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Normative steps/day values for older adults: NHANES 2005-2006
Catrine Tudor-Locke1, John M Schuna, Tiago V Barreira
1FACSM, Director, Walking Behavior Laboratory, Preventive Medicine and Healthy Aging, Pennington Biomedical Research Center, Baton Rouge, LA 70808. Tudor-Locke@pbrc.edu.
Summary
This study provides sex- and age-specific daily step counts for older adults, adjusted for pedometer use. Findings reveal a general decrease in steps with age, offering valuable insights for public health initiatives.
Area of Science:
- Gerontology
- Physical Activity Measurement
- Public Health
Background:
- Pedometers are widely adopted for walking interventions and by the general public.
- Accelerometers offer objective physical activity data but require adjustment for pedometer-based interpretation.
- Establishing normative step data is crucial for evaluating walking interventions in older adults.
Purpose of the Study:
- To present sex- and age-specific normative values for accelerometer-determined steps per day.
- To adjust accelerometer data to a pedometer-based scale for broader applicability.
- To provide reference data for older adults' daily physical activity levels.
Main Methods:
- Utilized accelerometer data from 1,196 older adults (60+ years) from the 2005-2006 National Health and Nutrition Examination Survey.
- Adjusted accelerometer counts to a pedometer scale by censoring low-activity minutes.
- Computed quintile-defined categories and smoothed percentile curves for steps/day across sex and age groups.
Main Results:
- Normative step data revealed significant variation, with men aged 65-69 having the highest category (>9,126 steps/day) and women aged 85+ the lowest (<276 steps/day).
- A general trend of decreasing steps per day was observed with increasing age within each category.
- Smoothed percentile curves from LMSChartmakerPro corroborated these age-related patterns.
Conclusions:
- This study offers the first detailed population distribution of normative accelerometer-determined steps/day, adjusted to a pedometer scale.
- These normative values are valuable for clinical and public health applications, particularly those utilizing pedometer-based interventions.
- The findings highlight the importance of age and sex in interpreting daily physical activity levels in older adults.
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