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Sedentary Behavior in U.S. Adults: Fall 2019.

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Medicine and Science in Sports and Exercise
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Summary
This summary is machine-generated.

U.S. adults spend more sedentary time than previously estimated, accumulating most of it during leisure and work. Reducing leisure screen time may be key to increasing physical activity.

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Area of Science:

  • Public Health
  • Epidemiology
  • Behavioral Science

Background:

  • Sedentary behavior is linked to increased mortality risk.
  • The precise distribution of sedentary time across different activities and demographics in U.S. adults is not well understood.
  • Accurate quantification of sedentary time is crucial for public health interventions.

Purpose of the Study:

  • To quantify the total amount of sedentary time in U.S. adults.
  • To identify the primary sources and behavioral contexts of sedentary time.
  • To compare a novel recall method with a standard surveillance question for measuring sitting time.

Main Methods:

  • A nationwide survey of 2,640 U.S. adults aged 20-75 years was conducted.
  • A validated previous-day recall method (ACT24) was used to assess sedentary time over 24 hours.
  • Survey data were weighted to represent the U.S. population.

Main Results:

  • U.S. adults reported an average of 9.5 hours per day of sedentary time, 34% higher than estimates from common surveillance measures.
  • Leisure activities accounted for 47% of total sedentary time (4.3 hours/day), with television/video watching and internet/computer use being primary contributors.
  • Eighty-two percent of leisure time was spent sedentary.

Conclusions:

  • U.S. adults engage in significantly more sedentary behavior than previously reported.
  • Sedentary time is predominantly accumulated during leisure and work.
  • Interventions targeting the reduction of sedentary screen time during leisure could be effective in promoting physical activity.