| Title: |
The Effects of an Acute 'Train-Low' Nutritional Protocol on Markers of Recovery Optimization in Endurance-Trained Male Athletes |
| Authors: |
I Russo; PA Della Gatta; Andrew Garnham; Judi Porter; LM Burke; RJS Costa |
| Publication Year: |
2021 |
| Subject Terms: |
Medical physiology not elsewhere classified; Sports science and exercise not elsewhere classified; Other psychology not elsewhere classified; Science & Technology; Life Sciences & Biomedicine; Physiology; Sport Sciences; carbohydrate; glycogen; protein; hydration; gastrointestinal; immune; INDUCED GASTROINTESTINAL SYNDROME; CARBOHYDRATE-PROTEIN INGESTION; SKELETAL-MUSCLE ADAPTATION; EXERTIONAL-HEAT STRESS; GLYCOGEN AVAILABILITY; RESISTANCE EXERCISE; SYSTEMIC ENDOTOXIN; PERFORMANCE; SYMPTOMS; IMPACT; 4207 Sports science and exercise |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| Relation: |
http://hdl.handle.net/10536/DRO/DU:30152149 |
| Availability: |
http://hdl.handle.net/10536/DRO/DU:30152149; https://figshare.com/articles/journal_contribution/The_Effects_of_an_Acute_Train-Low_Nutritional_Protocol_on_Markers_of_Recovery_Optimization_in_Endurance-Trained_Male_Athletes/20661687 |
| Rights: |
All Rights Reserved |
| Accession Number: |
edsbas.3C6726B0 |
| Database: |
BASE |