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Timing of post-resistance exercise nutrient ingestion: effects on gastric emptying and glucose and amino acid responses in humans

  • Hideaki Kashima (a1), Kana Sugimura (a1), Kana Taniyawa (a1), Rumi Kondo (a1), Masako Yamaoka Endo (a1), Shota Tanimoto (a1), Toshio Kobayashi (a2), Akira Miura (a1) and Yoshiyuki Fukuba (a1)...
Abstract

This study examined the effects of post-resistance exercise protein ingestion timing on the rate of gastric emptying (GE) and blood glucose (BG) and plasma branched-chain amino acid (BCAA) responses. In all, eleven healthy participants randomly ingested 400 ml of a nutrient-rich drink containing 12 g carbohydrates and 20 g protein at rest (Con), at 5 min (post-exercise (PE)-5) or at 30 min (PE-30) after a single bout of strenuous resistance exercises. The first and second sets comprised ten repetitions at 50 % of each participant’s one-repetition maximum (1RM). The third, fourth and fifth sets comprised ten repetitions at 75 % of 1RM, and the sixth set involved repeated repetitions until exhaustion. Following ingestion of the nutrient-rich drink, we assessed the GE rate using 13C-sodium acetate breath test and evaluated two parameters according to the Tmax-calc (time when the recovery per hour is maximised), which is a standard analytical method, and T1/2 (time when the total cumulative dose of [13CO2] reaches one-half). Tmax-calc and T1/2 were slower for the PE-5 condition than for either the PE-30 or Con condition (Tmax-calc; Con: 53 (sd 7) min, PE-5: 83 (sd 16) min, PE-30: 62 (sd 9) min, T1/2; Con: 91 (sd 7) min, PE-5: 113 (sd 21) min, PE-30: 91 (sd 11) min, P<0·05). BG and BCAA responses were also slower for the PE-5 condition than for either the PE-30 or Con condition. Ingesting nutrients immediately after strenuous resistance exercise acutely delayed GE, which affected BG and plasma BCAA levels in blood circulation.

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Corresponding author
*Corresponding author: Y. Fukuba, fax +81 82 251 9806, email fukuba@pu-hiroshima.ac.jp
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British Journal of Nutrition
  • ISSN: 0007-1145
  • EISSN: 1475-2662
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