Int J Sport Nutr Exerc Metab. 2015 Mar 26. [Epub ahead of print]
Post-exercise Glycogen Recovery and Exercise Performance is Not Significantly Different Between Fast Food and Sport Supplements.
Cramer MJ1, Dumke CL, Hailes WS, Cuddy JS, Ruby BC.
A variety of dietary choices are marketed to enhance glycogen recovery after physical activity. Past research informs recommendations regarding the timing, dose, and nutrient compositions to facilitate glycogen recovery. This study examined the effects of isoenergetic sport supplements (SS) vs. fast food (FF) on glycogen recovery and exercise performance. Eleven males completed two experimental trials in a randomized, counterbalanced order. Each trial included a 90-minute glycogen depletion ride followed by a 4-hour recovery period. Absolute amounts of macronutrients (1.54 Â± 0.27 gÂ·kg-1 carbohydrate, 0.24 Â± 0.04 gÂ·kg fat-1, and 0.18 Â± 0.03gÂ·kg protein-1) as either SS or FF were provided at 0 and 2 hours. Muscle biopsies were collected from the vastus lateralis at 0 and 4 hours post exercise. Blood samples were analyzed at 0, 30, 60, 120, 150, 180, and 240 minutes post exercise for insulin and glucose, with blood lipids analyzed at 0 and 240 minutes. A 20k time-trial (TT) was completed following the final muscle biopsy. There were no differences in the blood glucose and insulin responses. Similarly, rates of glycogen recovery were not different across the diets (6.9 Â± 1.7 and 7.9 Â± 2.4 mmolÂ·kg wet weight- 1Â·hr-1 for SS and FF, respectively). There was also no difference across the diets for TT performance (34.1 Â± 1.8 and 34.3 Â± 1.7 minutes for SS and FF, respectively. These data indicate that short-term food options to initiate glycogen resynthesis can include dietary options not typically marketed as sports nutrition products such as fast food menu items.