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Journal of the International Society of Sports Nutrition

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Open Access 01-12-2018 | Research article

Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation

Authors: Jordan M. Joy, Roxanne M. Vogel, K. Shane Broughton, Urszula Kudla, Nathaniel Y. Kerr, Jason M. Davison, Robert E. C. Wildman, Nancy M. DiMarco

Published in: Journal of the International Society of Sports Nutrition | Issue 1/2018

Abstract

Background

Casein protein consumed before sleep has been suggested to offer an overnight supply of exogenous amino acids for anabolic processes. The purpose of this study was to compare supplemental casein consumed earlier in the day (DayTime, DT) versus shortly before bed (NightTime, NT) on body composition, strength, and muscle hypertrophy in response to supervised resistance training.

Methods

Thirteen males participated in a 10-week exercise and dietary intervention while receiving 35 g casein daily. Isocaloric diets provided 1.8 g protein/kg body weight.

Results

Both groups increased (p < 0.05) in lean soft tissue (DT Pre: 58.3 ± 10.3 kg; DT Post: 61.1 ± 11.1 kg; NT Pre: 58.3 ± 8.6 kg; NT Post: 60.3 ± 8.2 kg), cross-sectional area (CSA, DT Pre: 3.4 ± 1.5 cm2; DT Post: 4.1 ± 1.7 cm2; NT Pre: 3.3 ± 1.6 cm2; NT Post: 3.7 ± 1.6 cm2) and strength in the leg press (DT Pre: 341 ± 87.3 kg; DT Post: 421.1 ± 94.0 kg; NT Pre: 450.0 ± 180.3 kg; NT Post: 533.9 ± 155.4 kg) and bench press (DT Pre: 89.0 ± 27.0 kg; DT Post: 101.0 ± 24.0 kg; NT Pre 100.8 ± 32.4 kg; NT Post: 109.1 ± 30.4 kg) with no difference between groups in any variable (p > 0.05).

Conclusions

Both NT and DT protein consumption as part of a 24-h nutrition approach are effective for increasing strength and hypertrophy. The results support the strategy of achieving specific daily protein levels versus specific timing of protein ingestion for increasing muscle mass and performance.

Trial registration

ClinicalTrials.gov Identifier: NCT03352583.

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Title: Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation
Authors: Jordan M. Joy
Roxanne M. Vogel
K. Shane Broughton
Urszula Kudla
Nathaniel Y. Kerr
Jason M. Davison
Robert E. C. Wildman
Nancy M. DiMarco
Publication date: 01-12-2018
Publisher: BioMed Central
Published in: Journal of the International Society of Sports Nutrition / Issue 1/2018
Electronic ISSN: 1550-2783
DOI: https://doi.org/10.1186/s12970-018-0228-9

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation

Abstract

Background

Methods

Results

Conclusions

Trial registration

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

Trial registration

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