Effects of Casein Timing on Body Composition and Performance

NCT ID: NCT03352583

Last Updated: 2017-11-24

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 33 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2016-09-01
• Study Completion Date: 2016-11-18

Brief Summary

This study will investigate the effects of night time versus day time casein supplementation on body composition and athletic performance. Participants will consume the protein supplements daily while participating in a supervised, periodized resistance training program.

Detailed Description

In a randomized, double-blind, placebo-, exercise- and diet-controlled design, 60 subjects will participate in a 10-week study to determine the influence of selective protein timing on body composition, metabolic, and performance adaptations to resistance training. Diets will be individually standardized using the Cunningham equation adjusted for activity level to determine total maintenance calories. Carbohydrates, fats, and proteins will represent 50, 25, and 25 percent of the determined total calories. Diet counseling will occur weekly until stabilized and biweekly thereafter to ensure compliance with food and fluid intake. Protein will be distributed throughout the day as >0.30g/kg bw/meal for breakfast, lunch, and dinner. Resistance training sessions will be supervised by research staff and occur 4 times per week and begin between 7 am and 5pm. Exercises will consist of single- and multi-joint exercises for all major muscle groups (legs, chest, back, shoulders, core, and arms), be performed for 3-5 sets of 1-20 repetitions with 1-5 minutes rest between sets, and each muscle group will undergo 72-96 hours rest between training sessions within the periodized program. Protein supplements. In the treatment group, the casein supplement (40g calcium caseinate dissolved in water) will be consumed as the last meal (>2h following previous meal) before bed and the placebo (40g maltodextrin dissolved in water) either before resistance training, if training after 10am, or after resistance training, if before 10am. The control group will alternate consumption times of the casein supplement and placebo. The supplement (treatment group) or placebo (control group) will not be consumed within 3 hours of beginning or ending resistance training, nor will it be consumed within 3 hours of the first meal following waking. All groups will be provided with 0.30g/kg bw whey protein isolate immediately following training to facilitate recovery. Supplements will be consumed at a similar time of day on non-training days.

Conditions

Body Composition

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: DOUBLE

Study Groups

Day

Group receives casein protein during the day (greater than 6 hours before bed).

Group Type: ACTIVE_COMPARATOR

Protein

Intervention Type: DIETARY_SUPPLEMENT

40g calcium caseinate

Night

Group receives casein protein immediately before going to bed.

Group Type: EXPERIMENTAL

Protein

Intervention Type: DIETARY_SUPPLEMENT

40g calcium caseinate

Interventions

Protein

40g calcium caseinate

Intervention Type: DIETARY_SUPPLEMENT

Eligibility Criteria

Inclusion Criteria

• healthy
• trained (exercises 2-5 days per week for previous 1-3 years)
• maintains regular sleep patterns (7-9 hours per night weekly average)

Exclusion Criteria

• use of ergogenic aids or medicines known to influence outcomes
• data will be excluded if a participant is <80% compliant with diet and training interventions
• consumes greater than or equal to 12 alcoholic beverages per week
• tobacco use
• dairy allergy

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 30 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: Yes

Sponsors

Texas Woman's University

OTHER

Sponsor Role: lead

Responsible Party

Jordan Joy

Graduate Research Assistant

Responsibility Role: PRINCIPAL_INVESTIGATOR

Locations

Texas Woman's University

Denton, Texas, United States

Countries

United States

References

Joy JM, Vogel RM, Shane Broughton K, Kudla U, Kerr NY, Davison JM, Wildman REC, DiMarco NM. Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation. J Int Soc Sports Nutr. 2018 May 15;15(1):24. doi: 10.1186/s12970-018-0228-9.

Reference Type: DERIVED

PMID: 29764464 (View on PubMed)

Other Identifiers

18896

Identifier Type: -

Identifier Source: org_study_id