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Vpliv sestave obroka na oksidativni metabolizem pri mladih, zdravih posameznikih
Zupančič, Žan (Author), Golja, Petra (Mentor) More about this mentor... This link opens in a new window

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Abstract
Namen raziskave je bil ugotoviti vpliv zaužitja izokaloričnega visoko maščobnega obroka (VM) (64 % maščoba (M), 19 % ogljikovi hidrati (OH), 17 % beljakovine (B)) oz. obroka bogatega z ogljikovimi hidrati (VOH) (18 % M, 64 % OH, 18 % B) na oksidativni metabolizem v mirovanju in med kolesarjenjem. V raziskavo je bilo vključenih 10 zdravih mladih moških, ki so v laboratoriju opravili dve obremenitveni testiranji. Dve uri po zaužitju bodisi VOH ali VM zajtrka smo začeli z merjenjem oksidativnega metabolizma v mirovanju v ležečem položaju v obdobju 30 minut. Šest minut po zaključenem mirovanju smo oksidativni metabolizem začeli meriti med kolesarjenjem, med katerim smo obremenitev povečevali vsaki 2 minuti za 0,5 kiloponda (kp) oz. 27 Watt (W). Tako v času mirovanja, kot med kolesarjenjem med pogojema ni bilo statistično značilnih razlik v respiratornem količniku (RQ) (p = 0,484 in p = 0,106). Značilna razlika se je pokazala v najnižjem respiratornem količniku (RQ) med kolesarjenjem (VM 0,79±0,07 vs. VOH 0,85±0,10; p=0,026), ni pa bilo moč dokazati razlike med pogojema v obremenitvi, pri kateri smo izmerili najnižji RQ (p=0,18). V srčni frekvenci in oceni na Borgovi skali za mišični nivo med pogojema ni bilo statistično značilnih razlik (p = 0,539 in p = 0,237), moč pa je bilo opaziti trend k nižjim ocenam na Borgovi skali za respiratorni nivo v VOH pogoju (p=0,092). Pri primerjavi rezultatov oksidacije ogljikovih hidratov in maščobe nismo opazili statistično značilnih razlik med pogojema (p = 0,118 in p = 0,141). Prav tako ni bilo statistično značilnih razlik med pogojema v najvišji hitrosti oksidacije maščobe (Fatmax točki) (p = 0,442). Zaključimo lahko, da prehranska intervencija z VM in VOH vpliva na najnižji RQ med kolesarjenjem, nismo pa uspeli potrditi vpliva prehranske intervencije na RQ v mirovanju in na hitrost oksidacije maščobe.

Language:Slovenian
Keywords:prehrana, oksidativni metabolizem, prehranska manipulacija, sestava obroka, mirovanje, telesna dejavnost, kolesarjenje, presnova, respiratorni količnik, intenzivnost vadbe
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:BF - Biotechnical Faculty
Year:2019
Publisher:[Ž. Zupančič]
UDC:613.2+612.3:577.1:796.61
COBISS.SI-ID:5037688 This link opens in a new window
Views:842
Downloads:374
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Secondary language

Language:English
Title:Influence of meal composition on oxidative metabolism in young, healthy individuals
Abstract:
The purpose of this study was to assess influence of two isocaloric meals, the first one rich in fat (HF) (64 % fat (F), 19 % carbohydrates (CH), 17 % protein (P)), and the second rich in carbohydrates (HC) (18 % F, 64 % CH, 18 % P), on oxidative metabolism during rest and cycling. Ten healthy young male volunteers participated in two exercise tests. Two hours after the ingestion of either HF or HC breakfast oxidative metabolism was measured over a period of 30 minutes in resting supine position. Six minutes after the completion of rest, oxidative metabolism was measured during cycle ergometery, during which resistance was increased every 2 minutes for 0.5 kiloponds (kp) i.e. 27 Watt (W). We did not find any statistically significant differences in respiratory quotient (RQ), both in rest and during cycling, between HF and HC meal (p = 0.484 and p = 0.106). The lowest RQ during cycling in HC meal was significantly higher compared to HF meal (HC 0.85±0.10 vs. HF 0.79±0.07; p = 0.026), but we did not find any significant differences between the two conditions in the workload at the lowest RQ (p = 0.18). Heart rate and ratings of perceived exertion on a muscular level did not differ between the two conditions (p = 0,539 in p = 0,237), but a trend (p = 0,092) towards lower Borg ratings was observed for the respiratory level in the HC condition. No differences in highest fat oxidation velocity (Fatmax point) were observed between the two conditions (p = 0,442). In conclusion, the nutritional intervention with HF or HC meal influences the lowest RQ during cycling, but it does not influence the workload at the lowest RQ, nor the fat oxidation velocity.

Keywords:nutrition, oxidative metabolism, nutrition manipulation, meal composition, rest, physical activity, cycling, respiratory quotient, exercise intensity

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