Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation
Joy JM, Vogel RM, Shane Broughton K, Kudla U, Kerr NY
Published in Journal of the International Society of Sports Nutrition
Methodology
Ten-week randomized supervised resistance training trial comparing 35 g daily casein taken during the day versus before sleep, with diets standardised to 1.8 g protein/kg
Key Findings
Both daytime and nighttime casein groups significantly increased lean soft tissue, muscle cross-sectional area and leg press and bench press strength, with no differences between timing groups.
Conclusions
Total daily casein intake, not timing, drove hypertrophy and strength gains when protein intake was already adequate.
Limitations
Very small sample (13 trained males), no protein-free control group, preliminary design.
Supplements Studied
Both groups increased (p < 0.05) in lean soft tissue, cross-sectional area and strength in the leg press and bench press with no difference between groups.
Outcomes Measured
Both groups increased (p < 0.05) in lean soft tissue, cross-sectional area and strength in the leg press and bench press with no difference between groups.
Study Details
Access Study
Disclosures
Funding
Supplement industry involvement reported (author affiliation with FrieslandCampina)
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