Eur J Appl Physiol Occup Physiol. 1994;69(4):287-93.
Enhanced endurance in trained cyclists during moderate intensity exercise following 2 weeks adaptation to a high fat diet.
Lambert EV, Speechly DP, Dennis SC, Noakes TD.
Liberty Life Chair of Exercise and Sports Science, University of Cape Town Medical School, Observatory, South Africa.
These studies investigated the effects of 2 weeks of either a high-fat (HIGH-FAT: 70% fat, 7% CHO) or a high-carbohydrate (HIGH-CHO: 74% CHO, 12% fat) diet on exercise performance in trained cyclists (n = 5) during consecutive periods of cycle exercise including a Wingate test of muscle power, cycle exercise to exhaustion at 85% of peak power output [90% maximal oxygen uptake (VO2max), high-intensity exercise (HIE)] and 50% of peak power output [60% VO2max, moderate intensity exercise (MIE)]. Exercise time to exhaustion during HIE was not significantly different between trials: nor were the rates of muscle glycogen utilization during HIE different between trials, although starting muscle glycogen content was lower [68.1 (SEM 3.9) vs 120.6 (SEM 3.

mmol.kg-1 wet mass, P < 0.01] after the HIGH-FAT diet. Despite a lower muscle glycogen content at the onset of MIE [32 (SEM 7) vs 73 (SEM 6) mmol.kg-1 wet mass, HIGH-FAT vs HIGH-CHO, P < 0.01], exercise time to exhaustion during subsequent MIE was significantly longer after the HIGH-FAT diet [79.7 (SEM 7.6) vs 42.5 (SEM 6.

min, HIGH-FAT vs HIGH-CHO, P < 0.01]. Enhanced endurance during MIE after the HIGH-FAT diet was associated with a lower respiratory exchange ratio [0.87 (SEM 0.03) vs (SEM 0.02), P < 0.05], and a decreased rate of carbohydrate oxidation [1.41 (SEM 0.70) vs 2.23 (SEM 0.40) g CHO.min-1, P < 0.05].(ABSTRACT TRUNCATED AT 250 WORDS)
Eli:
Vaikka glykogeenitankit olivatkin pienemmät, väsymys tuli korkeassakin rasituksessa (90% VO2max) samoihin aikoihin vähähiilarisella korkearasvasella ruokavaliolla. Kestävyysrasitusharjoittelu parani vähähiilarisella.
Edelleen, ongelma vähähiilarisella luultavimmin on "ammatti"urheilijoilla, jotka vetää monta treeniä päivässä ja oikeasti saavat glykogeenit liian vähiin. Perusjamppa ei sitä lienee onnistu tekemään. Ja näiden "ammatti"urheilijoidenkin hiilarintarve kohdennetulla palautushiilareilla jäänee paljon vähäisemmäksi, kuin mitä nykyään kuvitellaan tarvittavan. Siis jos peruspohjana on vähähiilarinen, ja käyttää palautushiilareita jos vetää karmeeta treeniä, niin kokonaismääristä ei taida juurikaan olla vielä tutkimustietoa.