Navigation Links
The heart responds differently to exercise in men vs. women

WASHINGTON (March 27, 2014) The formula for peak exercise heart rate that doctors have used for decades in tests to diagnose heart conditions may be flawed because it does not account for differences between men and women, according to research to be presented at the American College of Cardiology's 63rd Annual Scientific Session.

The simple formula of "220 minus age" has been widely used to calculate the maximum number of heart beats per minute a person can achieve. Many people use it to derive their target heart rate during a workout. Doctors use it to determine how hard a patient should exercise during a common diagnostic test known as the exercise stress test.

After analyzing more than 25,000 stress tests, the researchers found significant differences between men and women and developed an updated formula to reflect those nuances.

"The standard that's currently in use is somewhat outdated," said Thomas Allison, M.D., cardiologist and director of stress testing at Mayo Clinic, and senior author of the study. "We want to make sure that when people do the stress test, they have an accurate expectation of what a normal peak heart rate is. Every so often, you need to recalibrate what's considered normal."

The new formula can help people better optimize their workouts and also improve the accuracy of test results. Stress tests, which are commonly used to help diagnose conditions such as coronary heart disease, heart valve disease and heart failure, require patients to exercise near their top capacity while technicians monitor the patient's cardiac performance.

The researchers drew data from 25,000 patients who took stress tests at Mayo Clinic between 1993 and 2006. The sample included men and women 40 to 89 years of age who had no history of cardiovascular disease.

The study reveals that although everybody's peak heart rate declines with age, the decline is more gradual in women. As a result, the previous formula overestimates the peak heart rate younger women can achieve and underestimates the peak heart rate of older women.

Women in the age range of 40 to 89 years should expect their maximum heart rate to be 200 minus 67 percent of their age. In men, the formula is 216 minus 93 percent of their age. For women younger than 40, the relationship of heart rate to age may be different, as an insufficient number of tests on women younger than 40 were available to provide reliable results.

The study also showed that younger men have a lower resting heart rate and higher peak heart rate than women and that men's heart rates rise more dramatically during exercise and return to normal more quickly after stopping. The study did not investigate the physiological reasons behind the differences, although the researchers suggest hormones, especially testosterone, may play a role.

The previous formula was based on a study researchers now recognize as having serious limitations. For example, it included few women, a weakness common among older studies.

"It's logical that an equation developed 40 years ago based on a group that was predominantly men might not be accurate when applied to women today," Allison said. "But sometimes things just get stuck."

Changes since the 1970s in terms of average body weight, fitness levels and attitudes toward exercise particularly among women justify a re-evaluation of peak heart rate norms, Allison said. Other recent studies have offered updates to the formula, but this study uses a larger sample size and is the first to include data from both men and women.


Contact: Beth Casteel
American College of Cardiology

Related medicine news :

1. Witnessing, Experiencing Traumatic Events May Worsen Heart Disease
2. Risk of suicide and fatal heart attack immediately following a cancer diagnosis
3. Cancer Diagnosis May Raise Odds for Suicide, Heart Attack Death
4. In children born with severe heart defect, surgical management has little effect on neuro outcomes
5. Invasive heart test being dramatically overused, Stanford study shows
6. Heart failure patients with diabetes may benefit from higher glucose levels
7. Omega-3 Supplements No Help Against Repeat Heart Trouble: Review
8. EKG Heart Test May Predict Risk in Older Adults
9. Common Blood Pressure Drug Safe for Heart Failure: Study
10. Spouses of Cancer Patients May Have Raised Risk of Heart Disease, Stroke
11. SMART heart eases heart ache, targets cardiac patients emotional well-being
Post Your Comments:
(Date:12/1/2015)... (PRWEB) , ... December 02, 2015 , ... ... research “ Gastrointestinal events and association with initiation of treatment for osteoporosis ”. ... the use of pharmacological treatment in patients diagnosed with osteoporosis. Based on a ...
(Date:12/1/2015)... ... December 01, 2015 , ... ... its acquisition by Jordan Industries International, LLC (“JII”). , With support from JII, ... and maintenance services to hospitals, surgery centers, clinics, research labs and medical facilities ...
(Date:12/1/2015)... ... , ... According to an article published on November 16th by ... U.S. Department of Health and Human Services, claiming that any states which do not ... clause in the law prohibiting the denial of coverage for pre-existing conditions. The article ...
(Date:12/1/2015)... ... December 01, 2015 , ... Baptist Medical Center Jacksonville ... is the only hospital in the region providing what is known as the ... pacing patients were revealed recently at a medical conference and published in The ...
(Date:12/1/2015)... ... December 01, 2015 , ... Dr. Paul Vitenas, one of ... has been named by MedEsthetics magazine as the Best Single Physician Practice in the ... the many elite aesthetic physicians honored by the industry publication. , Dr. Vitenas ...
Breaking Medicine News(10 mins):
(Date:12/1/2015)... 01, 2015 ... the "Medium Molecular Weight Polyisobutylene Market ... Other Applications - Global Industry Analysis, Size, ... 2023" report to their offering. ... addition of the "Medium Molecular Weight ...
(Date:12/1/2015)... CLEVELAND , Dec. 1, 2015   ... innovation firm, today announced the publication of a ... Entering the Direct-to-Consumer Medical Market". The whitepaper gives ... roadmap for successfully penetrating this lucrative segment. ... purchase healthcare products to manage their own health, ...
(Date:12/1/2015)... 1, 2015 Array BioPharma Inc. ... its Chief Executive Officer, Ron Squarer ... Healthcare Conference in New York.  The public ... through a webcast on the Array BioPharma ... --> , ...
Breaking Medicine Technology: