title: Validity and reliability of the Omron HJ-303 tri-axial accelerometer-based pedometer.
abstract: BACKGROUND
  This study compared the validity of a new Omron HJ-303 piezoelectric pedometer and 2 other pedometers (Sportline Traq and Yamax SW200).
  
  
  METHODS
  To examine the effect of speed, 60 subjects walked on a treadmill at 2, 3, and 4 mph. Twenty subjects also ran at 6, 7, and 8 mph. To test lifestyle activities, 60 subjects performed front-back-side-side stepping, elliptical machine and stair climbing/descending. Twenty others performed ballroom dancing. Sixty participants completed 5 100-step trials while wearing 5 different sets of the devices tested device reliability. Actual steps were determined using a hand tally counter.
  
  
  RESULTS
  Significant differences existed among pedometers (P < .05). For walking, the Omron pedometers were the most valid. The Sportline overestimated and the Yamax underestimated steps (P < .05). Worn on the waist or in the backpack, the Omron device and Sportline were valid for running. The Omron was valid for 3 activities (elliptical machine, ascending and descending stairs). The Sportline overestimated all of these activities, and Yamax was only valid for descending stairs. The Omron andYamax were both valid and reliable in the 100-step trials.
  
  
  CONCLUSIONS
  The Omron HJ-303, worn on the waist, appeared to be the most valid of the 3 pedometers.
authors: Dept of Exercise, Sport, and Leisure Studies, University of Tennessee, Knoxville, TN, USA.
authors: Jeremy A
authors: JA
authors: Steeves
authors: Brian M
authors: BM
authors: Tyo
authors: Christopher P
authors: CP
authors: Connolly
authors: Douglas A
authors: DA
authors: Gregory
authors: Nyle A
authors: NA
authors: Stark
authors: David R
authors: DR
authors: Bassett
mesh_terms: D000328:Adult; D001837:Body Weights and Measures; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D015203:Reproducibility of Results; D012420:Running; D016138:Walking