Comparison of older adults' Steps per day using an NL-1000 pedometer and two GT3X+ accelerometer Filters

Tiago V. Barreira, Robert M. Brouillette, Heather C. Foil, Jeffrey N. Keller, Catrine Tudor-Locke

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


The purpose of this study was to compare the steps/d derived from the ActiGraph GT3X+ using the manufacturer's default filter (DF) and low-frequency-extension filter (LFX) with those from the NL-1000 pedometer in an older adult sample. Fifteen older adults (61-82 yr) wore a GT3X+ (24 hr/day) and an NL-1000 (waking hours) for 7 d. Day was the unit of analysis (n = 86 valid days) comparing (a) GT3X+ DF and NL-1000 steps/d and (b) GT3X+ LFX and NL-1000 steps/d. DF was highly correlated with NL-1000 (r =.80), but there was a significant mean difference (-769 steps/d). LFX and NL-1000 were highly correlated (r =.90), but there also was a significant mean difference (8,140 steps/d). Percent difference and absolute percent difference between DF and NL-1000 were -7.4% and 16.0%, respectively, and for LFX and NL-1000 both were 121.9%. Regardless of filter used, GT3X+ did not provide comparable pedometer estimates of steps/d in this older adult sample.

Original languageEnglish (US)
Pages (from-to)402-416
Number of pages15
JournalJournal of Aging and Physical Activity
Issue number4
StatePublished - Oct 2013
Externally publishedYes


  • Accelerometry
  • Measurement
  • Physical activity
  • Step counts
  • Validity

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Gerontology
  • Geriatrics and Gerontology

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