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Variability in physical activity patterns as measured by the SenseWear Armband: how many days are needed?

Tineke Scheers, Renaat Philippaerts UGent and Johan Lefevre (2012) EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 112(5). p.1653-1662
abstract
To examine sources of variance in objectively measured physical activity and to determine the number of monitoring days needed to quantify physical activity patterns reliably, 394 Flemish adults (41.1 +/- A 9.9 years) were monitored during 7 days, using the SenseWear Armband. Differences between weekdays, Saturday and Sunday were examined with repeated measures ANOVA's. Variance components were estimated for subject, weekday and residual error using data from Mondays through Fridays and used to calculate the reliability of 1-5 monitoring weekdays. Saturday was more and Sunday less active than an average weekday. Inter-individual variability was the largest source of variance (54.4-67.9%) for physical activity level (PAL), energy expenditure, inactivity, light, moderate and total physical activity. Intra-individual variability accounted for 31.8-44.8% and weekday for 0.1-1.1% of total variance. Intra-individual variability was the largest source of variance for vigorous activity in both sexes and steps in women. At least, 3 monitoring weekdays were required to achieve a reliability of 0.80 for PAL, energy expenditure, inactivity, light, moderate and total physical activity. All 5 weekdays should be monitored to reach acceptable reliability for steps. Five weekdays resulted in a reliability of 0.58-0.60 for vigorous activity. Both Saturday and Sunday and at least 3 weekdays need to be monitored to obtain reliable measures of habitual physical activity.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
POPULATION, VARIANCE, RELIABILITY, ACCELEROMETER, EXERCISE, GENERALIZABILITY THEORY, INTRAINDIVIDUAL VARIABILITY, UNITED-STATES, ENERGY-EXPENDITURE, FREE-LIVING ADULTS, Assessment, Objective monitoring, Reliability, Intra-individual variance, Inter-individual variance
journal title
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Eur. J. Appl. Physiol.
volume
112
issue
5
pages
1653 - 1662
Web of Science type
Article
Web of Science id
000302745700008
JCR category
SPORT SCIENCES
JCR impact factor
2.66 (2012)
JCR rank
12/84 (2012)
JCR quartile
1 (2012)
ISSN
1439-6319
DOI
10.1007/s00421-011-2131-9
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2917462
handle
http://hdl.handle.net/1854/LU-2917462
date created
2012-06-25 09:25:19
date last changed
2015-06-17 10:08:58
@article{2917462,
  abstract     = {To examine sources of variance in objectively measured physical activity and to determine the number of monitoring days needed to quantify physical activity patterns reliably, 394 Flemish adults (41.1 +/- A 9.9 years) were monitored during 7 days, using the SenseWear Armband. Differences between weekdays, Saturday and Sunday were examined with repeated measures ANOVA's. Variance components were estimated for subject, weekday and residual error using data from Mondays through Fridays and used to calculate the reliability of 1-5 monitoring weekdays. Saturday was more and Sunday less active than an average weekday. Inter-individual variability was the largest source of variance (54.4-67.9\%) for physical activity level (PAL), energy expenditure, inactivity, light, moderate and total physical activity. Intra-individual variability accounted for 31.8-44.8\% and weekday for 0.1-1.1\% of total variance. Intra-individual variability was the largest source of variance for vigorous activity in both sexes and steps in women. At least, 3 monitoring weekdays were required to achieve a reliability of 0.80 for PAL, energy expenditure, inactivity, light, moderate and total physical activity. All 5 weekdays should be monitored to reach acceptable reliability for steps. Five weekdays resulted in a reliability of 0.58-0.60 for vigorous activity. Both Saturday and Sunday and at least 3 weekdays need to be monitored to obtain reliable measures of habitual physical activity.},
  author       = {Scheers, Tineke and Philippaerts, Renaat and Lefevre, Johan},
  issn         = {1439-6319},
  journal      = {EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY},
  keyword      = {POPULATION,VARIANCE,RELIABILITY,ACCELEROMETER,EXERCISE,GENERALIZABILITY THEORY,INTRAINDIVIDUAL VARIABILITY,UNITED-STATES,ENERGY-EXPENDITURE,FREE-LIVING ADULTS,Assessment,Objective monitoring,Reliability,Intra-individual variance,Inter-individual variance},
  language     = {eng},
  number       = {5},
  pages        = {1653--1662},
  title        = {Variability in physical activity patterns as measured by the SenseWear Armband: how many days are needed?},
  url          = {http://dx.doi.org/10.1007/s00421-011-2131-9},
  volume       = {112},
  year         = {2012},
}

Chicago
Scheers, Tineke, Renaat Philippaerts, and Johan Lefevre. 2012. “Variability in Physical Activity Patterns as Measured by the SenseWear Armband: How Many Days Are Needed?” European Journal of Applied Physiology 112 (5): 1653–1662.
APA
Scheers, T., Philippaerts, R., & Lefevre, J. (2012). Variability in physical activity patterns as measured by the SenseWear Armband: how many days are needed? EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 112(5), 1653–1662.
Vancouver
1.
Scheers T, Philippaerts R, Lefevre J. Variability in physical activity patterns as measured by the SenseWear Armband: how many days are needed? EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 2012;112(5):1653–62.
MLA
Scheers, Tineke, Renaat Philippaerts, and Johan Lefevre. “Variability in Physical Activity Patterns as Measured by the SenseWear Armband: How Many Days Are Needed?” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY 112.5 (2012): 1653–1662. Print.