{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T01:10:42Z","timestamp":1790644242379,"version":"4.1.0"},"reference-count":53,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["JAHA"],"published-print":{"date-parts":[[2026,1,6]]},"abstract":"<jats:sec xml:lang=\"en\">\n                    <jats:title>Background<\/jats:title>\n                    <jats:p xml:lang=\"en\">The aim of this study was to investigate the time course of cardiac arrhythmias following a bout of high\u2010volume exercise and to identify factors associated with abnormal cardiac arrhythmia.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec xml:lang=\"en\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p xml:lang=\"en\">Thirty\u2010four recreational cyclists with 12 (interquartile range, 7\u201320) years of riding experience were recruited for this repeated\u2010measure cohort study. Participants cycled for up to 6 hours at \u224880% heart rate reserve. Cardiac arrhythmias were recorded using a 5\u2010lead Holter monitor for 4\u2009days before exercise, the day of exercise, and 4\u2009days after exercise. Arrhythmias were quantified as totals, abnormal arrhythmias (arrhythmias meeting international consensus criteria for cardiac arrhythmias requiring further investigation), and relative risk.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec xml:lang=\"en\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p xml:lang=\"en\">\n                      Sixty\u2010eight percent of participants displayed abnormal cardiac arrhythmias. No between\u2010day differences in the number of arrhythmias were found (\n                      <jats:italic toggle=\"no\">P<\/jats:italic>\n                      &gt;0.10). However, the proportion of cyclists with abnormal ventricular arrhythmias was higher on the exercise day compared with preexercise days and the day after exercise (\n                      <jats:italic toggle=\"no\">P<\/jats:italic>\n                      &lt;0.05). The relative risk of abnormal cardiac arrhythmia on the exercise day increased proportionally with the number of days that preexercise arrhythmias were recorded (peaking at a relative risk of 5.0 for those with arrhythmia on \u22653 preexercise days). Abnormal cardiac arrhythmia on the exercise day was associated with age, preexercise premature ventricular contractions, and preexercise abnormal cardiac arrhythmia.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec xml:lang=\"en\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p xml:lang=\"en\">High\u2010volume cycling increased the likelihood of abnormal ventricular arrhythmia on the day of exercise. Extended monitoring revealed a high prevalence of abnormal cardiac arrhythmias among recreational cyclists. Current screening practices in many countries are typically limited to elite athletes, meaning recreationally active people are not routinely assessed for exercise\u2010induced arrhythmias. Our findings suggest that some individuals in this group may have clinically relevant arrhythmias that would otherwise go undetected without targeted evaluation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1161\/jaha.125.044378","type":"journal-article","created":{"date-parts":[[2025,12,17]],"date-time":"2025-12-17T10:45:01Z","timestamp":1765968301000},"update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Time Course of Cardiac Arrhythmia Following High\u2010Volume Exercise in Recreational Cyclists"],"prefix":"10.1161","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7316-6373","authenticated-orcid":false,"given":"Daniel W. T.","family":"Wundersitz","sequence":"first","affiliation":[{"name":"La Trobe University","place":["Bendigo, Australia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Blake E. 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