from the study.
At the end of the 90-day study period, both groups had significant overall increases in the size of their hearts. For endurance athletes, the left and right ventricles - the chambers that send blood into the aorta and to the lungs, respectively - expanded. In contrast, the heart muscle of the strength athletes tended to thicken, a phenomenon that appeared to be confined to the left ventricle. The most significant functional differences related to the relaxation of the heart muscle between beats - which increased in the endurance athletes but decreased in strength athletes, while still remaining within normal ranges.
"We were quite surprised by both the magnitude of changes over a relatively short period and by how great the differences were between the two groups of athletes," Baggish says. "The functional differences raise questions about the potential impact of long-term training, which should be followed up in future studies."
While this study looks at young athletes with healthy hearts, the information it provides may someday benefit heart disease patients. "The take-home message is that, just as not all heart disease is equal, not all exercise prescriptions are equal," Baggish explains. "This should start us thinking about whether we should tailor the type of exercise patients should do to their specific type of heart disease. The concept will need to be studied in heart disease patients before we can make any definitive recommendations."
Massachusetts General Hospital
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Neuroscientist scans brain for clues on best time to multitask
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Substance found in fruits and vegetables reduces likelihood of the flu
Mice given quercetin, a naturally occurring substance found in fruits and vegetables, were less likely to contract the flu, according to a study published by The American Physiological Society. The study also found that stressful exercise increased the susceptibility of mice to the flu, but quercetin canceled out that negative effect.
Sports-related sudden cardiac death is reduced by pre-participation cardiovascular screening
Young competitive athletes are perceived by the general population to be the healthiest members of society. The possibility that highly trained athletes may have a potentially serious cardiac condition that can predispose to life-threatening tachyarrhythmias or sudden cardiac death seems paradoxical.
Children's calorie expenditure, heart rate increase during active video games
Children burn more than four times as many calories per minute playing an active video game than playing a seated game, and their heart rate is also significantly higher with the active game.
Antidepressants need new nerve cells to be effective, researchers find
Researchers at UT Southwestern Medical Center have discovered in mice that the brain must create new nerve cells for either exercise or antidepressants to reduce depression-like behavior.
Flu shot does not reduce risk of death
The widely-held perception that the influenza vaccination reduces overall mortality risk in the elderly does not withstand careful scrutiny, according to researchers in Alberta.
Antidepressants need new nerve cells to be effective, UT Southwestern researchers find
Researchers at UT Southwestern Medical Center have discovered in mice that the brain must create new nerve cells for either exercise or antidepressants to reduce depression-like behavior.
Jumping for joy ... and stronger bones
High impact activities such as jumping and skipping that can easily be incorporated into warm-ups before sports and physical education classes, have been shown to benefit bone health in adolescents.
Java gives caffeine-naive a boost, too
New research from the University of Alberta in Edmonton, Canada, shows that-for women-the caffeine advantage is indeed everything it's cracked up to be. Females who don't drink coffee can get just as much of a caffeine boost as those who sip it regularly, according to a study in the latest edition of Nutrition Research.
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