Sleep duration is now considered an essential component for ideal heart and brain health. Life's Essential 8™ cardiovascular health score replaces Life's Simple 7™, according to a new Presidential Advisory, Life's Essential 8 -- Updating and Enhancing the American Heart Association's Construct on Cardiovascular Health, published today in Circulation, the Association's flagship, peer-reviewed journal.
Other updates to the measures of optimal cardiovascular health, now for anyone ages 2 and older, include a new guide to assess diet; accounting for exposure to secondhand smoke and vaping; using non-HDL cholesterol instead of total cholesterol to measure blood lipids; and expanding the blood sugar measure to include hemoglobin A1c, a key measure to assess Type 2 diabetes risk.
Cardiovascular disease is the number one cause of death in the U.S. and globally. According to the Association's 2022 Heart Disease and Stroke Statistics Update, approximately 121.5 million people in the U.S. have high blood pressure, 100 million have obesity, more than 28 million people have Type 2 diabetes, and only 1 in 4 adults reported achieving the physical activity and exercise recommended in the U.S. Department of Health and Human Services' Physical Activity Guidelines for Americans, 2nd edition. Various research studies over the past two decades indicate more than 80% of all cardiovascular events may be prevented by healthy lifestyle and management of known cardiovascular risk factors.
"The new metric of sleep duration reflects the latest research findings: sleep impacts overall health, and people who have healthier sleep patterns manage health factors such as weight, blood pressure or risk for Type 2 diabetes more effectively," said American Heart Association President Donald M. Lloyd-Jones, M.D., Sc.M., FAHA, who led the advisory writing group and is chair of the department of preventive medicine, the Eileen M. Foell Professor of Heart Research and professor of preventive medicine, medicine and pediatrics at Northwestern University's Feinberg School of Medicine in Chicago. "In addition, advances in ways to measure sleep, such as with wearable devices, now offer people the ability to reliably and routinely monitor their sleep habits at home."
The Association first defined the 7 metrics for cardiovascular health in 2010 to identify the specific health behaviors and health factors that drive optimal heart and brain health. Brain health in relation to cardiovascular health was defined in a 2017 American Heart Association Presidential Advisory. It was further acknowledged as an important component of optimal cardiovascular health in the Association's January 2021 Scientific Statement on the mind-heart-body connection. Findings from both papers are incorporated into Life's Essential 8™.
After 12 years and more than 2,400 scientific papers on the topic, new discoveries in heart and brain health and in the ways to measure cardiovascular health provided an opportunity to revisit each health component in more detail. Four of the original metrics have been redefined for consistency with newer clinical guidelines or compatibility with new measurement tools. Also, the scoring system can now be applied to anyone ages 2 and older.
The Life's Essential 8™ components of optimal cardiovascular health are divided into two major areas -- health behaviors and health factors. Health behaviors include diet, physical activity, nicotine exposure and sleep. Health factors are body mass index, cholesterol levels, blood sugar and blood pressure. "The idea of optimal cardiovascular health is important because it gives people positive goals to work toward at any stage of life," said Lloyd-Jones.
"Life's Simple 7™ has served as a proven, powerful tool for understanding how to achieve healthy aging and ways to improve cardiovascular health while decreasing the risks of developing heart disease and stroke, as well as cancer, dementia and many other chronic diseases," he said. "Given the evolving research, it was important to address some limitations to the original metrics, particularly in ways they've been applied to people from diverse racial and ethnic populations."
Lloyd-Jones explained that some of the previous metrics, such as diet, were not as sensitive to differences among people, or as responsive to changes over time within a single individual. "We felt it was the right time to conduct a comprehensive review of the latest research to refine the existing metrics and consider any new metrics that add value to assessing cardiovascular health for all people."
Life's Essential 8™ includes:
Each component of Life's Essential 8™, which is assessed by the My Life Check tool, has an updated scoring system ranging from 0 to 100 points. The overall cardiovascular health score from 0 to 100 points is the average of the scores for each of the 8 health measures. Overall scores below 50 indicate "poor" cardiovascular health, and 50-79 is considered "moderate" cardiovascular health. Scores of 80 and above indicate "high" cardiovascular health. The advisory recommends measuring cholesterol, blood sugar, blood pressure, height and weight at least every five years for the most complete and accurate Life's Essential 8™ score.
The writing group also reviewed data about the impacts of stress, mental health and social determinants of health, such as access to health care, income or education level, and structural racism, which are critical to understanding the foundations of health, particularly among people from diverse racial and ethnic populations.
"We considered social determinants of health carefully in our update and determined more research is needed on these components to establish their measurement and inclusion in the future," said Lloyd-Jones. "Nonetheless, social and structural determinants, as well as psychological health and well-being, are critical, foundational factors in an individual's or a community's opportunity to preserve and improve cardiovascular health. We must consider and address all of these issues for people to have the opportunity for a full, healthy life as measured by Life's Essential 8™."
"Life's Essential 8™ is a major step forward in our ability to identify when cardiovascular health can be preserved and when it is sub-optimal. It should energize efforts to improve cardiovascular health for all people and at every life stage," Lloyd-Jones concluded.
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