Moderate levels of exercise are often prescribed for people recovering from a heart attack or heart surgery, but pumping up workouts to high-intensity level may also be a safe option, according to a Norwegian study.
"The results of the current study indicate that the risk of a cardiovascular event is low after both high-intensity exercise and moderate-intensity exercise," wrote Oelvind Rognmo, lead author of the study and a researcher at the Norwegian University of Science and Technology, in the journal Circulation.
Rognmo said there is plenty of evidence that the harder people work out, the more benefit they gain in cardiovascular function. His team wanted to see if heart patients could benefit from high-intensity exercise, too.
The concern for heart patients, though, is that the higher exertion may carry an increased risk of heart malfunction.
Rognmo and his colleagues tracked 4,846 patients at three cardiac rehabilitation centres in Norway who racked up a combined total of more than 170,000 hours of aerobic exercise.
More than 129,450 hours was spent working out at moderate intensity and the rest was at high intensity. All people in the study participated in both types of exercise.
The moderately paced workouts included an hour of walking or other exercise at 60 to 70 percent of their maximum heart rate.
At high intensity, people trained at repeated four-minute intervals -- alternating high-impact exercise such as cycling, jogging or cross-country skiing, to get their heart rate up to 85-95 percent of capacity -- followed by four minutes of more relaxed activity, such as walking.
During the more than 129,000 hours people spent exercising moderately, one person died from cardiac arrest. During more than 46,000 hours of high-intensity workouts, two people had cardiac arrests but survived.
"We found that both types of intensities were involved with low event rates," Rognmo said.
"I think (high-intensity training) should be considered for patients with coronary heart disease."
But he and his colleagues wrote that the differences in the numbers of cardiac arrests was too small to conclude whether high-intensity exercise is more dangerous than less demanding workouts.
"I think we're on the right track, but before we make it a standard recommendation, let's get our safety data," said Steven Ketevian, the director of preventive cardiology at Henry Ford Hospital in Michigan, who was not involved in the study. SOURCE: http://bit.ly/OCEkC3
The researchers found that on average the rate of tuberculosis (TB) in big cities was twice the rate of the national TB incidence
Residual sour gas was then burnt in flares at Kashagan's processing plants, polluting the environment, the ministry said in a statement.
Researchers from Britain and the United States found what they describe as the first hard evidence that malaria creeps to higher elevations during warmer years
The CPC's latest outlook brings the forecaster in line with other global meteorologists that have raised their outlook for El Nino's potential return this year.
The child is the second case, following an earlier instance in Mississippi, in which doctors may have brought HIV in a newborn into remission by administering antiretroviral drugs in the first hours of life.
"We will resolutely declare war against pollution as we declared war against poverty," PM Li told the almost 3,000 delegates to the country's largely rubber-stamp legislature in a wide-ranging address carried live on state television.
The research, which lends weight to campaigns for smoking to be banned in private cars and homes, found passive smoking leads to a thickening of children's artery walls, adding some 3.3 years to the age of blood vessels by adulthood.
Professor Jean-Michel Claverie, from the National Centre of Scientific Research (CNRS) at the University of Aix-Marseille in France, said "this is the first time we've seen a virus that's still infectious after this length of time."
The 76-year-old man died on Sunday, 75 days after the operation, the Georges Pompidou European Hospital in Paris said in a statement, adding that the cause of his death could not be known for sure at this stage.
Pacific islanders were eating fewer coconuts as a source of fat and many people in Southeast Asia were getting fewer calories from rice
The researchers had been able to clone the antibodies and would test if they were able to give immunity to a person without the virus
The condition of the baby with kidney disease returns to normal after doctors in the Turkish city of Konya decide against abortion to begin treatment in the womb
Australia's conservative government approved plans to dredge 3 million cubic metres of sand for the port expansion
Frequent nightmares were very common for one in ten children, especially between the ages of three and seven, but effects resulting from nightmares were much more severe in 12-year-olds.
The JAMA Psychiatry suggested that tihis was in connection to sperm mutations in men who become fathers relatively late in life, after comparing children of 24-year-old fathers and 45-year-old fathers.
Millions of people around the world go to bed hungry every night, and yet millions of tons of food end up in trash cans or spoiled on the way to market.