Abstract
Purpose: The study compares MET-defined cutpoints used to classify sedentary behaviors in children using a simulated free-living design. Methods: A sample of 102 children (54 boys and 48 girls; 7–13 years) completed a set of 12 activities (randomly selected from a pool of 24 activities) in a random order. Activities were predetermined and ranged from sedentary to vigorous intensities. Participant’s energy expenditure was measured using a portable indirect calorimetry system, Oxycon mobile. Measured minute-by-minute VO2 values (i.e., ml/kg/min) were converted to an adult- or child-MET value using the standard 3.5 ml/kg/min or the estimated child resting metabolic rate, respectively. Classification agreement was examined for both the “standard” (1.5 adult-METs) and an “adjusted” (2.0 adult-METs) MET-derived threshold for classifying sedentary behavior. Alternatively, we also tested the classification accuracy of a 1.5 child-MET threshold. Classification accuracy of sedentary activities was evaluated relative to the predetermined intensity categorization using receiver operator characteristic curves. Results: There were clear improvements in the classification accuracy for sedentary activities when a threshold of 2.0 adult-METs was used instead of 1.5 METs (Se1.5 METs = 4.7 %, Sp1.5 METs = 100.0 %; Se2.0 METs = 36.9 %, Sp2.0 METs = 100.0 %). The use of child-METs while maintaining the 1.5 threshold also resulted in improvements in classification (Se = 45.1 %, Sp = 100.0 %). Conclusion: Adult-MET thresholds are not appropriate for children when classifying sedentary activities. Classification accuracy for identifying sedentary activities was improved when either an adult-MET of 2.0 or a child-MET of 1.5 was used.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 29-38 |
| Number of pages | 10 |
| Journal | European Journal of Applied Physiology |
| Volume | 116 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2016 |
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Keywords
- Measurement
- Public health
- Resting energy expenditure
- Youth
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health
- Orthopedics and Sports Medicine
- Physiology (medical)
Cite this
Kids are not little adults : what MET threshold captures sedentary behavior in children? / Saint-Maurice, Pedro F.; Kim, Youngwon; Welk, Gregory J.; Gaesser, Glenn.
In: European Journal of Applied Physiology, Vol. 116, No. 1, 01.01.2016, p. 29-38.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Kids are not little adults
T2 - what MET threshold captures sedentary behavior in children?
AU - Saint-Maurice, Pedro F.
AU - Kim, Youngwon
AU - Welk, Gregory J.
AU - Gaesser, Glenn
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Purpose: The study compares MET-defined cutpoints used to classify sedentary behaviors in children using a simulated free-living design. Methods: A sample of 102 children (54 boys and 48 girls; 7–13 years) completed a set of 12 activities (randomly selected from a pool of 24 activities) in a random order. Activities were predetermined and ranged from sedentary to vigorous intensities. Participant’s energy expenditure was measured using a portable indirect calorimetry system, Oxycon mobile. Measured minute-by-minute VO2 values (i.e., ml/kg/min) were converted to an adult- or child-MET value using the standard 3.5 ml/kg/min or the estimated child resting metabolic rate, respectively. Classification agreement was examined for both the “standard” (1.5 adult-METs) and an “adjusted” (2.0 adult-METs) MET-derived threshold for classifying sedentary behavior. Alternatively, we also tested the classification accuracy of a 1.5 child-MET threshold. Classification accuracy of sedentary activities was evaluated relative to the predetermined intensity categorization using receiver operator characteristic curves. Results: There were clear improvements in the classification accuracy for sedentary activities when a threshold of 2.0 adult-METs was used instead of 1.5 METs (Se1.5 METs = 4.7 %, Sp1.5 METs = 100.0 %; Se2.0 METs = 36.9 %, Sp2.0 METs = 100.0 %). The use of child-METs while maintaining the 1.5 threshold also resulted in improvements in classification (Se = 45.1 %, Sp = 100.0 %). Conclusion: Adult-MET thresholds are not appropriate for children when classifying sedentary activities. Classification accuracy for identifying sedentary activities was improved when either an adult-MET of 2.0 or a child-MET of 1.5 was used.
AB - Purpose: The study compares MET-defined cutpoints used to classify sedentary behaviors in children using a simulated free-living design. Methods: A sample of 102 children (54 boys and 48 girls; 7–13 years) completed a set of 12 activities (randomly selected from a pool of 24 activities) in a random order. Activities were predetermined and ranged from sedentary to vigorous intensities. Participant’s energy expenditure was measured using a portable indirect calorimetry system, Oxycon mobile. Measured minute-by-minute VO2 values (i.e., ml/kg/min) were converted to an adult- or child-MET value using the standard 3.5 ml/kg/min or the estimated child resting metabolic rate, respectively. Classification agreement was examined for both the “standard” (1.5 adult-METs) and an “adjusted” (2.0 adult-METs) MET-derived threshold for classifying sedentary behavior. Alternatively, we also tested the classification accuracy of a 1.5 child-MET threshold. Classification accuracy of sedentary activities was evaluated relative to the predetermined intensity categorization using receiver operator characteristic curves. Results: There were clear improvements in the classification accuracy for sedentary activities when a threshold of 2.0 adult-METs was used instead of 1.5 METs (Se1.5 METs = 4.7 %, Sp1.5 METs = 100.0 %; Se2.0 METs = 36.9 %, Sp2.0 METs = 100.0 %). The use of child-METs while maintaining the 1.5 threshold also resulted in improvements in classification (Se = 45.1 %, Sp = 100.0 %). Conclusion: Adult-MET thresholds are not appropriate for children when classifying sedentary activities. Classification accuracy for identifying sedentary activities was improved when either an adult-MET of 2.0 or a child-MET of 1.5 was used.
KW - Measurement
KW - Public health
KW - Resting energy expenditure
KW - Youth
UR - http://www.scopus.com/inward/record.url?scp=84952984949&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84952984949&partnerID=8YFLogxK
U2 - 10.1007/s00421-015-3238-1
DO - 10.1007/s00421-015-3238-1
M3 - Article
C2 - 26271677
AN - SCOPUS:84952984949
VL - 116
SP - 29
EP - 38
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
SN - 1439-6319
IS - 1
ER -