Pedometer accuracy during stair climbing and bench stepping exercises.

Area of Science:

• Biomechanics
• Wearable Technology

Background:

• Pedometer use is common for tracking physical activity, but accuracy during activities like stair climbing requires validation.
• Stair climbing and bench stepping involve vertical displacement and varied stepping rates, posing challenges for step-counting devices.

Purpose of the Study:

• To evaluate the accuracy of three commercial pedometers (DW-800, YM, HJ-700IT; OM, Lifecorder; KZ) during stair climbing and bench stepping exercises.
• To determine the influence of stepping rate and platform height on pedometer accuracy.

Main Methods:

• Ten healthy men performed stair climbing/descending and bench stepping exercises (10, 20, 30 cm platforms) wearing three pedometers.
• Stepping rates were controlled at 40, 50, 80, 100, and 120 steps per minute.

Main Results:

• Pedometer scores underestimated actual steps at slower rates and lower platform heights.
• At 80-120 steps/min and 20-30 cm platforms, measurement errors were -3.8 ± 10.8% (KZ), -2.1 ± 9.8% (YM), and -11.0 ± 18.9% (OM).
• KZ and YM pedometers demonstrated acceptable accuracy under specific conditions.

Conclusions:

• The KZ and YM pedometers can accurately assess step counts during stair climbing with 20-30 cm platforms at 80-120 steps/min.
• Pedometer accuracy is acceptable for stair climbing at ≥80 steps/min and ≥18 cm height, within a defined error range.