Mean TTE was similar between conditions (KB: 55 ± 25 vs. 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. Steady-state treadmill pace was set at 3.2 km/h (0.89 m/s) and 14% grade. The rucksack weight was standardized to 30% of bodyweight. Conditions were separated by a 1-week washout. 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. 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. Rucksack marches (‘rucks’) are strenuous, military-relevant exercises that may benefit from pre-event fuelling. Novel ketogenic nutrition bars may have military-relevant applications to lessen carry load without compromising exercise capacity. This proof-of-concept study is the first to demonstrate that carbohydrate bars and lipid bars are equally feasible for preserving ruck performance. What is the main finding and its importance?Īcute ingestion of either nutritional bar sustained ∼1 h of exhaustive rucking with a 30% of body weight rucksack. What is the central question of the study?Ĭan a novel, energy-dense and lightweight ketogenic bar (1000 kcal) consumed 3 h before exercise modulate steady-state incline rucksack march (‘ruck’) performance compared to isocaloric carbohydrate bars in recreationally active, college-aged men?
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