Nutritional strategies for endurance and ultra-endurance cycling

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dc.contributor.advisorGoedecke, Julaen_ZA
dc.contributor.authorHaveman, Lizeen_ZA
dc.date.accessioned2014-07-28T18:16:36Z
dc.date.available2014-07-28T18:16:36Z
dc.date.issued2008en_ZA
dc.descriptionIncludes abstract.
dc.descriptionIncludes bibliographical references.
dc.description.abstractIngestion of a high carbohydrate (CHO) diet (7-10 g CHO/kg body mass) for 3 days, typically referred to as ‘CHO-loading’, is a commonly recommended dietary practice for endurance sporting events lasting >90 minutes. CHOloading effectively maximizes muscle glycogen stores and has been shown to enhance prolonged exercise performance. However, the body’s glycogen stores are limited, therefore a dietary strategy that would not only increase CHO availability but also ‘spare’ muscle glycogen during exercise may be more beneficial during prolonged exercise compared to a standard CHO-loading diet. Preliminary studies in which athletes ingested a high fat diet (4-4.6 g fat/kg body mass) for 5-6 days followed by 1 day of CHO-loading have been shown to increase fat oxidation and ‘spare’ muscle glycogen during prolonged exercise compared to a high CHO diet. However, the effectiveness of a high fat diet followed by CHO-loading has not been tested in self-paced endurance and ultra-endurance events. Further, there is little available evidence concerning the pre-event habitual dietary practices of ultra-endurance athletes. It is possible that athletes and cyclists competing in endurance and ultra-endurance events have diets which may differ in macronutrient content compared to that typically recommended for endurance events. As a result, athletes may not respond in a similar way to diets typically recommended for endurance and ultra-endurance events, such as CHO-loading. The aims of this thesis were therefore: (1) to characterize the habitual dietary intakes of sub-elite male cyclists before and during an ultra-endurance event; (2) to investigate the effects of different dietary strategies aimed at increasing carbohydrate availability and ‘sparing’ muscle glycogen (e.g. CHO-loading and fat-adaptation), on substrate utilization and exercise performance during simulated endurance and ultra-endurance exercise; and (3) to investigate the individual responsiveness of athletes to these dietary strategies.en_ZA
dc.identifier.apacitationHaveman, L. (2008). <i>Nutritional strategies for endurance and ultra-endurance cycling</i>. (Thesis). University of Cape Town ,Faculty of Health Sciences ,Department of Human Biology. Retrieved from http://hdl.handle.net/11427/3241en_ZA
dc.identifier.chicagocitationHaveman, Lize. <i>"Nutritional strategies for endurance and ultra-endurance cycling."</i> Thesis., University of Cape Town ,Faculty of Health Sciences ,Department of Human Biology, 2008. http://hdl.handle.net/11427/3241en_ZA
dc.identifier.citationHaveman, L. 2008. Nutritional strategies for endurance and ultra-endurance cycling. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Haveman, Lize AB - Ingestion of a high carbohydrate (CHO) diet (7-10 g CHO/kg body mass) for 3 days, typically referred to as ‘CHO-loading’, is a commonly recommended dietary practice for endurance sporting events lasting >90 minutes. CHOloading effectively maximizes muscle glycogen stores and has been shown to enhance prolonged exercise performance. However, the body’s glycogen stores are limited, therefore a dietary strategy that would not only increase CHO availability but also ‘spare’ muscle glycogen during exercise may be more beneficial during prolonged exercise compared to a standard CHO-loading diet. Preliminary studies in which athletes ingested a high fat diet (4-4.6 g fat/kg body mass) for 5-6 days followed by 1 day of CHO-loading have been shown to increase fat oxidation and ‘spare’ muscle glycogen during prolonged exercise compared to a high CHO diet. However, the effectiveness of a high fat diet followed by CHO-loading has not been tested in self-paced endurance and ultra-endurance events. Further, there is little available evidence concerning the pre-event habitual dietary practices of ultra-endurance athletes. It is possible that athletes and cyclists competing in endurance and ultra-endurance events have diets which may differ in macronutrient content compared to that typically recommended for endurance events. As a result, athletes may not respond in a similar way to diets typically recommended for endurance and ultra-endurance events, such as CHO-loading. The aims of this thesis were therefore: (1) to characterize the habitual dietary intakes of sub-elite male cyclists before and during an ultra-endurance event; (2) to investigate the effects of different dietary strategies aimed at increasing carbohydrate availability and ‘sparing’ muscle glycogen (e.g. CHO-loading and fat-adaptation), on substrate utilization and exercise performance during simulated endurance and ultra-endurance exercise; and (3) to investigate the individual responsiveness of athletes to these dietary strategies. DA - 2008 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 T1 - Nutritional strategies for endurance and ultra-endurance cycling TI - Nutritional strategies for endurance and ultra-endurance cycling UR - http://hdl.handle.net/11427/3241 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/3241
dc.identifier.vancouvercitationHaveman L. Nutritional strategies for endurance and ultra-endurance cycling. [Thesis]. University of Cape Town ,Faculty of Health Sciences ,Department of Human Biology, 2008 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/3241en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Human Biologyen_ZA
dc.publisher.facultyFaculty of Health Sciencesen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherHuman Biologyen_ZA
dc.titleNutritional strategies for endurance and ultra-endurance cyclingen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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