Physical Activity Assessment of Preschool Children Using Accelerometer - Including Comparison of Reintegrating Counts of Different Epoch Lengths -

가속도계를 이용한 미취학아동의 신체활동 평가 - 자료요약주기의 재통합 측정치와의 비교를 포함하여 -

  • Received : 2016.07.15
  • Accepted : 2016.07.25
  • Published : 2016.08.02


The purpose of this study was to assess the physical activity of preschool children using an accelerometer and investigate differences related to epoch length setting during use of the accelerometer. Subjects of the study were 26 children (12 boys and 14 girls) at the age of 5, enrolled in one preschool located in Gangneung. From 9:00 a.m. to 4:00 p.m. (7 hours period), every child wore a total of four accelerometers (ActiGraph $GT3X^+$, USA), including three attached to the left hip (with epoch length set at 5 seconds, 15 seconds, and 30 seconds). For comparison purposes, a forth was attached to the opposite position, with epoch length set at 5 seconds. Data collected using 15s epoch and 30s epoch (single larger epoch) were compared with those obtained after reintegration of 5s to 15s epoch, 5s to 30s epoch, and 15s to 30s epoch, respectively (smaller epochs reintegrated). According to the results of this study, there were no significant differences in VM between 30s epoch and 5s to 30s epoch reintegrated and in MVPA (moderate-to-vigorous physical activity), between 15s epoch and 5s to 15s epoch reintegrated. From the Bland-Altman plot, reintegration of 15s to 30s epoch in VM and reintegrations of 15s to 30s epoch and 5s to 15s epoch in MVPA can be recommended for assessing physical activity in preschool children. Further research is needed into the reintegration method while using an accelerometer for assessment of energy expenditure in children.


