Validity and reliability of the Omron HJ-303 tri-axial accelerometer-based pedometer

Area of Science:

• Biomechanics
• Wearable Technology
• Exercise Physiology

Background:

• Pedometer accuracy is crucial for health monitoring.
• Previous studies show variability in pedometer performance.
• The Omron HJ-303 is a new piezoelectric model requiring validation.

Purpose of the Study:

• To compare the validity of the Omron HJ-303 pedometer against two other models (Sportline Traq, Yamax SW200).
• To assess pedometer accuracy across various speeds and lifestyle activities.
• To evaluate device reliability through repeated step trials.

Main Methods:

• Sixty subjects walked at 2-4 mph and performed lifestyle activities (stepping, elliptical, stairs).
• Twenty subjects ran at 6-8 mph; twenty performed ballroom dancing.
• Sixty participants completed 100-step trials to assess reliability; actual steps were hand-tallied.

Main Results:

• The Omron HJ-303 was the most valid for walking and several lifestyle activities (elliptical, stair climbing/descending).
• Sportline overestimated steps, while Yamax underestimated them during walking.
• Omron and Sportline were valid for running; Omron and Yamax showed reliability in 100-step trials.

Conclusions:

• The Omron HJ-303, particularly when worn at the waist, is the most valid pedometer among those tested.
• This device offers reliable step-counting for walking and various common physical activities.
• Findings support the Omron HJ-303 for accurate personal activity monitoring.