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Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

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Published on: June 20, 2025

The Physical Activity Guidelines for Americans.

Katrina L Piercy¹, Richard P Troiano², Rachel M Ballard³

¹Office of Disease Prevention and Health Promotion, US Department of Health and Human Services, Rockville, Maryland.

|November 13, 2018

Summary

This summary is machine-generated.

Physical activity is crucial for health, yet most Americans are inactive. The Physical Activity Guidelines for Americans, 2nd edition, offer recommendations for all ages to improve well-being and reduce disease risk.

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Area of Science:

Public Health
Exercise Science
Preventive Medicine

Background:

A significant portion of US adults and adolescents (approximately 80%) do not meet recommended physical activity levels.
Physical activity is essential for normal growth, development, improved mood, function, sleep, and chronic disease risk reduction.

Purpose of the Study:

To summarize the key recommendations from the Physical Activity Guidelines for Americans, 2nd edition.
To provide evidence-based guidance on physical activity for diverse population groups.

Main Methods:

A systematic review of scientific literature was conducted by the 2018 Physical Activity Guidelines Advisory Committee.
Evidence was graded based on consistency and quality, with strong or moderate evidence forming the basis of the guidelines.
The Department of Health and Human Services (HHS) developed the guidelines based on the committee's scientific report.

Main Results:

Specific daily and weekly physical activity targets are outlined for children, adolescents, adults, older adults, pregnant/postpartum women, and adults with chronic conditions.
Recommendations include aerobic activity (moderate-to-vigorous intensity) and muscle-strengthening activities.
Multicomponent physical activity, including balance training, is advised for older adults.

Conclusions:

The guidelines emphasize that increasing physical activity and reducing sedentary time benefits nearly everyone.
Even modest increases in activity yield significant health benefits, with greater benefits from more activity.
Health professionals and policymakers should promote these guidelines to improve public health.