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dc.contributor.advisorDiMarco, Nancy M.
dc.creatorJoy, Jordan M
dc.date.accessioned2018-08-02T15:02:17Z
dc.date.available2018-08-02T15:02:17Z
dc.date.created2018-05
dc.date.issued6/7/2018
dc.date.submittedMay-18
dc.identifier.urihttp://hdl.handle.net/11274/10163
dc.description.abstractAthletes often manipulate dietary carbohydrates, and one dietary approach is a low-carbohydrate, high-fat, ketogenic diet (KD). Therefore, the purpose of the present investigation was to compare effects of a KD and a control diet (CD) on body composition and athletic performance in trained males and females. In a parallel-arm, longitudinal, diet- and exercise-controlled design, 39 participants (23 ± 4.4 years; 75.8 ± 15.5 kg; 169.4 ± 8.3 cm) exercised for 9 weeks while consuming either a KD or a CD. Diets were matched for energy intake. Non-protein macronutrients for the KD (percent energy as carbohydrate:fat:protein, 5:72:23) differed from the CD (53:24:23). Pre- and post-testing were conducted during the weeks prior to and following the intervention. A 5-component (5C) model of body composition was calculated using Dual X-ray Absorptiometry (DXA)-determined bone mineral content (BMC) and fat mass (FM), bioelectric impedance spectroscopy (BIS)-determined intra- (ICF) and extracellular fluid (ECF), and scale weight data. Tests of athletic performance included vertical jump (VJ), 1-repetition maximum (1RM) in the back squat and bench press, repeated Wingate sprints, and a 5 km time trial (5k) run. A significant group by time effect for body weight (p = 0.031) was observed for KD (-1.1 ± 1.9 kg) versus CD (+0.3 ± 1.9 kg), and this was associated with a trend (p = 0.075) for greater loss of FM (KD: -3.2 ± 2.8; CD: -1.9 ± 1.6 kg), which was lost with the 5C model (p = 0.260). KD reduced (p = 0.017) ECF compared to CD (KD: -0.3 ± 0.6; CD: +0.3 ± 0.9 L), yet increases in lean soft tissue (LST) were identical between groups (+2.1 ± 1.5 kg). KD tended to reduce (p = 0.054) peak power (PP) output during the first Wingate sprint (KD: -28.1 ± 85.9; CD: +25.1 ± 79.7 W). Recovery of PP between the first and final set was significantly greater (p = 0.042) in KD (+155.9 ± 147.4 W) than CD (+70.0 ± 98.6 W). The present data suggest that overall exercise adaptations are not compromised following 9 weeks of a KD. A KD reduces body weight, predominately as FM.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.subjectstrength
dc.subjectdiet
dc.subjectnutrition
dc.subjectsports nutrition
dc.subjectlow-carb
dc.subjectendurance
dc.subjectketones
dc.subjectbhb
dc.subjecttargetted ketogenic diet
dc.subjectcyclic ketogenic diet
dc.subjectcarbohydrate restriction
dc.titleComparative effects of a low-fat diet and a high-fat, ketogenic diet on body composition and athletic performance in recreationally-active males and females
dc.typeThesis
dc.date.updated2018-08-02T15:02:17Z
thesis.degree.departmentNutrition and Food Sciences
thesis.degree.disciplineNutrition
thesis.degree.grantorTexas Woman's University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
dc.contributor.committeeMemberRigby, B. Rhett
dc.contributor.committeeMemberDu, Xiaofen
dc.contributor.committeeMemberBroughton, K. Shane
dc.contributor.committeeMemberWildman, Robert
dc.contributor.committeeMemberMoon, Jordan R.
dc.contributor.committeeMemberSerrano, Eric
dc.type.materialtext


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