Accelerometer steps/day translation of moderate-to-vigorous activity

Prev Med. 2011 Jul-Aug;53(1-2):31-3. doi: 10.1016/j.ypmed.2011.01.014. Epub 2011 Feb 2.

Abstract

Physical activity (PA) guidelines are typically communicated in terms of duration, frequency and intensity, e.g., 30 min/day of moderate-to-vigorous physical activity (MVPA) on at least 5 days/week. Step counters can be used to collect objective PA expressed as steps/day, however the association between steps/day and recommended PA levels is unclear.

Objective: We determined a direct steps/day translation of 30 min/day accumulated MVPA, using concurrently detected ActiGraph accelerometer-defined step and activity count data collected as part of the 2005-2006 National Health and Nutrition Examination Survey (NHANES).

Method: We employed statistical models to analyze data from 3523 participants 20+years of age who wore the accelerometer for at least one valid day (i.e., at least 10/24h) over 7 days.

Results: 30 min/day of MVPA translated to approximately 7900 steps/day for males and 8300 steps/day for females. In a subsample of participants (n=1197) with valid data on all 7 days, we found 150 min/week of MVPA translated to approximately 7000 steps/day (or 49,000 steps/week).

Conclusion: Accumulating approximately 8000 steps/day is a good proxy for 30 min of daily MVPA, while accumulating 7000 steps/day every day of the week is consistent with obtaining 150 min of weekly MVPA.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Actigraphy / methods*
  • Actigraphy / statistics & numerical data*
  • Adult
  • Aged
  • Aged, 80 and over
  • Exercise
  • Female
  • Guidelines as Topic
  • Humans
  • Male
  • Middle Aged
  • Nutrition Surveys
  • Sex Distribution
  • Time
  • Walking / statistics & numerical data*
  • Young Adult