| Summary: | A variety of dietary choices are marketed to enhance glycogen recovery after physical activity. Past research provides recommendations regarding the timing, dose, and nutrient compositions to facilitate glycogen resynthesis. This study examined the effects of isocaloric sport supplements (SS) vs fast-food (FF) on glycogen resynthesis and exercise performance. Eleven male 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±0.27 g.kg-1 carbohydrate, 0.24±0.04 g.kg-1 fat, and 0.18±0.03 g.kg-1 protein) 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 obtained at 0, 30, 60, 120, 150, 180, and 240 minutes post exercise for insulin, glucose and blood lipids. 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 resynthesis were not different across the diets (6.9±1.7 and 7.9±2.4 mmol·kg-1·h-1 for SS and FF, respectively). There were also no differences across the diets for TT performance (34.1±1.8 and 34.3±1.7 minutes for SS and FF, respectively. These data indicate that short-term food options to initiate glycogen resynthesis can include a wide range of dietary options when total macronutrient composition is balanced.
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