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The Effects of Feeding Protein Hydrolysate Versus Carbohydrate on Athletic Performance and Perceived Exertion in Trained Glycogen‐depleted Athletes.
Author(s) -
Kalman Douglas,
Krieger Diane,
Antonio Jose,
Tanasescu Mihaela,
Lou Lidia
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.2_supplement.684
Subject(s) - hydrolysate , glycogen , carbohydrate , exertion , athletes , crossover study , zoology , perceived exertion , medicine , chemistry , endocrinology , physical therapy , biochemistry , biology , placebo , heart rate , alternative medicine , pathology , blood pressure , hydrolysis
PURPOSE: This randomized, double‐blind, crossover study tested the effects of 3 isocaloric drinks of varying macronutrient composition on muscular endurance and strength 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; carbohydrate [CHO], protein [PRO (casein hydrolysate], or a combination [MIX (2:1 ratio of PRO to CHO)]. The test products contained 45 grams of CHO, PRO or PRO + CHO. Test visits, preceded by a low‐CHO diet for 24 hours, included 15 sets of leg extensions to induce glycogen depletion (5 sets of 10 reps at 30/45/60% of 1‐RM load), a 20‐minute rest during which product was consumed, and 3 sets of leg extensions to failure at 70% of 1‐RM load. The Borg scale was used to assess perceived exertion (RPE). RESULTS: There was no difference in exercise performance between test groups (p=0.612). Nor was there a difference in RPE (p=0.199). When examining the data within each group for changes over time both the PRO and MIX groups exhibited no change, but the CHO group tended to perform less repetitions over time (p=0.056). CONCLUSION: Supplementing glycogen depleted athletes with casein hydrolysate alone or combined in a 2:1 ratio (PRO+CHO) supports athletic performance to the same degree as CHO alone.