physical activity;preschool children;accelerometer;actigraph;reintegration


  1. Aadland E, Ylvisaker E (2015): Reliability of the actigraph $GT3X^+$ accelerometer in adults under free-living conditions. PLoS One 10(8):e0134606
  2. Ahan H J, L ee MC, L ee DT ( 2006): Validity and energy expenditure of physical activity estimated by accelerometer. Int J Coach Sci 8(4):69-77
  3. Baek S (2008): The effect of physical activity on children's obesity. Korean J Obes 17(2):55-64
  4. Baker JL, Olsen LW, Sorensen TI (2007): Childhood body-mass index and the risk of coronary heart disease in adulthood. N Engl J Med 357(23):2329-2337
  5. Cliff DP, Reilly JJ, Okely AD (2009): Methodological considerations in using accelerometers to assess habitual physical activity in children aged 0-5 years. J Sci Med Sport 12(5):557-567
  6. Freedson P, Pober D, Janz KF (2005): Calibration of accelerometer output for children. Med Sci Sports Exerc 37(11 Suppl):S523-S530
  7. Freedson PS, Melanson E, Sirard J (1998): Calibration of the computer science and applications, Inc. accelerometer. Med Sci Sports Exerc 30:777-781
  8. Jeong WS, Lee HS, Park UI (2003): Wearing, dietary and psychological characteristics of obese children. J Korean Home Econ Assoc. Fam Environ Res 41(1):155-167
  9. Joung HJ, Lee MH, Choi YS, Cho SH (2000): Baseline dietary behaviors of children for nutritional management programs at child care center in Korea. Korean J Nutr 33(8):890-900
  10. Kim EK, Song JM, Choi HJ, Lee GH (2006): Assessment of activity coefficient, resting energy expenditure and daily energy expenditure in elementary school children. J Korean Diet Assoc 12(1):44-54
  11. Kim HS, Ma YM, Park JY, Kim SH (2013a): An emotional self-regulation program for obese children: pilot study using mixed methods. Child Health Nurs Res 19(3):187-197
  12. Kim JH, Kim EK (2009): Assessment of physical activity, activity coefficient of preschool children and actual condition of daycare center outdoor play. Korean J Community Nutr 14(6):777-788
  13. Kim Y, Beets MW, Pate RR, Blair SN (2013b): The effect of reintegrating Actigraph accelerometer counts in preschool children: comparison using different epoch lengths. J Sci Med Sport 16(2):129-134
  14. Kim YK, Chyun JH (2001): Nutrition intakes and relations to the obesity a nd t he p reval ence o f anemia i n preschool c hildren living in metropolitan area of Korea. J Korean Soc Food Cult 16(5):451-462
  15. Kim YS, Lee HM, Kim JH (2015): Sodium-related eating behaviors of parents and its relationship to eating behaviors of their preschool children. Korean J Community Nutr 20(1):11-20
  16. Lee MH (2014): Accuracy of accelerometer cut-points for estimating physical activity intensity for children. Korean J Meas Eval Phys Edu Sport Sci 16(2):13-26
  17. Lee MY (2011): Validity evidences and validation procedure of objective physical activity measures. Korean J Meas Eval Phys Edu Sport Sci 13(2):17-37
  18. McClain JJ, Abraham TL, Brusseau TA Jr, Tudor-Locke C (2008): Epoch length and accelerometer outputs in children: comparison to direct observation. Med Sci Sports Exerc 40(12):2080-2087
  19. Ministry of Health and Welfare (2015): Dietary reference intakes for Koreans. Ministry of Health and Welfare. Sejong. pp.46-48.
  20. Nilsson A, Ekelund U, Yngve A, Sjostrom M (2002): Assessing physical activity among children with accelerometers using different time sampling intervals and placements. Pediatr Exerc Sci 14(1):87-96
  21. Park H S, S hin KO ( 2004): Hair zinc and lead: relationship to nutrient intake and height and body weight in Korean preschool children. Korean J Nutr 37(3):193-201
  22. Puder JJ, Munsch S (2010): Psychological correlates of childhood obesity. Int J Obes (Lond) 34:S37-S43
  23. Puyau MR, Adolph AL, Vohra FA, Butte NF (2002): Validation and calibration of physical activity monitors in children. Obes Res 10(3):150-157
  24. Reilly JJ, Penpraze V, Hislop J, Davies G, Grant S, Paton JY (2008): Objective measurement of physical activity and sedentary behaviour: review with new data. Arch Dis Child 93:614-619
  25. Roh DJ, Jecal Y ( 2013): Obesity rate by a variety of obesity measurements and prevalence of insulin resistance and metabolic syndrome among overweight or obese children. J Korean Soc Living Environ Sys 20(1):88-97
  26. Ryou HJ, Nam HJ, Min YH, Kim YJ, Park HR (2004): Analysis of food habits and nutrients intake of nursery school children living in Anyang city, based on Z-score of weight for height. J Korean Diet Assoc 10(1):1-12
  27. Shin MS, An HR (2007): A literature review: more effective approach for childhood obesity: based on international papers published from 1996 to 2007. J Korean Med Obes Res 7(1):9-22
  28. Suh YS, Kim DH, Shin DH (2000): Relation between body weight and physical activity in preschool children. Korean J Obes 9(2):146-152
  29. Trost SG, McIver KL, Pate RR (2005): Conducting accelerometer-based activity assessments in field-based research. Med Sci Sports Exerc 37(11 Suppl):S531-S543
  30. Vale S, Santos R, Silva P, Soares-Miranda L, Mota J ( 2009): Preschool children physical activity measurement: importance of epoch length choice. Pediatr Exerc Sci 21(4):413-420
  31. van Cauwenberghe E, Labarque V, Trost SG, de Bourdeaudhuij I, Cardon G (2010): Calibration and comparison of accelerometer cut points in preschool children. Int J Pediatr Obes 6(2-2):e582-e589
  32. Welk TA (2002): Remembering well: rituals for celebrating life and mourning death and pilgrim Heart: the inner journey home, by sarah york. Am J Hosp Palliat Care 19(1):59-60

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