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Glycogen Replenishment with Chocolate Milk Consumption

Saunders, Michael John PhD, FACSM

doi: 10.1249/JSR.0b013e318237c0ed
Letters to the Editor

James Madison University Harrisonburg, VA


Dear Editor-in-Chief:

I am writing regarding an error that appeared in my recent article, "Carbohydrate-Protein Intake and Recovery from Endurance Exercise: Is Chocolate Milk the Answer?" (2). In this topical review, I cited a study from Ferguson-Stegall et al. (1), stating that "glycogen resynthesis... with chocolate milk intake (30.6 μmol·g−1 w.w.) tended to be greater than when an isocaloric carbohydrate beverage was consumed (23.6 μmol·g−1 w.w.), although there was no statistically significant difference between treatments (P = 0.06)" (p. 204). The mean values reported above were reversed for the respective treatments. Therefore, the glycogen replenishment values in this study actually tended to be higher with carbohydrate intake versus chocolate milk (P = 0.06). However, the review correctly states (p. 207) that chocolate milk intake resulted in significantly faster performance in a subsequent 40-km time trial compared with an isocaloric carbohydrate beverage or placebo (1).

In summarizing the effects of chocolate milk on glycogen resynthesis, I stated that it "seems logical that chocolate milk may promote glycogen resynthesis at rates that are similar or possibly higher than calorically matched carbohydrate beverages" (p. 204). While I believe this statement remains true, the few studies that have investigated this hypothesis are more equivocal than indicated in the article. I regret the error.

Michael John Saunders, PhD, FACSM

James Madison University

Harrisonburg, VA


The author has received prior research funding from the National Dairy Council, and from sports nutrition corporations. He has served on a scientific advisory committee for the National Dairy Council, and has received fees and travel reimbursement for work related to this role.

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1. Ferguson-Stegall L, McCleave EL, Ding Z, et al. Postexercise carbohydrate-protein supplementation improves subsequent exercise performance and intracellular signaling for protein synthesis. J. Strength Cond. Res. 2011; 25:1210-24.
2. Saunders MJ. Carbohydrate-protein intake and recovery from endurance exercise: is chocolate milk the answer? Curr. Sports Med. Rep. 2011; 10:203-10.
© 2011 American College of Sports Medicine