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The Effects of Feeding Protein Hydrolysate vs Carbohydrate on Biochemical Markers of Anabolism and Catabolism in Trained Glycogen‐Depleted Athletes

PURPOSE: This RDBCT w/crossover study investigated the effects of 3 isocaloric beverages on markers of anabolism and catabolism in glycogen depleted active males. METHODS: 8 healthy males (18–40 y.o.) with a minimum of 6 months RT experience, participated in 3 exercise test visits at which test drinks were provided in random order; 45 gm carbohydrate (CHO), 45 gm protein [PRO (casein hydrolysate)], or a combination [MIX (2:1 ratio of 30 gm PRO to 15 gmCHO)]. Test visits, preceded by a run‐in low‐CHO diet for 24 hours, included 15 sets of leg extensions for glycogen depletion (5 sets of 10 reps at 30, 45, and 60% of 1‐RM load), a 20‐minute rest during which product was consumed, and 3 sets of leg ext to failure at 70% of 1‐RM. Biochemical markers of anabolism (GLU, LEU, PHE) & catabolism (lactate, CPK, LDH) were collected during & at 2 & 10 min post‐exercise. RESULTS: There were no comparative differences between the test groups with respect to lactate, LEU, PHE, CPK, or LDH. Glucose was significantly different between groups (glucose values for the CHO group increased over time; p=0.027). The MIX group experienced a significant rise in LEU post‐ingestion and throughout the post‐exercise testing period (p=0.012 and 0.038 respectively). CONCLUSION: Supplementing glycogen‐depleted athletes with casein hydrolysate alone or combined in a 2:1 ratio with carbohydrate may support markers of anabolism to a greater degree than CHO alone.