About Careers Internship MedBlogs Contact us
Slowly Increasing Exercise Intensity is Good for the Heart

Slowly Increasing Exercise Intensity is Good for the Heart

Font : A-A+

  • The American Heart Association has published a statement on exercise and heart health
  • It recommends that the intensity of exercise should be increased incrementally
  • It indicates that this will help to keep the heart healthy and reduce the chances of cardiac events

New scientific statement issued by the American Heart Association has made a startling revelation that despite the beneficial effects of low-intensity aerobic exercises, high-intensity exercises may be harmful to sedentary and unfit individuals who are unaccustomed to exercising.


This scientific statement, entitled "Exercise-related Acute Cardiovascular Events and Potential Deleterious Adaptations Following Long-Term Exercise Training: Placing the Risks into Perspective - An Update from the American Heart Association," has been published in the latest issue of Circulation, the premier journal of the American Heart Association.

The Chairman of the Writing Committee for the American Heart Association's Scientific Statement was Dr. Barry A. Franklin, PhD, who is Director of the Cardiac Rehabilitation Program and Exercise Laboratories at the William Beaumont Hospital, Royal Oak, Michigan. He is also a Professor of Physiology at Wayne State University School of Medicine, Detroit, Michigan, USA.

Intensive Exercise is Not Always Good for the Heart

Aerobic exercises, sometimes also called cardio-exercises, are usually performed at low intensity and are generally beneficial for the heart. These exercises increase the pumping capacity of the heart, as well as elevate tissue oxygenation levels. Hence, aerobic exercises are good for maintaining a healthy heart. Some examples include walking, jogging, cycling and swimming, among many other activities.

However, high-intensity and endurance exercises such as sprinting, running marathons or participating in triathlons can raise the risk of the following cardiac events: Importantly, it has been observed that in individuals participating in triathlons, 40 percent of cardiac events occur in first-time participants. This indicates that the lack of training/conditioning or underlying heart problems in these individuals could be responsible for the cardiac events.

"Exercise is medicine, and there is no question that moderate to vigorous physical activity is beneficial to overall cardiovascular health. However, like medicine, it is possible to underdose and overdose on exercise - more is not always better and can lead to cardiac events, particularly when performed by inactive, unfit, individuals with known or undiagnosed heart disease," says Franklin.

Findings on which the American Heart Association's Scientific Statement is Based

Based on the review process, which involved carefully scrutinizing over 300 scientific publications, the following major findings were made:
  • Exercise benefits the majority of people by improving physical fitness and outweighs the risks
  • 50 percent lower risk of sudden cardiac death and heart attacks occur in physically active individuals
  • Potential risks of cardiac events also occur due to intensive exercise training
  • 50 percent of cardiac events in marathon runners occur in the last mile
  • Physical activity at high altitudes significantly increases the risk of cardiac events
  • Risk of cardiac events can be reduced by acclimatization for one day at the particular altitude prior to commencing physical activity
  • Risk of atrial fibrillation is highest in sedentary individuals
  • Risk of atrial fibrillation is almost as high in individuals undergoing high-intensity exercise training
  • Atrial fibrillation risk is reduced by performing a moderate-intensity exercise
  • Risk of sudden cardiac death and heart attacks in male marathon runners has increased over the years
  • Risk of sudden cardiac death and heart attacks in female marathon runners is 3.5-fold lower than their male counterparts

American Heart Association's Recommendations for Implementing a Healthy Physical Activity Program

  • Light, warm-up exercises should precede moderate to vigorous exercises to allow the heart rate to rise gradually
  • At the beginning, walking on a plain surface is recommended for 6-8 weeks
  • After 6-8 weeks, walking-up hills, jogging and more vigorous activities can be performed
  • Duration of exercise should be increased gradually from 5 to 10 minutes at first, then slowly building-up till the desired time-limit is reached
  • Intensity of exercise should be reduced when the body is exposed to environmental stress, such as high humidity or high altitude
  • Cooling-down exercises, such as walking at a slow pace is recommended to allow the heart rate to come down to normal gradually
  • Individuals with confirmed heart disease, such as a prior heart attack, angioplasty or bypass surgery, should seek medical approval before starting an exercise program
  • Sedentary or inactive individuals should also seek medical approval prior to joining an exercise program
  • Exercising should be stopped immediately and medical advice should be sought if the following symptoms occur:

Concluding Remarks

Franklin concludes: "More people are running marathons, participating in triathlons and doing high-intensity interval training. The purpose of this statement is to put the benefits and risks of these vigorous exercise programs in perspective."

Funding Source

The American Heart Association received funding from various foundations, corporations, pharmaceutical companies and medical device manufacturers.

Reference :
  1. Exercise-Related Acute Cardiovascular Events and Potential Deleterious Adaptations Following Long-Term Exercise Training: Placing the Risks into Perspective - An Update: A Scientific Statement from the American Heart Association - (https://www.ahajournals.org/doi/abs/10.1161/CIR.0000000000000749)

Source: Medindia

Citations   close

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Dr. Kaushik Bharati. (2020, February 27). Slowly Increasing Exercise Intensity is Good for the Heart. Medindia. Retrieved on Jul 01, 2022 from https://www.medindia.net/news/healthinfocus/slowly-increasing-exercise-intensity-is-good-for-the-heart-193436-1.htm.

  • MLA

    Dr. Kaushik Bharati. "Slowly Increasing Exercise Intensity is Good for the Heart". Medindia. Jul 01, 2022. <https://www.medindia.net/news/healthinfocus/slowly-increasing-exercise-intensity-is-good-for-the-heart-193436-1.htm>.

  • Chicago

    Dr. Kaushik Bharati. "Slowly Increasing Exercise Intensity is Good for the Heart". Medindia. https://www.medindia.net/news/healthinfocus/slowly-increasing-exercise-intensity-is-good-for-the-heart-193436-1.htm. (accessed Jul 01, 2022).

  • Harvard

    Dr. Kaushik Bharati. 2021. Slowly Increasing Exercise Intensity is Good for the Heart. Medindia, viewed Jul 01, 2022, https://www.medindia.net/news/healthinfocus/slowly-increasing-exercise-intensity-is-good-for-the-heart-193436-1.htm.


News A-Z
What's New on Medindia
Are Menopause Symptoms Troubling You?: Try these Options
Vaccination  And Counter  Measures Against  Monkeypox
Indian Railways Special Concession on Health Grounds
View all
Recommended Reading
News Archive
News Category

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Diet Lifestyle and Heart Disease Tips to Live Longer Heart Healthy Heart Exercise and Fitness Lifestyle Modification: No Big Deal! Statins Body Types and Befitting Workouts Mitral Valve Prolapse Exercise To Gain Weight 

Most Popular on Medindia

Sanatogen Diaphragmatic Hernia Indian Medical Journals Iron Intake Calculator The Essence of Yoga Post-Nasal Drip Blood - Sugar Chart Loram (2 mg) (Lorazepam) Turmeric Powder - Health Benefits, Uses & Side Effects Drug Interaction Checker

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2022

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use
open close