No Difference Between Spray Dried Milk and Native Whey Supplementation with Strength Training

Background A rapid digestibility and high leucine content are considered important for maximal stimulation of muscle protein synthesis. Consequently, with these properties, native whey may hold greater anabolic potential than milk, when supplemented in combination with strength training. Our aim was to compare the effects of supplementation with milk or native whey, during a 12-week strength training period, on gains in muscle mass and strength in young adults. Methods In this double-blinded, randomized, controlled study a total of 40 untrained young men and women received two daily servings of either milk or native whey containing 20 g of protein, during a 12-week strength training intervention. Muscle strength, lean mass, thigh muscle cross sectional area, m. vastus lateralis thickness and muscle fiber cross sectional area were assessed before and after the training period. In addition, the acute phosphorylation of the anabolic kinases p70S6K, 4E-BP1 and eEF-2 in response to a standardized workout and supplementation was investigated before and after the 12-week training period. Results Muscle mass and strength increased, by all measures applied (5-16%, P 0.25). p70S6K phosphorylation increased (~1000%, P 0.40). No correlation between these acute measures and changes in muscle mass or strength were observed. Conclusion Supplementation with milk or native whey during a 12-week strength training period did not differentially affect muscle mass and strength in young untrained individuals. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. Correspondence to: Håvard Hamarsland, Department of Physical Performance, Norwegian School of Sport Sciences, P.O. Box 4014 Ullevål Stadion, 0806 Oslo, Norway, Tel: +47 93445916. Havard.hamarsland@gmail.com The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation. The results of the present study do not constitute endorsement by ACSM. Financial support: TINE SA funded the study. TINE SA was not involved in design of the study, data collection, analyses, interpretation of data or writing of the manuscript. Disclosures: The authors declare no conflict of interest. Submitted for publication April 2018. Accepted for publication August 2018. © 2018 American College of Sports Medicine

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