Effects of chronic suboptimal energy intake on constant-load exercise in young women

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dc.contributor.authorFritsch, LeaAnn Thompsonen
dc.contributor.committeechairDavis, Shala E.en
dc.contributor.committeememberThomas, Elizabeth A.en
dc.contributor.committeememberSebolt, Don R.en
dc.contributor.departmentHuman Nutrition, Foods, and Exerciseen
dc.date.accessioned2014-03-14T21:45:57Zen
dc.date.adate2008-09-18en
dc.date.available2014-03-14T21:45:57Zen
dc.date.issued1996-10-15en
dc.date.rdate2008-09-18en
dc.date.sdate2008-09-18en
dc.description.abstractThe physiologic and metabolic effects of chronic consumption of energy below recommended levels on constant-load exercise was studied in women age 19-24 years. Ten controls (average caloric intake ~ 35 kcal/kg body weight) and 10 subjects with suboptimal energy intake (average caloric intake - 25 kcal/kg body weight) were matched for age, exercise caloric expenditure and percentage of HB-predicted RMR. Subjects (n=20) completed a maximal incremental cycle ergometer test and a 30-minute cycle ergometer test at 75 % of peak oxygen consumption. Although both groups presented a significant increase in ventilation (VE) over time of exercise, the rate of change in VE and end-exercise VE value was significantly greater, F (1 J 18) = 5.63, P < .05, for the suboptimal energy intake group than for the controls. Although not statistically significant (p = 0.454), heart rate (HR) tended to be continuously higher for the suboptimal energy intake group than the control group during the constant-load cycle test. Peripheral ratings of perceived exertion (RPE-L) also tended to be higher for the suboptimal energy intake group at the end of constant-load exercise, however, not significantly (p = 0.072). Two subjects in the suboptimal energy intake group failed to complete the 30-minute submaximal constant-load cycle test; one completed 15 minutes and the other 20 minutes. All subjects in the control group completed the entire submaximal constant-load test (30 minutes). These results suggest that women with chronic suboptimal energy intake have increased difficulty tolerating moderate intensity exercise for 30 minutes (an intensity and duration that mimics a typical exercise session).en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 102 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09182008-063227en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09182008-063227/en
dc.identifier.urihttp://hdl.handle.net/10919/44800en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.F758.pdfen
dc.relation.isformatofOCLC# 36222589en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectresting metabolic rateen
dc.subjectsuboptimal energy intakeen
dc.subjectconstant-loaden
dc.subject.lccLD5655.V855 1996.F758en
dc.titleEffects of chronic suboptimal energy intake on constant-load exercise in young womenen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineHuman Nutrition, Foods, and Exerciseen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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