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• W2327673980 abstract "The overall aim of this thesis was to examine the influence ofnutritional modifications of the normal diet, on endurance runningperformance.There is considerable evidence demonstrating that a high carbohydrate(CHO) diet in the days prior to exercise can significantly increasethe endurance capacity of cycle ergometry. However, there is limitedevidence to show that endurance running performance is also enhancedby a high CHO diet. Thus the first study presented in this thesisexamined the influence of a high CHO diet on endurance runningperformance over a distance of 30km. Subjects (n=18) attempted tocomplete two 30km runs on a motorised treadmill as fast as possible, 7days apart. Prior to Run 1 all individuals consumed their prescribednormal diet, whereas after Run 1, the normal diet was supplementedwith either high CHO confectionery products for the Carbohydrate group(n=9), or additional fat and protein for the Control group (n=9).There were no significant improvements in the performance time for theindividuals in the CHO group, although they achieved a 1.91improvement compared to a 0.21 decrement in performance time for theControl group. However, the high CHO group demonstrated significantlyhigher running speeds over the last 5km (p(O.OOI), as well assignificantly higher respiratory exchange ratios and blood glucoseconcentrations over the final 10km. To examine the influence of CHO ingestion dur-ing endurance exercise,trained individuals (n=15) ran two simulated races on a motorisedtreadmill, 7 days apart. The subjects aimed to cover as much distanceas possible within two hours, whilst ingesting either a CHO supplementor a Placebo. Seven days later subjects repeated the run whilstingesting the fluid not ingested ,on Run I. Although there were nosignificant differences in'the distances covered, the CHO run showedsignificantly higher running speeds towards the end of the run(p(0.05), with significantly higher blood glucose concentrationsduring the last 30 min of exercise. Fat metabolism was noticeablysuppressed with a concomitant increase in CHO oxidation.The final study attempted to enhance free fatty acid oxidation (FFA)by increasing carnitine availability, the transporter of FFA into themitochondria. Subjects (n=14) completed two endurance capacity runs toexhaustion at 70 IVO. max, 3 weeks apart. During the 3 week interimperiod, half the individuals supplemented their diet with a carnitinesupplement, whilst the others supplemented their diet with a placebo.There was no significant improvement in the run time to exhaustionafter carnitine supplementation. However, there were significantlylower R values and blood glucose concentrations at exhaustion for thecarnitine group, suggesting an increase in fat metabolism with aconcurrent reduction in CHO utilisation. Thus certain nutritionalmodifications of the normal diet may enhance endurance runningperformance in man." @default.
• W2327673980 created "2016-06-24" @default.
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• W2327673980 date "1987-01-01" @default.
• W2327673980 modified "2023-09-27" @default.
• W2327673980 title "Nutritional influences on endurance running performance in man" @default.
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