Påfyllning av lever- & muskelglykogen av maltodextrin, galaktos, protein & aminosyror

[King Grub]

The present study evaluated whether the inclusion of protein (PRO) and amino acids (AA) within a maltodextrin (MD) and galactose (GAL) recovery drink enhanced post-exercise liver and muscle glycogen repletion. A total of seven trained male cyclists completed two trials, separated by 7 d. Each trial involved 2 h of standardised intermittent cycling, followed by 4 h recovery. During recovery, one of two isoenergetic formulations, MD-GAL (0·9 g MD/kg body mass (BM) per h and 0·3 g GAL/kg BM per h) or MD-GAL-PRO+AA (0·5 g MD/kg BM per h, 0·3 g GAL/kg BM per h, 0·4 g whey PRO hydrolysate plus l-leucine and l-phenylalanine/kg BM per h) was ingested at every 30 min. Liver and muscle glycogen were measured after depletion exercise and at the end of recovery using 1H-13C-magnetic resonance spectroscopy. Despite higher postprandial insulin concentations for MD-GAL-PRO+AA compared with MD-GAL (61·3 (se 6·2) v. 29·6 (se 3·0) mU/l, (425·8 (se 43·1) v. 205·6 (se 20·8) pmol/l) P= 0·03), there were no significant differences in post-recovery liver (195·3 (se 2·6) v. 213·8 (se 18·0) mmol/l) or muscle glycogen concentrations (49·7 (se 4·0) v. 51·1 (se 7·9) mmol/l). The rate of muscle glycogen repletion was significantly higher for MD-GAL compared with MD-GAL-PRO+AA (5·8 (se 0·7) v. 3·7 (se 0·6) mmol/l per h, P= 0·04), while there were no significant differences in the rate of liver glycogen repletion (15·0 (se 2·5) v. 13·0 (se 2·7) mmol/l per h). PRO and AA within a MD-GAL recovery drink, compared with an isoenergetic mix of MD-GAL, did not enhance but matched liver and muscle glycogen recovery. This suggests that the increased postprandial insulinaemia only compensated for the lower MD content in the MD-GAL-PRO+AA treatment.

Br J Nutr. 2013 Feb 6:1-8. Liver and muscle glycogen repletion using 13C magnetic resonance spectroscopy following ingestion of maltodextrin, galactose, protein and amino acids.