J Nutr Health.  2015 Apr;48(2):180-191. 10.4163/jnh.2015.48.2.180.

Energy expenditure measurement of various physical activity and correlation analysis of body weight and energy expenditure in elementary school children

Affiliations
  • 1Department of Food and Nutrition, Gangneung-Wonju National University, Gangwon 210-702, Korea. ekkim@gwnu.ac.kr
  • 2National Academy of Agricultural Science, Rural Development Administration, Jeonbuk 560-500, Korea.

Abstract

PURPOSE
There is a lack of data on the energy cost of children's everyday activities, adult values are often used as surrogates. In addition, the influence of body weight on the energy cost of activity when expressed as metabolic equivalents (METs) has not been vigorously explored.
METHODS
In this study 20 elementary school students 9~12 years of age completed 18 various physical activities while energy expenditure was measured continuously using a portable telemetry gas exchange system (K4b2, Cosmed, Rome, Italy).
RESULTS
The average age was 10.4 years and the average height and weight was 145.1 cm and 43.6 kg, respectively. Oxygen consumption (VO2), energy expenditure and METs at the time of resting of the subjects were 5.41 mL/kg/min, 1.44 kcal/kg/h, and 1.5 METs, respectively. METs values by 18 physical activities were as follows: Homework and reading books (1.6 METs), playing game with a mobile phone or video while sitting (1.6 METs), watching TV while sitting on a comfortable chair (1.7 METs), playing video game or mobile phone game while standing (1.9 METs), sweeping a room with a broom (2.7 METs) and playing a board game (2.8 METs) belong to light intensity physical activities. By contrary, speedy walking and running were 6.6 and 6.7 METs, respectively, which belong to high intensity physical activities over 6.0 METs. When the effect of body weight on physical activity energy expenditure was determined, R2 values increased with 0.116 (playing a game at sitting), 0.176 (climbing up and down stairs), 0.246 (slow walking), and 0.455 (running), which showed that higher activity intensity increased explanation power of body weight on METs value.
CONCLUSION
This study is important for direct evaluation of energy expenditure by physical activities of children, and it could be used directly for revising and complementing the existing activity classification table to fit for children.

Keyword

children; physical activity; energy cost; Metabolic equivalents

MeSH Terms

Adult
Body Weight*
Cellular Phone
Child*
Classification
Complement System Proteins
Cytisus
Energy Metabolism*
Humans
Metabolic Equivalent
Motor Activity*
Oxygen Consumption
Running
Telemetry
Video Games
Walking
Complement System Proteins

Figure

  • Fig. 1 Bland-Altman plot (mean difference and limit of agreement) of measured child METs in this study and compendium adult METs (2011) and child METs (2008). Selected activities with the greatest discrepancies in METs are labeled (A: comparison with compendium adult, B: comparison with compendium child).

  • Fig. 2 Scatter plot of the relationship between body weight and the METs value of 18 activities. A simple linear regression was performed to determine the predictive capability (R2) of body weight for the METs value for each activity (A: video game, sitting, B: sweeping, C: stair climbing, D: shoveling, E: slow walking, F: running).


Cited by  1 articles

Energy expenditure of physical activity in Korean adults and assessment of accelerometer accuracy by gender
Yeon-jung Choi, Mun-jeong Ju, Jung-hye Park, Jong-hoon Park, Eun-kyung Kim
J Nutr Health. 2017;50(6):552-564.    doi: 10.4163/jnh.2017.50.6.552.


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