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Physical activity assessed by activity monitor and doubly labeled water in children.
Med Sci Sports Exerc 2001; 33(2):275-81MS

Abstract

PURPOSE

To validate the Computer Science and Application's (CSA) activity monitor for assessment of the total amount of physical activity during two school-weeks in 9-yr-old children and to develop equations to predict total energy expenditure (TEE) and activity energy expenditure (AEE) from activity counts and anthropometric variables.

METHODS

A total of 26 children (15 boys and 11 girls, mean age 9.1 +/- 0.3 yr) were monitored for 14 consecutive days. TEE was simultaneously measured by the doubly labeled water method. Averaged activity counts (counts.min(-1)) were compared with data on: 1) TEE, 2) AEE = TEE minus basal metabolic rate (BMR; estimated from predictive equations), and 3) daily physical activity level (PAL = TEE/BMR).

RESULTS

Physical activity determined by activity counts was significantly related to the data on energy expenditures: TEE (r = 0.39; P < 0.05), AEE (r = 0.54; P < 0.01), and PAL (r = 0.58; P < 0.01). Multiple stepwise regression analysis showed that TEE was significantly influenced by gender, body composition (body weight or fat free mass), and activity counts (R(2) = 0.54--0.60). AEE was significantly influenced by activity counts and gender (R(2) = 0.45). There were no significant differences between activity counts and PAL in discriminating among activity levels with "low" (PAL < 1.56), "moderate" (1.57 < or = PAL > or = 1.81), and "high" (PAL > 1.81) intensity.

CONCLUSION

Activity counts from the CSA activity monitor seems to be a useful measure of the total amount of physical activity in 9-yr-old children. Activity counts contributed significantly to the explained variation in TEE and was the best predictor of AEE.

Authors+Show Affiliations

Unit for Preventive Nutrition, Department of Medical Nutrition, Karolinska Institutet, Stockholm, Sweden. ulf.eklund@ioh.oru.seNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11224818

Citation

Ekelund, U, et al. "Physical Activity Assessed By Activity Monitor and Doubly Labeled Water in Children." Medicine and Science in Sports and Exercise, vol. 33, no. 2, 2001, pp. 275-81.
Ekelund U, Sjöström M, Yngve A, et al. Physical activity assessed by activity monitor and doubly labeled water in children. Med Sci Sports Exerc. 2001;33(2):275-81.
Ekelund, U., Sjöström, M., Yngve, A., Poortvliet, E., Nilsson, A., Froberg, K., ... Westerterp, K. (2001). Physical activity assessed by activity monitor and doubly labeled water in children. Medicine and Science in Sports and Exercise, 33(2), pp. 275-81.
Ekelund U, et al. Physical Activity Assessed By Activity Monitor and Doubly Labeled Water in Children. Med Sci Sports Exerc. 2001;33(2):275-81. PubMed PMID: 11224818.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Physical activity assessed by activity monitor and doubly labeled water in children. AU - Ekelund,U, AU - Sjöström,M, AU - Yngve,A, AU - Poortvliet,E, AU - Nilsson,A, AU - Froberg,K, AU - Wedderkopp,N, AU - Westerterp,K, PY - 2001/2/27/pubmed PY - 2001/5/22/medline PY - 2001/2/27/entrez SP - 275 EP - 81 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 33 IS - 2 N2 - PURPOSE: To validate the Computer Science and Application's (CSA) activity monitor for assessment of the total amount of physical activity during two school-weeks in 9-yr-old children and to develop equations to predict total energy expenditure (TEE) and activity energy expenditure (AEE) from activity counts and anthropometric variables. METHODS: A total of 26 children (15 boys and 11 girls, mean age 9.1 +/- 0.3 yr) were monitored for 14 consecutive days. TEE was simultaneously measured by the doubly labeled water method. Averaged activity counts (counts.min(-1)) were compared with data on: 1) TEE, 2) AEE = TEE minus basal metabolic rate (BMR; estimated from predictive equations), and 3) daily physical activity level (PAL = TEE/BMR). RESULTS: Physical activity determined by activity counts was significantly related to the data on energy expenditures: TEE (r = 0.39; P < 0.05), AEE (r = 0.54; P < 0.01), and PAL (r = 0.58; P < 0.01). Multiple stepwise regression analysis showed that TEE was significantly influenced by gender, body composition (body weight or fat free mass), and activity counts (R(2) = 0.54--0.60). AEE was significantly influenced by activity counts and gender (R(2) = 0.45). There were no significant differences between activity counts and PAL in discriminating among activity levels with "low" (PAL < 1.56), "moderate" (1.57 < or = PAL > or = 1.81), and "high" (PAL > 1.81) intensity. CONCLUSION: Activity counts from the CSA activity monitor seems to be a useful measure of the total amount of physical activity in 9-yr-old children. Activity counts contributed significantly to the explained variation in TEE and was the best predictor of AEE. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/11224818/Physical_activity_assessed_by_activity_monitor_and_doubly_labeled_water_in_children_ L2 - http://dx.doi.org/10.1097/00005768-200102000-00017 DB - PRIME DP - Unbound Medicine ER -