Examining the validity of the ActivPAL monitor in measuring posture and ambulatory movement in childrenReport as inadecuate




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International Journal of Behavioral Nutrition and Physical Activity

, 9:119

First Online: 02 October 2012Received: 10 February 2012Accepted: 28 September 2012

Abstract

BackgroundDecreasing sedentary activities that involve prolonged sitting may be an important strategy to reduce obesity and other physical and psychosocial health problems in children. The first step to understanding the effect of sedentary activities on children’s health is to objectively assess these activities with a valid measurement tool.

PurposeTo examine the validity of the ActivPAL monitor in measuring sitting-lying, standing, and walking time, transition counts and step counts in children in a laboratory setting.

MethodsTwenty five healthy elementary school children age 9.9 ± 0.3 years; BMI 18.2 ± 1.9; mean ± SD were randomly recruited across the Auckland region, New Zealand. Children were fitted with ActivPAL monitors and observed during simulated free-living activities involving sitting-lying, standing and walking, followed by treadmill and over-ground activities at various speeds slow, normal, fast against video observation criterion measure. The ActivPAL sit-to-stand and stand-to-sit transition counts and steps were also compared with video data. The accuracy of step counts measured by the ActivPAL was also compared against the New Lifestyles NL-2000 and the Yamax Digi-Walker SW-200 pedometers.

ResultsWe observed a perfect correlation between the ActivPAL monitor in time spent sitting-lying, standing, and walking in simulated free-living activities with direct observation. Correlations between the ActivPAL and video observation in total numbers of sit-to-stand and stand-to-sit transitions were high r = 0.99 ± 0.01. Unlike pedometers, the ActivPAL did not misclassify fidgeting as steps taken. Strong correlations r = 0.88-1.00 between ActivPAL step counts and video observation in both treadmill and over-ground slow and normal walking were also observed. During treadmill and over-ground fast walking and running, the correlations were low r = 0.21-0.46.

ConclusionThe ActivPAL monitor is a valid measurement tool for assessing time spent sitting-lying, standing, and walking, sit-to-stand and stand-to-sit transition counts and step counts in slow and normal walking. The device did not measure accurately steps taken during treadmill and over-ground fast walking and running in children.

KeywordsChildren Physical activity Measurement Treadmill Sitting ActivPAL AbbreviationsBMIBody mass index

METsMetabolic equivalent units

NEATNon-exercise activity thermogenesis

CPMCounts per minute.

Electronic supplementary materialThe online version of this article doi:10.1186-1479-5868-9-119 contains supplementary material, which is available to authorized users.

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Author: Saeideh Aminian - Erica A Hinckson

Source: https://link.springer.com/



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