Impact of methodological decisions on accelerometer outcome variables in young children

R. Ojiambo, R. Cuthill, H. Budd, K. Konstabel, J. A. Casajus, A. Gonzalez-Aguero, E. Anjila, J. J. Reilly, C. Easton, Y. P. Pitsiladis

Research output: Contribution to journalArticle

Abstract

Background: The impact of accelerometer-related methodological decisions relating to the assessment of physical activity and sedentary time has not been conclusively determined in young children.Objectives: To determine the effects of epoch and cutoff points on the assessment of physical activity and sedentary time and to determine the accelerometer wear time required to achieve reliable accelerometer data in children.Design: Children were recruited from centres at Ghent, Glasgow, Gothenburg and Zaragoza.Methods: Physical activity was assessed for 1 week in 86 children (41 girls, 45 boys; mean age 7 +/- 2 years) by uniaxial accelerometry. The epoch was set at 15 s and reintegrated to 30 and 60 s. Time spent sedentary and in moderate and vigorous physical activity (MVPA) was assessed using a range of cutoff points. Number of days required to achieve 80% reliability was predicted using the Spearman-Brown Prophecy formula.Results: The Reilly cutoff points (< 1100 counts per min (CPM)) indicated less sedentary time per day when comparing 15 vs 30 s and 15 vs 60 s epochs: 570 +/- 91 vs 579 +/- 93 min and 570 +/- 91 vs 579 +/- 94 min, respectively; P < 0.05. Pate cutoff points (> 420 counts per 15 s) reported more MVPA time per day compared with Sirard (890 counts per 15 s) and Puyau cutoff points (> 3200 counts per min) using 15 s epoch: 78 (4-197) min (median (range) vs 18 (1-80) min and 24 (1-100) min, respectively; P < 0.001. Compliance with guidelines of at least 60 min MVPA was 84, 78 and 73% for Pate cutoff points using 15, 30 and 60 s epochs, respectively, but 0% for Sirard and Puyau cutoff points across epochs. The number of days required to achieve 80% reliability for CPM, sedentary and MVPA time was 7.4-8.5 days.Conclusion: Choice of epoch and cutoff point significantly influenced the classification of sedentary and MVPA time and observed compliance to the MVPA guidelines.
Original languageEnglish
Pages (from-to)S98-S103
Number of pages6
JournalInternational Journal of Obesity
Volume35
Issue numberSupplement 1
DOIs
Publication statusPublished - Apr 2011
Externally publishedYes

Keywords

  • IDEFICS
  • accelerometry
  • MVPA
  • objective measurement

Cite this

Ojiambo, R., Cuthill, R., Budd, H., Konstabel, K., Casajus, J. A., Gonzalez-Aguero, A., ... Pitsiladis, Y. P. (2011). Impact of methodological decisions on accelerometer outcome variables in young children. International Journal of Obesity, 35(Supplement 1), S98-S103. https://doi.org/10.1038/ijo.2011.40
Ojiambo, R. ; Cuthill, R. ; Budd, H. ; Konstabel, K. ; Casajus, J. A. ; Gonzalez-Aguero, A. ; Anjila, E. ; Reilly, J. J. ; Easton, C. ; Pitsiladis, Y. P. / Impact of methodological decisions on accelerometer outcome variables in young children. In: International Journal of Obesity. 2011 ; Vol. 35, No. Supplement 1. pp. S98-S103.
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abstract = "Background: The impact of accelerometer-related methodological decisions relating to the assessment of physical activity and sedentary time has not been conclusively determined in young children.Objectives: To determine the effects of epoch and cutoff points on the assessment of physical activity and sedentary time and to determine the accelerometer wear time required to achieve reliable accelerometer data in children.Design: Children were recruited from centres at Ghent, Glasgow, Gothenburg and Zaragoza.Methods: Physical activity was assessed for 1 week in 86 children (41 girls, 45 boys; mean age 7 +/- 2 years) by uniaxial accelerometry. The epoch was set at 15 s and reintegrated to 30 and 60 s. Time spent sedentary and in moderate and vigorous physical activity (MVPA) was assessed using a range of cutoff points. Number of days required to achieve 80{\%} reliability was predicted using the Spearman-Brown Prophecy formula.Results: The Reilly cutoff points (< 1100 counts per min (CPM)) indicated less sedentary time per day when comparing 15 vs 30 s and 15 vs 60 s epochs: 570 +/- 91 vs 579 +/- 93 min and 570 +/- 91 vs 579 +/- 94 min, respectively; P < 0.05. Pate cutoff points (> 420 counts per 15 s) reported more MVPA time per day compared with Sirard (890 counts per 15 s) and Puyau cutoff points (> 3200 counts per min) using 15 s epoch: 78 (4-197) min (median (range) vs 18 (1-80) min and 24 (1-100) min, respectively; P < 0.001. Compliance with guidelines of at least 60 min MVPA was 84, 78 and 73{\%} for Pate cutoff points using 15, 30 and 60 s epochs, respectively, but 0{\%} for Sirard and Puyau cutoff points across epochs. The number of days required to achieve 80{\%} reliability for CPM, sedentary and MVPA time was 7.4-8.5 days.Conclusion: Choice of epoch and cutoff point significantly influenced the classification of sedentary and MVPA time and observed compliance to the MVPA guidelines.",
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Ojiambo, R, Cuthill, R, Budd, H, Konstabel, K, Casajus, JA, Gonzalez-Aguero, A, Anjila, E, Reilly, JJ, Easton, C & Pitsiladis, YP 2011, 'Impact of methodological decisions on accelerometer outcome variables in young children' International Journal of Obesity, vol. 35, no. Supplement 1, pp. S98-S103. https://doi.org/10.1038/ijo.2011.40

Impact of methodological decisions on accelerometer outcome variables in young children. / Ojiambo, R.; Cuthill, R.; Budd, H.; Konstabel, K.; Casajus, J. A.; Gonzalez-Aguero, A.; Anjila, E.; Reilly, J. J.; Easton, C.; Pitsiladis, Y. P.

