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Br J Sports Med. 2006 Sep;40(9):779-84. Epub 2006 Jul 6.

The validity and reliability of a novel activity monitor as a measure of walking.

Author information

  • 1School of Health and Social Care, Glasgow Caledonian University, Glasgow, Scotland, UK. cormac.ryan@gcal.ac.uk

Abstract

BACKGROUND:

The accurate measurement of physical activity is crucial to understanding the relationship between physical activity and disease prevention and treatment.

OBJECTIVE:

The primary purpose of this study was to investigate the validity and reliability of the activPAL physical activity monitor in measuring step number and cadence.

METHODS:

The ability of the activPAL monitor to measure step number and cadence in 20 healthy adults (age 34.5+/-6.9 years; BMI 26.8+/-4.8 (mean+/-SD)) was evaluated against video observation. Concurrently, the accuracy of two commonly used pedometers, the Yamax Digi-Walker SW-200 and the Omron HJ-109-E, was compared to observation for measuring step number. Participants walked on a treadmill at five different speeds (0.90, 1.12, 1.33, 1.56, and 1.78 m/s) and outdoors at three self selected speeds (slow, normal, and fast).

RESULTS:

At all speeds, inter device reliability was excellent for the activPAL (ICC (2,1)> or =0.99) for both step number and cadence. The absolute percentage error for the activPAL was <1.11% for step number and cadence regardless of walking speed. The accuracy of the pedometers was adversely affected by slow walking speeds.

CONCLUSION:

The activPAL monitor is a valid and reliable measure of walking in healthy adults. Its accuracy is not influenced by walking speed. The activPAL may be a useful device in sports medicine.

PMID:
16825270
[PubMed - indexed for MEDLINE]
PMCID:
PMC2564393
Free PMC Article
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