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- Publisher Website: 10.1016/j.jsams.2012.05.015
- Scopus: eid_2-s2.0-84873524763
- PMID: 22749940
- WOS: WOS:000315753500009
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Article: The effect of reintegrating Actigraph accelerometer counts in preschool children: Comparison using different epoch lengths
Title | The effect of reintegrating Actigraph accelerometer counts in preschool children: Comparison using different epoch lengths |
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Authors | |
Keywords | Measurement Child Estimate Youth Threshold Moderate-to-vigorous physical activity |
Issue Date | 2013 |
Citation | Journal of Science and Medicine in Sport, 2013, v. 16, n. 2, p. 129-134 How to Cite? |
Abstract | Objectives: The purpose of this study was to determine whether ActiGraph accelerometer activity counts and estimates of moderate-to-vigorous physical activity collected at a single larger epoch are comparable to those collected at smaller epochs reintegrated into a larger epoch. Design: A cross-sectional study design. Methods: Thirty-one preschoolers (3-5. years) concurrently wore four accelerometers that were each initialized at four different epoch lengths (1. s, 15. s, 30. s, and 60. s) during a full preschool day. Counts collected at 1. s, 15. s, and 30. s epoch were each reintegrated and compared to those collected at a larger epoch (e.g., counts from one 15. s epoch vs. consecutive sum of counts from fifteen 1. s epochs). Six sets of cut-points (Pate, Freedson, Sirard, Van Cauwenberghe, Evenson and Puyau) were applied to estimate moderate-to-vigorous physical activity minutes. Paired t-test and Cohen's d were used to compare group mean differences. Absolute percent errors Bland-Altman plots with limits of agreement were used to compare individual differences. Results: Minimal group mean differences were found for counts and moderate-to-vigorous physical activity estimates between larger and reintegrated epochs. Relatively smaller absolute percent errors (6.2-9.2%) and limits of agreements (-15.52%, 18.00% to -28.27%, 28.02%) were observed for counts than absolute percent errors (10.1-50.3%) and limits of agreements (-27.3%, 33.3% to -156.9%, 137.9%) for moderate-to-vigorous physical activity estimates. Conclusions: Smaller individual differences in activity counts tended to yield larger individual variations in moderate-to-vigorous physical activity estimates, despite minimal group mean differences. Therefore, researchers reintegrating smaller epochs into a larger epoch should be conscious of possible differences in moderate-to-vigorous physical activity estimates obtained from a single larger epoch. © 2012. |
Persistent Identifier | http://hdl.handle.net/10722/266955 |
ISSN | 2023 Impact Factor: 3.0 2023 SCImago Journal Rankings: 1.222 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Kim, Youngwon | - |
dc.contributor.author | Beets, Michael W. | - |
dc.contributor.author | Pate, Russell R. | - |
dc.contributor.author | Blair, Steven N. | - |
dc.date.accessioned | 2019-01-31T07:20:05Z | - |
dc.date.available | 2019-01-31T07:20:05Z | - |
dc.date.issued | 2013 | - |
dc.identifier.citation | Journal of Science and Medicine in Sport, 2013, v. 16, n. 2, p. 129-134 | - |
dc.identifier.issn | 1440-2440 | - |
dc.identifier.uri | http://hdl.handle.net/10722/266955 | - |
dc.description.abstract | Objectives: The purpose of this study was to determine whether ActiGraph accelerometer activity counts and estimates of moderate-to-vigorous physical activity collected at a single larger epoch are comparable to those collected at smaller epochs reintegrated into a larger epoch. Design: A cross-sectional study design. Methods: Thirty-one preschoolers (3-5. years) concurrently wore four accelerometers that were each initialized at four different epoch lengths (1. s, 15. s, 30. s, and 60. s) during a full preschool day. Counts collected at 1. s, 15. s, and 30. s epoch were each reintegrated and compared to those collected at a larger epoch (e.g., counts from one 15. s epoch vs. consecutive sum of counts from fifteen 1. s epochs). Six sets of cut-points (Pate, Freedson, Sirard, Van Cauwenberghe, Evenson and Puyau) were applied to estimate moderate-to-vigorous physical activity minutes. Paired t-test and Cohen's d were used to compare group mean differences. Absolute percent errors Bland-Altman plots with limits of agreement were used to compare individual differences. Results: Minimal group mean differences were found for counts and moderate-to-vigorous physical activity estimates between larger and reintegrated epochs. Relatively smaller absolute percent errors (6.2-9.2%) and limits of agreements (-15.52%, 18.00% to -28.27%, 28.02%) were observed for counts than absolute percent errors (10.1-50.3%) and limits of agreements (-27.3%, 33.3% to -156.9%, 137.9%) for moderate-to-vigorous physical activity estimates. Conclusions: Smaller individual differences in activity counts tended to yield larger individual variations in moderate-to-vigorous physical activity estimates, despite minimal group mean differences. Therefore, researchers reintegrating smaller epochs into a larger epoch should be conscious of possible differences in moderate-to-vigorous physical activity estimates obtained from a single larger epoch. © 2012. | - |
dc.language | eng | - |
dc.relation.ispartof | Journal of Science and Medicine in Sport | - |
dc.subject | Measurement | - |
dc.subject | Child | - |
dc.subject | Estimate | - |
dc.subject | Youth | - |
dc.subject | Threshold | - |
dc.subject | Moderate-to-vigorous physical activity | - |
dc.title | The effect of reintegrating Actigraph accelerometer counts in preschool children: Comparison using different epoch lengths | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.jsams.2012.05.015 | - |
dc.identifier.pmid | 22749940 | - |
dc.identifier.scopus | eid_2-s2.0-84873524763 | - |
dc.identifier.volume | 16 | - |
dc.identifier.issue | 2 | - |
dc.identifier.spage | 129 | - |
dc.identifier.epage | 134 | - |
dc.identifier.eissn | 1878-1861 | - |
dc.identifier.isi | WOS:000315753500009 | - |
dc.identifier.issnl | 1878-1861 | - |