In: International Journal of Obesity, Vol. 35, No. Supplement 1, 04.2011, p. S98-S103.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Impact of methodological decisions on accelerometer outcome variables in young children

AU - Ojiambo, R.

AU - Cuthill, R.

AU - Budd, H.

AU - Konstabel, K.

AU - Casajus, J. A.

AU - Gonzalez-Aguero, A.

AU - Anjila, E.

AU - Reilly, J. J.

AU - Easton, C.

AU - Pitsiladis, Y. P.

PY - 2011/4

Y1 - 2011/4

N2 - Background: The impact of accelerometer-related methodological decisions relating to the assessment of physical activity and sedentary time has not been conclusively determined in young children.Objectives: To determine the effects of epoch and cutoff points on the assessment of physical activity and sedentary time and to determine the accelerometer wear time required to achieve reliable accelerometer data in children.Design: Children were recruited from centres at Ghent, Glasgow, Gothenburg and Zaragoza.Methods: Physical activity was assessed for 1 week in 86 children (41 girls, 45 boys; mean age 7 +/- 2 years) by uniaxial accelerometry. The epoch was set at 15 s and reintegrated to 30 and 60 s. Time spent sedentary and in moderate and vigorous physical activity (MVPA) was assessed using a range of cutoff points. Number of days required to achieve 80% reliability was predicted using the Spearman-Brown Prophecy formula.Results: The Reilly cutoff points (< 1100 counts per min (CPM)) indicated less sedentary time per day when comparing 15 vs 30 s and 15 vs 60 s epochs: 570 +/- 91 vs 579 +/- 93 min and 570 +/- 91 vs 579 +/- 94 min, respectively; P < 0.05. Pate cutoff points (> 420 counts per 15 s) reported more MVPA time per day compared with Sirard (890 counts per 15 s) and Puyau cutoff points (> 3200 counts per min) using 15 s epoch: 78 (4-197) min (median (range) vs 18 (1-80) min and 24 (1-100) min, respectively; P < 0.001. Compliance with guidelines of at least 60 min MVPA was 84, 78 and 73% for Pate cutoff points using 15, 30 and 60 s epochs, respectively, but 0% for Sirard and Puyau cutoff points across epochs. The number of days required to achieve 80% reliability for CPM, sedentary and MVPA time was 7.4-8.5 days.Conclusion: Choice of epoch and cutoff point significantly influenced the classification of sedentary and MVPA time and observed compliance to the MVPA guidelines.

AB - Background: The impact of accelerometer-related methodological decisions relating to the assessment of physical activity and sedentary time has not been conclusively determined in young children.Objectives: To determine the effects of epoch and cutoff points on the assessment of physical activity and sedentary time and to determine the accelerometer wear time required to achieve reliable accelerometer data in children.Design: Children were recruited from centres at Ghent, Glasgow, Gothenburg and Zaragoza.Methods: Physical activity was assessed for 1 week in 86 children (41 girls, 45 boys; mean age 7 +/- 2 years) by uniaxial accelerometry. The epoch was set at 15 s and reintegrated to 30 and 60 s. Time spent sedentary and in moderate and vigorous physical activity (MVPA) was assessed using a range of cutoff points. Number of days required to achieve 80% reliability was predicted using the Spearman-Brown Prophecy formula.Results: The Reilly cutoff points (< 1100 counts per min (CPM)) indicated less sedentary time per day when comparing 15 vs 30 s and 15 vs 60 s epochs: 570 +/- 91 vs 579 +/- 93 min and 570 +/- 91 vs 579 +/- 94 min, respectively; P < 0.05. Pate cutoff points (> 420 counts per 15 s) reported more MVPA time per day compared with Sirard (890 counts per 15 s) and Puyau cutoff points (> 3200 counts per min) using 15 s epoch: 78 (4-197) min (median (range) vs 18 (1-80) min and 24 (1-100) min, respectively; P < 0.001. Compliance with guidelines of at least 60 min MVPA was 84, 78 and 73% for Pate cutoff points using 15, 30 and 60 s epochs, respectively, but 0% for Sirard and Puyau cutoff points across epochs. The number of days required to achieve 80% reliability for CPM, sedentary and MVPA time was 7.4-8.5 days.Conclusion: Choice of epoch and cutoff point significantly influenced the classification of sedentary and MVPA time and observed compliance to the MVPA guidelines.

KW - IDEFICS

KW - accelerometry

KW - MVPA

KW - objective measurement

U2 - 10.1038/ijo.2011.40

DO - 10.1038/ijo.2011.40

M3 - Article

VL - 35

SP - S98-S103

JO - International Journal of Obesity

JF - International Journal of Obesity

SN - 0307-0565

IS - Supplement 1

ER -

Ojiambo R, Cuthill R, Budd H, Konstabel K, Casajus JA, Gonzalez-Aguero A et al. Impact of methodological decisions on accelerometer outcome variables in young children. International Journal of Obesity. 2011 Apr;35(Supplement 1):S98-S103. https://doi.org/10.1038/ijo.2011.40