Between-monitor differences in step counts are related to body size

Implications for objective physical activity measurement

Jeremy Pomeroy, Søren Brage, Jeffrey M. Curtis, Pamela Swan, William C. Knowler, Paul W. Franks

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Background: The quantification of the relationships between walking and health requires that walking is measured accurately. We correlated different measures of step accumulation to body size, overall physical activity level, and glucose regulation. Methods: Participants were 25 men and 25 women American Indians without diabetes (Age: 20-34 years) in Phoenix, Arizona, USA. We assessed steps/day during 7 days of free living, simultaneously with three different monitors (Accusplit-AX120, MTI-ActiGraph, and Dynastream-AMP). We assessed total physical activity during free-living with doubly labeled water combined with resting metabolic rate measured by expired gas indirect calorimetry. Glucose tolerance was determined during an oral glucose tolerance test. Findings: Based on observed counts in the laboratory, the AMP was the most accurate device, followed by the MTI and the AX120, respectively. The estimated energy cost of 1000 steps per day was lower in the AX120 than the MTI or AMP. The correlation between AX120-assessed steps/day and waist circumference was significantly higher than the correlation between AMP steps and waist circumference. The difference in steps per day between the AX120 and both the AMP and the MTI were significantly related to waist circumference. Interpretation: Between-monitor differences in step counts influence the observed relationship between walking and obesity-related traits.

Original languageEnglish (US)
Article numbere18942
JournalPLoS One
Volume6
Issue number4
DOIs
StatePublished - 2011

Fingerprint

waist circumference
Body Size
Adenosine Monophosphate
physical activity
walking
body size
Exercise
Waist Circumference
monitoring
Walking
actigraphy
resting metabolic rate
Glucose
American Indians
calorimetry
energy costs
glucose tolerance
diabetes
obesity
Basal Metabolism

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Between-monitor differences in step counts are related to body size : Implications for objective physical activity measurement. / Pomeroy, Jeremy; Brage, Søren; Curtis, Jeffrey M.; Swan, Pamela; Knowler, William C.; Franks, Paul W.

In: PLoS One, Vol. 6, No. 4, e18942, 2011.

Research output: Contribution to journalArticle

Pomeroy, Jeremy ; Brage, Søren ; Curtis, Jeffrey M. ; Swan, Pamela ; Knowler, William C. ; Franks, Paul W. / Between-monitor differences in step counts are related to body size : Implications for objective physical activity measurement. In: PLoS One. 2011 ; Vol. 6, No. 4.
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