Metabolic and ruck performance effects of a novel, light‐weight, energy‐dense ketogenic bar

Autor: Alex Buga, Chris D. Crabtree, Justen T. Stoner, Drew D. Decker, Bradley T. Robinson, Madison L. Kackley, Teryn N. Sapper, Jeffrey D. Buxton, Dominic P. D'Agostino, Tyler S. McClure, Anthony Berardi, Shawn Cline, Trevor Fleck, Jared Krout, Doran Newby, Andrew P. Koutnik, Jeff S. Volek, Philip J. Prins
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Experimental Physiology, Vol 108, Iss 5, Pp 715-727 (2023)
Druh dokumentu: article
ISSN: 1469-445X
0958-0670
DOI: 10.1113/EP091029
Popis: Abstract Rucksack marches (‘rucks’) are strenuous, military‐relevant exercises that may benefit from pre‐event fuelling. The purpose of this investigation was to explore whether acute ingestion of carbohydrate‐ or lipid‐based nutritional bars before rucking can elicit unique advantages that augment exercise performance. Recreationally active and healthy males (n = 29) were randomized and counterbalanced to consume 1000 kcal derived from a novel, energy‐dense (percentage energy from carbohydrate/fat/protein: 5/83/12) ketogenic bar (KB), or isocaloric high‐carbohydrate bars (CB; 61/23/16) 3 h before a time‐to‐exhaustion (TTE) ruck. Conditions were separated by a 1‐week washout. The rucksack weight was standardized to 30% of bodyweight. Steady‐state treadmill pace was set at 3.2 km/h (0.89 m/s) and 14% grade. TTE was the primary outcome; respiratory exchange ratio (RER), capillary ketones (R‐β‐hydroxybutyrate), glucose and lactate, plus subjective thirst/hunger were the secondary outcomes. Mean TTE was similar between conditions (KB: 55 ± 25 vs. CB: 54 ± 22 min; P = 0.687). The RER and substrate oxidation rates revealed greater fat and carbohydrate oxidation after the KB and CB, respectively (all P
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