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
Despite all-out efforts to give the Chinese Communist Party blue skies for its twice-a-decade congress, Beijing's notorious smog has cloaked the mega-city in its trademark toxic haze.
Equipment donation to children's oncology institute is first project of state-run aid agency TIKA in Brazil
Some 450 other suspected cases seen in island nation; president says health workers are able to contain epidemic
UN says 900,000 doses of oral vaccine are to be given to Rohingya Muslims fleeing violence in neighboring Myanmar
3 cholera quarantine centers have been formed where victims are being treated
12 cases confirmed, 32 persons quarantined to halt spread of disease, says disease control body
Provided by UNICEF, vaccinations will be administered by public health officials in Syria’s Idlib province
Eggs tainted by the insecticide mostly originate from farms in those two countries but have since been found in 45 nations worldwide, the European health commissioner Vytenis Andriukaitisa said last week.
The UN says cholera is a major public health problem in the country with millions of cases registered every year. Last year, the disease claimed 817 lives there, according to the WHO.
The ministerial meeting will include representatives from some 30 countries, according to Canada's minister of environment and climate change, Catherine McKenna.
Cholera is endemic in Nigeria, with a rise in cases during rainy season from April to September, says disease control center
Police officers tested positive for cholera after eating infected food; health minister blames food workers
"Up to September 1, 14 deaths have been reported," the health ministry said in a statement, adding that "the total number of suspected cholera cases stands at 186."
Pharmaceutical company says treatment has more than 80 percent success rate for form of leukemia
Federal agency orders StemImmune to stop injecting vaccine into tumors of cancer patients
565,041 suspected cases of cholera have been recorded in the country since April 27