{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T04:51:17Z","timestamp":1791175877635,"version":"4.1.0"},"reference-count":18,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T00:00:00Z","timestamp":1791072000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T00:00:00Z","timestamp":1791072000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100025077","name":"Faculty of Medicine, University of Ottawa","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100025077","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Haemophilia"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Physical activity guidelines for children with inherited or acquired bleeding disorders are largely based on expert opinion rather than objective measures of injury exposure, making evidence\u2010based participation recommendations challenging.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Aim<\/jats:title>\n                    <jats:p>To evaluate physical activity injury exposure by objectively measuring physical contact characteristics during childhood physical activity using video analysis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>An observational video analysis was conducted across five childhood physical activities representing varying perceived risk levels (high\/moderate\/low): Ball hockey, ice skating, karate, swimming and physical education. Physical contacts were identified and categorized by sex, age, contact type, intentionality, readiness, movement preceding contact, and injury outcome.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A total of 2976 contacts were identified in 2013.5 minutes of recorded activity. Contact frequency ranged from 0.66 contacts\/minute in swimming to 5.50 contacts\/minute in ice skating, despite its classification as a moderate\u2010risk activity. Contact type varied by activity, with person\u2010ground impacts predominating in physical education and skating and person\u2010person contacts more common in swimming and karate. Over half of all contacts (58%) were unintentional. Only 11 of 2976 contacts (0.4%) resulted in injury.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Objective analysis of childhood physical activity recordings provides evidence regarding contact\u2010related injury risk and may inform participation recommendations for children at risk of bleeding. Observed contact frequencies and patterns suggest that current activity risk classifications may not accurately reflect real\u2010world exposure during childhood physical activity. Expanding objective assessment of childhood physical activities may improve injury prevention strategies and support evidence\u2010based guidelines for at\u2010risk populations.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/hae.70412","type":"journal-article","created":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T04:00:56Z","timestamp":1791172856000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Understanding Contact Risks of Pediatric Physical Activity: Video Analysis to Inform Decisions for Children at Risk of Bleeding Injuries"],"prefix":"10.1111","author":[{"given":"Lauren","family":"Backstein","sequence":"first","affiliation":[{"name":"Faculty of Medicine University of Ottawa  Ottawa Canada"},{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ria","family":"Patel","sequence":"additional","affiliation":[{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"},{"name":"Faculty of Health Sciences McMaster University  Hamilton Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mona","family":"Elmikaty","sequence":"additional","affiliation":[{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"},{"name":"Faculty of Science McMaster University  Hamilton Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brooklyn","family":"Westlake","sequence":"additional","affiliation":[{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"},{"name":"Faculty of Health Sciences University of Ottawa  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Sbeiti","sequence":"additional","affiliation":[{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"},{"name":"Faculty of Health Sciences University of Ottawa  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonardo R.","family":"Brand\u00e3o","sequence":"additional","affiliation":[{"name":"The Hospital for Sick Children and University of Toronto  Toronto Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Klaassen","sequence":"additional","affiliation":[{"name":"Faculty of Medicine University of Ottawa  Ottawa Canada"},{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"},{"name":"Children's Hospital of Eastern Ontario  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Allison","family":"Clouthier","sequence":"additional","affiliation":[{"name":"Faculty of Health Sciences University of Ottawa  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris","family":"Joslin","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Design Carleton University  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan","family":"Graham","sequence":"additional","affiliation":[{"name":"Faculty of Health Sciences University of Ottawa  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia E.","family":"Longmuir","sequence":"additional","affiliation":[{"name":"Children's Hospital of Eastern Ontario Research Institute  Ottawa Canada"},{"name":"Faculty of Health Sciences University of Ottawa  Ottawa Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,4]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1542\/peds.2006-2697","article-title":"Committee on Communications, and the Committee on Psychosocial Aspects of Child and Family Health. 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