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Meas."],"published-print":{"date-parts":[[2021,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:italic>Objective<\/jats:italic>. Currently, a recording of 300 s is recommended to obtain accurate dynamic cerebral autoregulation estimates using transfer function analysis (TFA). Therefore, this investigation sought to explore the concurrent validity and the within- and between-day reliability of TFA estimates derived from shorter recording durations from squat-stand maneuvers.<jats:italic>Approach<\/jats:italic>. Retrospective analyses were performed on 70 young, recreationally active or endurance-trained participants (17 females; age: 26\u00a0\u00b1\u00a05 years, [range: 20\u201339 years]; body mass index: 24\u00a0\u00b1\u00a03 kg m<jats:sup>\u22122<\/jats:sup>). Participants performed 300 s of squat-stands at frequencies of 0.05 and 0.10 Hz, where shorter recordings of 60, 120, 180, and 240 s were extracted. Continuous transcranial Doppler ultrasound recordings were taken within the middle and posterior cerebral arteries. Coherence, phase, gain, and normalized gain metrics were derived. Bland\u2013Altman plots with 95% limits of agreement (LOA), repeated measures ANOVA\u2019s, two-tailed paired t-tests, coefficient of variation, Cronbach\u2019s alpha, intraclass correlation coefficients, and linear regressions were conducted.<jats:italic>Main results<\/jats:italic>. When examining the concurrent validity across different recording durations, group differences were noted within coherence (<jats:italic>F<\/jats:italic><jats:sub>(4155)<\/jats:sub>\u00a0&gt;\u00a011.6,<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001) but not phase (<jats:italic>F<\/jats:italic><jats:sub>(4155)<\/jats:sub>\u00a0&lt;\u00a00.27,<jats:italic>p<\/jats:italic>\u00a0&gt;\u00a00.611), gain (<jats:italic>F<\/jats:italic><jats:sub>(4155)<\/jats:sub>\u00a0&lt;\u00a00.61,<jats:italic>p<\/jats:italic>\u00a0&gt;\u00a00.440), or normalized gain (<jats:italic>F<\/jats:italic><jats:sub>(4155)<\/jats:sub>\u00a0&lt;\u00a00.85,<jats:italic>p<\/jats:italic>\u00a0&gt;\u00a00.359) parameters. The Bland\u2013Altman 95% LOA measuring the concurrent validity, trended to narrow as recording duration increased (60 s:\u00a0&lt;\u00a0\u00b10.4, 120 s:\u00a0&lt;\u00a0\u00b10.3, 180 s \u00a0&lt;\u00a0\u00b10.3, 240 s:\u00a0&lt;\u00a0\u00b10.1). The validity of the 180 and 240 s recordings further increased when physiological covariates were included within regression models.<jats:italic>Significance<\/jats:italic>. Future studies examining autoregulation should seek to have participants perform 300 s of squat-stand maneuvers. However, valid and reliable TFA estimates can be drawn from 240 s or 180 s recordings if physiological covariates are controlled.<\/jats:p>","DOI":"10.1088\/1361-6579\/abf1af","type":"journal-article","created":{"date-parts":[[2021,3,24]],"date-time":"2021-03-24T22:45:17Z","timestamp":1616625917000},"page":"044002","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":18,"title":["What recording duration is required to provide physiologically valid and reliable dynamic cerebral autoregulation transfer functional analysis estimates?"],"prefix":"10.1088","volume":"42","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9756-5793","authenticated-orcid":false,"given":"Joel S","family":"Burma","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lauren N","family":"Miutz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kailey T","family":"Newel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5440-2804","authenticated-orcid":false,"given":"Lawrence","family":"Labrecque","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3864-6619","authenticated-orcid":false,"given":"Audrey","family":"Drapeau","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patrice","family":"Brassard","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paige","family":"Copeland","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alannah","family":"Macaulay","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1054-0038","authenticated-orcid":false,"given":"Jonathan D","family":"Smirl","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2021,5,11]]},"reference":[{"key":"pmeaabf1afbib1","doi-asserted-by":"publisher","first-page":"45","DOI":"10.1161\/01.STR.20.1.45","article-title":"Cerebral autoregulation dynamics in humans","volume":"20","author":"Aaslid","year":"1989","journal-title":"Stroke"},{"key":"pmeaabf1afbib2","doi-asserted-by":"publisher","first-page":"1081","DOI":"10.1152\/japplphysiol.00854.2014","article-title":"Transcranial Doppler ultrasound: valid, invalid, or both?","volume":"117","author":"Ainslie","year":"2014","journal-title":"J. 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