TY - JOUR
T1 - Impact of intensive high-fat ingestion in the early stage of recovery from exercise training on substrate metabolism during exercise in humans
AU - Ichinose, Takashi
AU - Arai, Natsuko
AU - Nagasaka, Tomoaki
AU - Asano, Masaya
AU - Hashimoto, Kenji
PY - 2012
Y1 - 2012
N2 - Not only increasing body carbohydrate (CHO) stores before exercise but also suppressing CHO oxidation during exercise is important for improving endurance performance. We tested the hypothesis that intensive high-fat ingestion in the early stage of recovery from exercise training (ET) for 2 d would suppress CHO oxidation during exercise by increasing whole body lipolysis and/or fat oxidation. In a randomized crossover design, on days 1 and 2, six male subjects performed cycle ET at 50% peak oxygen consumption (VO2 peak) for 60-90 min, and consumed a control diet (CON: 1,224 kcal, 55% carbohydrate, 30% fat) or the same diet supplemented with high fat (HF: 1,974 kcal, 34% carbohydrate, 56% fat) 1 h after ET, with the diet other than post-ET similar in both trials. On day 3, subjects performed cycle exercise at 65% VO2 peak until exhaustion. Exercise time to exhaustion was longer in the HF trial than in the CON trial (CON: 48.9±6.7 vs. HF: 55.8±7.7 min, p<0.05). In the HF trial, total fat oxidation until exhaustion was higher, accompanied by higher post-exercise plasma glycerol concentration, than in the CON trial (CON: 213±54 vs. HF: 286±63 kcal, p<0.05), whereas total carbohydrate oxidation until exhaustion was not different between trials. These results suggest that intensive high-fat ingestion in the early stage of recovery from ET for a few days until the day before exercise was an effective means of eliciting a CHO-sparing effect during exercise by enhancing fat metabolism.
AB - Not only increasing body carbohydrate (CHO) stores before exercise but also suppressing CHO oxidation during exercise is important for improving endurance performance. We tested the hypothesis that intensive high-fat ingestion in the early stage of recovery from exercise training (ET) for 2 d would suppress CHO oxidation during exercise by increasing whole body lipolysis and/or fat oxidation. In a randomized crossover design, on days 1 and 2, six male subjects performed cycle ET at 50% peak oxygen consumption (VO2 peak) for 60-90 min, and consumed a control diet (CON: 1,224 kcal, 55% carbohydrate, 30% fat) or the same diet supplemented with high fat (HF: 1,974 kcal, 34% carbohydrate, 56% fat) 1 h after ET, with the diet other than post-ET similar in both trials. On day 3, subjects performed cycle exercise at 65% VO2 peak until exhaustion. Exercise time to exhaustion was longer in the HF trial than in the CON trial (CON: 48.9±6.7 vs. HF: 55.8±7.7 min, p<0.05). In the HF trial, total fat oxidation until exhaustion was higher, accompanied by higher post-exercise plasma glycerol concentration, than in the CON trial (CON: 213±54 vs. HF: 286±63 kcal, p<0.05), whereas total carbohydrate oxidation until exhaustion was not different between trials. These results suggest that intensive high-fat ingestion in the early stage of recovery from ET for a few days until the day before exercise was an effective means of eliciting a CHO-sparing effect during exercise by enhancing fat metabolism.
KW - Exercise
KW - High fat
KW - Lipolysis
KW - Training
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U2 - 10.3177/jnsv.58.354
DO - 10.3177/jnsv.58.354
M3 - Article
C2 - 23327971
AN - SCOPUS:84872722205
VL - 58
SP - 354
EP - 359
JO - The Journal of vitaminology
JF - The Journal of vitaminology
SN - 0301-4800
IS - 5
ER -