Maryam Pourabbas1, Reza Bagheri2, Babak Hooshmand Moghadam3, Darryn S Willoughby4, Darren G Candow5, Bradley T Elliott6, Scott C Forbes7, Damoon Ashtary-Larky8, Mozhgan Eskandari9, Alexei Wong10, Frédéric Dutheil11,12. 1. Department of Exercise Physiology, University of Tehran, Tehran 1961733114, Iran. 2. Department of Exercise Physiology, University of Isfahan, Isfahan 81746-73441, Iran. 3. Department of Exercise Physiology, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran. 4. School of Exercise and Sport Science, University of Mary Hardin-Baylor, Belton, TX 76513, USA. 5. Faculty of Kinesiology and Health Studies, University of Regina, Regina, SK S4SOA2, Canada. 6. Translational Physiology Research Group, School of Life Sciences, University of Westminster, London WC2N 5DU, UK. 7. Department of Physical Education, Faculty of Education, Brandon University, Brandon, MB R7A6A9, Canada. 8. Nutrition and Metabolic Diseases Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-15794, Iran. 9. Department of Exercise Physiology, University of Birjand, Birjand 9717434765, Iran. 10. Department of Health and Human Performance, Marymount University, Arlington, VA 22207, USA. 11. Physiological and Psychosocial Stress, CNRS, LaPSCo, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France. 12. Preventive and Occupational Medicine, Witty Fit, University Hospital of Clermont-Ferrand, CHU Clermont, F-63000 Clermont-Ferrand, France.
Abstract
BACKGROUND: We evaluated the effects of high-protein dairy milk ingestion on changes in body composition, strength, power, and skeletal muscle regulatory markers following 6 weeks of resistance training in trained young males. METHODS:Thirty resistance-trained young males (age: 27 ± 3 years; training experience: 15 ± 2 months) were randomly assigned to one of two groups: high-protein dairy milk (both whey and casein) + resistance training (MR; n = 15) or isoenergetic carbohydrate (maltodextrin 9%) + resistance training (PR; n = 15). Milk and placebo were ingested immediately post-exercise (250 mL; 30 g protein) and 30 min before sleep (250 mL; 30 g protein). Before and after 6 weeks of linear periodized resistance training (4 times/week), body composition (bioelectrical impedance), strength, power, and serum levels of skeletal muscle regulatory markers (insulin-like growth factor 1 (IGF-1), growth hormone, testosterone, cortisol, follistatin, myostatin, and follistatin-myostatin ratio) were assessed. RESULTS: The MR group experienced a significantly higher (p < 0.05) increase in lean mass, strength, and power (upper- and lower-body) than the PR group. Further, IGF-1, growth hormone, testosterone, follistatin, and follistatin-myostatin ratio were significantly increased, while cortisol and myostatin significantly decreased in the MR group than the PR group (p < 0.05). CONCLUSIONS: The strategic ingestion of high-protein dairy milk (post-exercise and pre-sleep) during 6 weeks of resistance training augmented lean mass, strength, power, and altered serum concentrations of skeletal muscle regulatory markers in trained young males compared to placebo.
RCT Entities:
BACKGROUND: We evaluated the effects of high-protein dairy milk ingestion on changes in body composition, strength, power, and skeletal muscle regulatory markers following 6 weeks of resistance training in trained young males. METHODS: Thirty resistance-trained young males (age: 27 ± 3 years; training experience: 15 ± 2 months) were randomly assigned to one of two groups: high-protein dairy milk (both whey and casein) + resistance training (MR; n = 15) or isoenergetic carbohydrate (maltodextrin 9%) + resistance training (PR; n = 15). Milk and placebo were ingested immediately post-exercise (250 mL; 30 g protein) and 30 min before sleep (250 mL; 30 g protein). Before and after 6 weeks of linear periodized resistance training (4 times/week), body composition (bioelectrical impedance), strength, power, and serum levels of skeletal muscle regulatory markers (insulin-like growth factor 1 (IGF-1), growth hormone, testosterone, cortisol, follistatin, myostatin, and follistatin-myostatin ratio) were assessed. RESULTS: The MR group experienced a significantly higher (p < 0.05) increase in lean mass, strength, and power (upper- and lower-body) than the PR group. Further, IGF-1, growth hormone, testosterone, follistatin, and follistatin-myostatin ratio were significantly increased, while cortisol and myostatin significantly decreased in the MR group than the PR group (p < 0.05). CONCLUSIONS: The strategic ingestion of high-protein dairy milk (post-exercise and pre-sleep) during 6 weeks of resistance training augmented lean mass, strength, power, and altered serum concentrations of skeletal muscle regulatory markers in trained young males compared to placebo.
Entities:
Keywords:
body composition; endocrine; hypertrophy; milk; resistance training
Authors: W J Kraemer; L Marchitelli; S E Gordon; E Harman; J E Dziados; R Mello; P Frykman; D McCurry; S J Fleck Journal: J Appl Physiol (1985) Date: 1990-10
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