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dc.contributor.authorBradley, Nicolette Shannon.en_US
dc.date.accessioned2009-06-29T14:36:58Z
dc.date.available2009-06-29T14:36:58Z
dc.date.issued2006-06-29T14:36:58Z
dc.identifier.urihttp://hdl.handle.net/10464/1659
dc.description.abstractPyruvate dehydrogenase (PDH) is an important regulator of carbohydrate oxidation during exercise and its activity can be down-regulated by an increase in dietary fat. The purpose of this study was to determine the acute metabolic effects of differential dietary fatty acids on the activation of PDH in its active form (PDHa) at rest and at the onset of moderate-intensity exercise. University-aged male subjects (n=7) underwent 2 fat loading trials spaced at least 2 weeks apart. Subjects consumed saturated (SFA) or polyunsaturated (PUFA) fat over the course of 5 hours. Following this, participants cycled at 65% VO2 max for 15 min. Muscle biopsies were taken prior to and following fat loading and at 1 min exercise. Plasma free fatty acids increased from 0.15 ± 0.07 to 0.54 ± 0.19 mM over 5 hours with SFA and from 0.1 1 ± 0.04 to 0.35 ±0.13 mM with PUFA. PDHa activity was unchanged following fat loading, but increased at the onset of exercise in the SFA trial, from 1 .4 ± 0.4 to 2.2 ± 0.4 /xmol/min/kg wet wt. This effect was negated in the PUFA trial (1 .2 ± 0.3 to 1 .3 ± 0.3 pimol/min/kg wet wt.). PDH kinase (PDK) was unchanged in both trials, suggesting that the attenuation of PDHa activity with PUFA was a result of changes in the concentrations of intramitochondrial effectors, more specifically intramitochondrial NADH or Ca^*. Our findings suggest that attenuated PDHa activity participates in the preferential oxidation of PUFA during moderateintensity exercise.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectPyruvate kinase.en_US
dc.subjectFatty acids.en_US
dc.subjectFatty acids in human nutrition.en_US
dc.subjectMuscle proteins.en_US
dc.subjectMusclesen_US
dc.subjectExerciseen_US
dc.titleThe acute effects of differential dietary fatty acids on PDHa activity in human skeletal muscle at the onset of exerciseen_US
dc.typeElectronic Thesis or Dissertationen
dc.degree.nameM.Sc. Applied Health Sciencesen_US
dc.degree.levelMastersen_US
dc.contributor.departmentApplied Health Sciences Programen_US
refterms.dateFOA2021-07-31T01:41:36Z


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