Fuel for the work required: a practical approach to amalgamating train-low paradigms for endurance athletes

Using an amalgamation of previously studied train-low paradigms, we tested the effects of reduced carbohydrate (CHO) but high leucine availability on cell-signaling responses associated with exercise-induced regulation of mitochondrial biogenesis and muscle protein synthesis (MPS). In a repeated-measures crossover design, 11 males completed an exhaustive cycling protocol with high CHO availability before, during, and after exercise (HIGH) or alternatively, low CHO but high protein (leucine enriched) availability (LOW + LEU). Muscle glycogen was different (P < 0.05) pre-exercise (HIGH: 583 (-1)58, LOW + LEU: 271 +/- 85 mmol kg(-1) dw) but decreased (P < 0.05) to comparable levels at exhaustion ((-1)00 mmol kg (-1) dw). Despite differences (P < 0.05) in exercise capacity (HIGH: 158 +/- 29, LOW + LEU: 100 (-1)7 min), exercise induced (P < 0.05) comparable AMPKa2 (3-4-fold) activity, PGC-1a (13-fold), p53 (2-fold), Tfam (1.5-fold), SIRT1 (1.5-fold), Atrogin 1 (2-fold), and MuRF1 (5-fold) gene expression at 3 h post-exercise. Exhaustive exercise suppressed p70S6K activity to comparable levels immediately post-exercise (+/- 20 fmol min (-1) mg +/- 1). Despite elevated leucine availability post-exercise, p70S6K activity remained suppressed (P < 0.05) 3 h postexercise in LOW + LEU (28 (-1)4 fmol min (-1) mg +/- 1), whereas muscle glycogen resynthesis (40 mmol kg (-1) dw h +/- 1) was associated with elevated (P < 0.05) p70S6K activity in HIGH (53 +/- 30 fmol min (-1) mg(-1)). We conclude: (1) CHO restriction before and during exercise induces work-efficient mitochondrial-related cell signaling but; (2) post-exercise CHO and energy restriction maintains p70S6K activity at basal levels despite feeding leucineenriched protein. Our data support the practical concept of fuelling for the work required as a potential strategy for which to amalgamate train-low paradigms into periodized training programs.