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Protein Supplementation Does Not Affect Myogenic Adaptations to Resistance Training
Paul T Reidy1, Christopher S Fry, Sherry Igbinigie
11Division of Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX; 2Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, TX; 3School of Medicine, University of Texas Medical Branch, Galveston, TX; 4Sealy Center on Aging, University of Texas Medical Branch, Galveston, TX; 5Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX; 6DuPont Nutrition and Health, St. Louis, MO.
Protein supplementation during resistance training offers modest gains in whole-body lean mass but does not significantly enhance muscle hypertrophy or cellular adaptations. Adequate protein intake is key for muscle growth during exercise.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Muscle Biology
Background:
- Resistance training is known to stimulate muscle hypertrophy, involving satellite cell activation and myonuclear accretion.
- The role of protein supplementation in augmenting these training-induced adaptations remains a key area of investigation.
Purpose of the Study:
- To investigate the efficacy of soy-dairy protein blend versus whey protein isolate supplementation on muscle hypertrophy and cellular adaptations during resistance training.
- To compare the effects of different protein types against a placebo in healthy young men undergoing resistance exercise.
Main Methods:
- Healthy young men underwent 12 weeks of supervised whole-body resistance training.
- Participants were randomized to ingest a daily 22g dose of soy-dairy protein blend, whey protein isolate, or a maltodextrin placebo.
- Muscle biopsies were analyzed for myofiber cross-sectional area, satellite cell content, and myonuclear addition.
Main Results:
- Protein supplementation (both blend and whey combined) showed a modest, statistically borderline, increase in whole-body lean mass compared to placebo.
- No significant differences were observed in myofiber hypertrophy, satellite cell content, or myonuclear addition between protein groups and placebo.
- Resistance training alone increased satellite cell and myonuclei content in both myosin heavy chain I and II fibers.
Conclusions:
- Protein supplementation during resistance training has a limited impact on muscle hypertrophy and cellular adaptations in young healthy men.
- The type of protein supplement (soy-dairy blend vs. whey isolate) did not yield differential effects on the measured outcomes.
- Adequate protein intake, rather than specific supplementation, appears sufficient for optimizing muscle adaptations when combined with resistance exercise.
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