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The effects of atrial repolarization on exercise-induced ST-segment depression in apparently healthy females

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dc.contributor.authorBrown, Rhonda K.en
dc.contributor.committeechairHerbert, William G.en
dc.contributor.committeememberSebolt, Don R.en
dc.contributor.committeememberLee, John C.en
dc.contributor.departmentHealth and Physical Educationen
dc.date.accessioned2014-03-14T21:40:15Zen
dc.date.adate2009-07-11en
dc.date.available2014-03-14T21:40:15Zen
dc.date.issued1994-03-17en
dc.date.rdate2009-07-11en
dc.date.sdate2009-07-11en
dc.description.abstractThe relationship between the PQ-segment slope on ST-segment depression during vigorous exercise was examined in 26 apparently healthy females between 18 and 26 years of age. Each subject performed 2 submaximal cycle ergometer exercise tolerance tests (trial A and trial B) on nonconsecutive days wherein the following variables, as delta scores, were measured; P-wave amplitude (microvolts), PQ-segment slope (uV!sec), and J-point at 0 and 60 msec (uV). Each variable was measured by both visual and computer averaging. The degree of reproducibility within and between trials differed for the visual and computer averaged measures. Generally higher reproducibility was found with computer averaging particularly within trial B (r =0.63-0.89, p<O.OI). Trial b served as a basis for assessment of PQ-segment slope effect on ST segment response. Computer analysis of frequency distribution for responses revealed a greater frequency of downsloping PQ-segment with clinically significant ST-segment depression (>50 uV) at both 0 and 60 msec after the J-point in lead II. However, there was a greater percentage (91%) of flat PQ-segment slopes with clinically significant ST-segment depression at J-point 0 msec in lead V5. These findings suggest possible influence of lead selection on the measurements of the PQ-segment slope and ST-segment. Implication of clinical application would be to use lead VS for diagnosing CHD and by measuring ST-segment depression at J-point 60 msec. However when screening exercise ECG tests in apparently healthy women use J-point at 0 msec.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 116 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07112009-040357en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07112009-040357/en
dc.identifier.urihttp://hdl.handle.net/10919/43675en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.B769.pdfen
dc.relation.isformatofOCLC# 31698641en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.B769en
dc.subject.lcshCoronary heart disease -- Diagnosisen
dc.subject.lcshElectrocardiographyen
dc.subject.lcshExercise testsen
dc.subject.lcshHeart function testsen
dc.subject.lcshWomen -- Health risk assessmenten
dc.titleThe effects of atrial repolarization on exercise-induced ST-segment depression in apparently healthy femalesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineHealth and Physical Educationen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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