The effects of an acute "train-low" nutritional protocol on markers of recovery otpimization in endurance-trained male athletes
Journal article
Russo, Isabella, Della Gatta, Paul A., Garnham, Andrew, Porter, Judi, Burke, Louise M. and Costa, Ricardo J. S.. (2021). The effects of an acute "train-low" nutritional protocol on markers of recovery otpimization in endurance-trained male athletes. International Journal of Sports Physiology and Performance. 16(12), pp. 1764-1776. https://doi.org/10.1123/ijspp.2020-0847
Authors | Russo, Isabella, Della Gatta, Paul A., Garnham, Andrew, Porter, Judi, Burke, Louise M. and Costa, Ricardo J. S. |
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Abstract | Purpose: This study aimed to determine the effects of an acute “train-low” nutritional protocol on markers of recovery optimization compared to standard recovery nutrition protocol. Methods: After completing a 2-hour high-intensity interval running protocol, 8 male endurance athletes consumed a standard dairy milk recovery beverage (CHO; 1.2 g/kg body mass [BM] of carbohydrate and 0.4 g/kg BM of protein) and a low-carbohydrate (L-CHO; isovolumetric with 0.35 g/kg BM of carbohydrate and 0.5 g/kg BM of protein) dairy milk beverage in a double-blind randomized crossover design. Venous blood and breath samples, nude BM, body water, and gastrointestinal symptom measurements were collected preexercise and during recovery. Muscle biopsy was performed at 0 hour and 2 hours of recovery. Participants returned to the laboratory the following morning to measure energy substrate oxidation and perform a 1-hour distance test. Results: The exercise protocol resulted in depletion of muscle glycogen stores (250 mmol/kg dry weight) and mild body-water losses (BM loss = 1.8%). Neither recovery beverage replenished muscle glycogen stores (279 mmol/kg dry weight) or prevented a decrease in bacterially stimulated neutrophil function (−21%). Both recovery beverages increased phosphorylation of mTORSer2448 (main effect of time = P < .001) and returned hydration status to baseline. A greater fold increase in p-GSK-3βSer9/total-GSK-3β occurred on CHO (P = .012). Blood glucose (P = .005) and insulin (P = .012) responses were significantly greater on CHO (618 mmol/L per 2 h and 3507 μIU/mL per 2 h, respectively) compared to L-CHO (559 mmol/L per 2 h and 1147 μIU/mL per 2 h, respectively). Rates of total fat oxidation were greater on CHO, but performance was not affected. Conclusion: A lower-carbohydrate recovery beverage consumed after exercise in a “train-low” nutritional protocol does not negatively impact recovery optimization outcomes. |
Keywords | carbohydrate; glycogen; protein; hydration; gastrointestinal; immune |
Year | 2021 |
Journal | International Journal of Sports Physiology and Performance |
Journal citation | 16 (12), pp. 1764-1776 |
Publisher | Human Kinetics Publishers |
ISSN | 1555-0265 |
Digital Object Identifier (DOI) | https://doi.org/10.1123/ijspp.2020-0847 |
Scopus EID | 2-s2.0-85123288473 |
Research or scholarly | Research |
Page range | 1764-1776 |
Funder | Lion Dairy & Drink Australia Pty Ltd |
Monash University | |
Publisher's version | License All rights reserved File Access Level Controlled |
Output status | Published |
Publication dates | |
Online | 27 May 2021 |
Publication process dates | |
Deposited | 25 Aug 2022 |
https://acuresearchbank.acu.edu.au/item/8y2y1/the-effects-of-an-acute-train-low-nutritional-protocol-on-markers-of-recovery-otpimization-in-endurance-trained-male-athletes
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