{"doi":"10.1123/jpah.8.4.543","title":"Stability of Habitual Physical Activity and Sedentary Behavior Monitoring by Accelerometry in 6- to 8-Year-Olds","abstract":"<jats:sec sec-type=\"background\"><jats:title>Background:</jats:title><jats:p>Accelerometry is rapidly becoming the instrument of choice for measuring physical activity in children. However, as limited data exist on the minimum number of days accelerometry required to provide a reliable estimate of habitual physical activity, we aimed to quantify the number of days of recording required to estimate both habitual physical activity and habitual sedentary behavior in primary school children.</jats:p></jats:sec><jats:sec sec-type=\"methods\"><jats:title>Methods:</jats:title><jats:p>We measured physical activity and sedentary behavior over 7 days in 291 6- to 8-year-olds using Actigraph accelerometers. Between-day intraclass reliability coefficients were calculated and averaged across all combinations of days.</jats:p></jats:sec><jats:sec sec-type=\"results\"><jats:title>Results:</jats:title><jats:p>Although reliability increased with time, 3 days of recording provided reliabilities for volume of activity, moderate-vigorous intensity activity, and sedentary behavior of 68%, 71%, and 73%, respectively.</jats:p></jats:sec><jats:sec sec-type=\"conclusions\"><jats:title>Conclusions:</jats:title><jats:p>For our sample and setting, 3 days accelerometry provided reliable estimates of the main constructs of physical activity and sedentary behavior.</jats:p></jats:sec>","journal":"Journal of Physical Activity and Health","year":2011,"id":603336,"datarank":0.6456097639806255,"base_score":4.304065093204169,"endowment":4.304065093204169,"self_citation_contribution":0.6456097639806255,"citation_network_contribution":0.0,"self_endowment_contribution":0.6456097639806255,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":73,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1547734,"name":"Ashley J. Adamson","orcid":null,"position":1,"is_corresponding":false},{"id":1066950,"name":"Mark S. Pearce","orcid":"0000-0002-0583-3779","position":2,"is_corresponding":false},{"id":631091,"name":"John J. Reilly","orcid":"0000-0001-6165-5471","position":3,"is_corresponding":false},{"id":1547733,"name":"Laura Basterfield","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"resolved":true,"title":"Stability of Habitual Physical Activity and Sedentary Behavior Monitoring by Accelerometry in 6- to 8-Year-Olds","abstract":"<jats:sec sec-type=\"background\"><jats:title>Background:</jats:title><jats:p>Accelerometry is rapidly becoming the instrument of choice for measuring physical activity in children. However, as limited data exist on the minimum number of days accelerometry required to provide a reliable estimate of habitual physical activity, we aimed to quantify the number of days of recording required to estimate both habitual physical activity and habitual sedentary behavior in primary school children.</jats:p></jats:sec><jats:sec sec-type=\"methods\"><jats:title>Methods:</jats:title><jats:p>We measured physical activity and sedentary behavior over 7 days in 291 6- to 8-year-olds using Actigraph accelerometers. Between-day intraclass reliability coefficients were calculated and averaged across all combinations of days.</jats:p></jats:sec><jats:sec sec-type=\"results\"><jats:title>Results:</jats:title><jats:p>Although reliability increased with time, 3 days of recording provided reliabilities for volume of activity, moderate-vigorous intensity activity, and sedentary behavior of 68%, 71%, and 73%, respectively.</jats:p></jats:sec><jats:sec sec-type=\"conclusions\"><jats:title>Conclusions:</jats:title><jats:p>For our sample and setting, 3 days accelerometry provided reliable estimates of the main constructs of physical activity and sedentary behavior.</jats:p></jats:sec>","is_dataset_classified":null,"base_score":0.0,"endowment":0.0,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"21597127","pmcid":null,"openalex_id":null,"authors":[],"funders":[{"funder_name":"Medical Research Council","grant_id":"G0900686","title":null},{"funder_name":"Economic and Social Research Council","grant_id":"ES/G007470/1","title":null},{"funder_name":"National Institute for Health Research (NIHR)","grant_id":"PHCS/C4/4/008","title":null},{"funder_name":"Chief Scientist Office","grant_id":"","title":null},{"funder_name":"National Institute for Health Research (NIHR)","grant_id":"","title":null},{"funder_name":"British Heart Foundation","grant_id":"","title":null},{"funder_name":"Cancer Research UK","grant_id":"","title":null}],"total_grants":7,"fwci":null,"citation_percentile":null,"influential_citations":0,"citation_trend":[],"oa_status":"closed","license":null,"oa_locations":[{"url":"https://journals.humankinetics.com/view/journals/jpah/8/4/article-p543.xml","host_type":"publisher"},{"url":"https://journals.humankinetics.com/downloadpdf/journals/jpah/8/4/article-p543.xml","host_type":"publisher"}],"fields_of_study":[],"mesh_terms":["Humans","Monitoring, Physiologic","Reproducibility of Results","Child Behavior","Habits","Motor Activity","Choice Behavior","Time Factors","Child","England","Female","Male","Sedentary Behavior"],"keywords":[],"sdg_mappings":[],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-07-29T21:39:39.348357Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}