Featured Research

from universities, journals, and other organizations

High-intensity exercise for people with heart disease

Date:
September 20, 2013
Source:
The Norwegian University of Science and Technology (NTNU)
Summary:
High-intensity exercise is shown to be protective against coronary heart disease (CHD) and is well known as a popular and time-saving approach to getting fit. But what about people who already have heart disease? Previously, these patients were told to exercise, but only at a moderate intensity to protect their hearts. More recently, however, researchers have found that high-intensity exercise is very beneficial for these patients.

High-intensity exercise is shown to be protective against coronary heart disease (CHD) and is well known as a popular and time-saving approach to getting fit. But what about people who already have heart disease? Previously, these patients were told to exercise, but only at a moderate intensity to protect their hearts. More recently, however, researchers have found that high-intensity exercise is very beneficial for these patients. But how intense should these sessions actually be?

A new study from the K. G. Jebsen -- Center of Exercise in Medicine at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway examines this question in detail. Researchers analysed data from four randomized, controlled trials conducted at the center to try to determine what characterized the most effective high-intensity training programme for this patient group.

The researchers used changes in VO2max, which is peak oxygen uptake, as a measure of the effectiveness of the different exercise regimens. The study participants (n=112) were aged 18+ and all had coronary heart disease. The exercise period lasted for 12 weeks. The participants either ran/walked on a treadmill, walked uphill outdoors or trained in a group, all following the 4x4 exercise model. The 4x4 exercise model involves 4 minutes of high-intensity exercise followed by 3 minutes of moderate-intensity exercise, repeated 4 times.

Interval intensity important "When we compared VO2max before and after the training period, we found that the number of training sessions, the subject's age or baseline fitness levels had no impact," says Trine Moholdt, a postdoctoral fellow at the center and lead author of the study. "But the intensity of the intervals had a significant effect, and seems to be the most important characteristic of an effective interval session."

The intensity of the training was categorized according to the participant's heart rate zone (% of maximum heart rate (HRmax)). High-intensity training is when an individual's HR during intensive periods is 85-95% of HRmax.

Overall, VO2max increased by 11.9 % after an average of 23.4 training sessions during the 12-week period for all subjects. However, when participants exercised at an intensity that was greater than 92 % of their HRmax during the high-intensity periods, the effect was even greater than at the lower intensity levels, indicating that there is a dose-response relationship even in the 85-95% high-intensity zone.

Answering practical questions Moholdt says that people who start exercising using interval training often have lots of practical questions. How much incline should their treadmill have? Can they shorten their lower-intensity time to just 2 minutes? Why 4 minutes and not 5?

"Knowing that pushing yourself to over 90 % of HRmax may save you from an extra training session that week encourages us to investigate even the small details," says Moholdt. "When people give priority to exercise in their otherwise busy lives, they want to know that they are doing it the right way. At the same time, I want to emphasize that all exercise is better than none! Some people are not able to exercise at high intensity because of other health problems, and one should then look for other alternatives."

The four studies, which were composed of patients who either had acute coronary syndrome or angina pectoris, confirmed previous findings that high-intensity exercise is safe, even for patients with CHD. Moholdt says it would be interesting to see if these finding hold true for healthy subjects, as well as for patients with more severe heart disease.


Story Source:

The above story is based on materials provided by The Norwegian University of Science and Technology (NTNU). Note: Materials may be edited for content and length.


Cite This Page:

The Norwegian University of Science and Technology (NTNU). "High-intensity exercise for people with heart disease." ScienceDaily. ScienceDaily, 20 September 2013. <www.sciencedaily.com/releases/2013/09/130920094629.htm>.
The Norwegian University of Science and Technology (NTNU). (2013, September 20). High-intensity exercise for people with heart disease. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2013/09/130920094629.htm
The Norwegian University of Science and Technology (NTNU). "High-intensity exercise for people with heart disease." ScienceDaily. www.sciencedaily.com/releases/2013/09/130920094629.htm (accessed August 20, 2014).

Share This




More Health & Medicine News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola-Hit Sierra Leone's Freetown a City on Edge

Ebola-Hit Sierra Leone's Freetown a City on Edge

AFP (Aug. 19, 2014) Residents of Sierra Leone's capital voice their fears as the Ebola virus sweeps through west Africa. Duration: 00:56 Video provided by AFP
Powered by NewsLook.com
101-Year-Old Working Man Has All The Advice You Need

101-Year-Old Working Man Has All The Advice You Need

Newsy (Aug. 19, 2014) Herman Goldman has worked at the same lighting store for almost 75 years. Find out his secrets to a happy, productive life. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
American Ebola Patient Apparently Improving, Outbreak Is Not

American Ebola Patient Apparently Improving, Outbreak Is Not

Newsy (Aug. 19, 2014) Nancy Writebol, an American missionary who contracted Ebola, is apparently getting better, according to her husband. The outbreak, however, is not. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins