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Accuracy of momentary time sampling : a comparison of varying interval lengths using SOFIT

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dc.contributor.advisor Mars, Hans van der
dc.creator McNamee, Jeff B.
dc.date.accessioned 2012-06-25T17:59:28Z
dc.date.available 2012-06-25T17:59:28Z
dc.date.copyright 2003-11-21
dc.date.issued 2003-11-21
dc.identifier.uri http://hdl.handle.net/1957/30142
dc.description Graduation date: 2004 en_US
dc.description.abstract The U.S. Department of Health and Human Services has made the promotion of regular physical activity a national health objective, and experts believe that physical education can play a significant role in the promotion of physical activity. Feasible measurement tools to assess physical activity behavior, by physical educators, are lacking. One validated instrument is the System for Observing Fitness Instruction Time (SOFIT; McKenzie, Sallis & Nader, 1991). SOFIT's physical activity data are collected using momentary time sampling (MTS) with a 20-second interval length and provide estimates of Moderate to Vigorous Physical Activity (MVPA). Whether variations in interval lengths would adversely affect the accuracy of the MVPA data has not been investigated. From a clinical perspective, if physical education teachers are to utilize MTS procedures for on-going assessment they will require longer time intervals to collect accurate MVPA data. Therefore, this project sought to determine the accuracy of MVPA levels collected through varying observation tactics (i.e., 20s, 60s, 90s, 120s, 180s, and random) relative to those collected through duration recording (DR). Video records of 30 randomly selected elementary school physical education classes were utilized for this study. Utilizing modified physical activity codes from SOFIT, the researchers collected MTS data regarding students' MVPA at varying interval lengths (i.e., 20s, 60, 90s, 120s, 180s, and random). Three statistical techniques, Pearson-product moment (PPM) correlation coefficients, Repeated Measures Analysis of Variance (RM ANOVA), and Average Error (AE), were utilized to demonstrate concurrent validity of the varying interval lengths. Results demonstrated moderate-low to high correlations between the 20s, 60s, 90s, and random interval lengths and the DR tactic during the total class. The RM ANOVA indicated similarity between all the varying interval lengths and the DR tactic for total class observation. The MTS procedure that created the least amount of AE across classes was the 20s variable followed by the 60s, random, and 90s variables. These findings build empirical evidence for the use of a 60s, random, and 90s MTS procedure for the purpose of MVPA assessment by physical educators. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Physical education and training -- Evaluation en_US
dc.subject.lcsh Physical fitness -- Testing en_US
dc.title Accuracy of momentary time sampling : a comparison of varying interval lengths using SOFIT en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Exercise and Sport Science en_US
dc.degree.level Doctoral en_US
dc.degree.discipline Health and Human Sciences en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Johnson, Rebecca
dc.contributor.committeemember Cusimano, Barbara
dc.contributor.committeemember Ebbeck, Vicki
dc.contributor.committeemember Beeson, Luana
dc.description.digitization File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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