- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03573687
Effects of Protein Timing and Resistance Exercise on Fat Metabolism
The Effect of Protein Timing and Resistance Exercise on Lipolysis and Fat Oxidation in Resistance-Trained Women
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Nighttime eating, and specifically eating after dinner, has attracted significant attention in recent years, particularly for the onslaught of media claiming the negative implications on body weight and overall health. Some studies have indeed indicated that chronically eating high-energy, mixed-meals rich in carbohydrates (CHO) and fats at night contributes to weight gain and abdominal obesity. However, research to support these negative claims is scant. Conversely, the practice of nighttime eating of small protein (PRO) snacks has been widely utilized anecdotally in populations such as bodybuilders in an attempt to avoid catabolism of muscle mass during the sleeping hours.
It has been shown that nighttime consumption of small portions (<200 kcals) of PRO elicits beneficial effects on metabolism such as increased next-morning resting metabolic rate (RMR). Likewise, the combination of nighttime PRO consumption and RT improves factors that contribute to fat loss such as elevated muscle mass due to an increase in muscle protein synthesis and energy expenditure. Further, there is emerging research suggesting the benefits of nighttime PRO consumption on fat metabolism (specifically the subcutaneous abdominal adipose tissue [SCAAT]). The SCAAT is of particular interest in metabolism research, as the upper body subcutaneous tissue (i.e. SCAAT) supplies most of the circulating free fatty acids (FFA) during the overnight hours in lean individuals. Therefore, if one can optimize the timing of dietary PRO during a window at which SCAAT is elevated (nighttime), theoretically, mobilization and oxidation of fats could be optimized.
Research regarding nighttime eating, specifically regarding fat metabolism, is in its infancy, and thus, many gaps in the literature require elucidation. First, and certainly most importantly, the limited research studies examining the effects of nighttime PRO consumption have not methodologically matched for timing of PRO intake. Therefore, it is unclear whether any reported benefits of the published nighttime PRO studies were a consequence of the addition of PRO calories or specifically due to the consumption of PRO at night. Thus, in order to make optimal comparisons and conclusions, it is imperative to study the metabolic effects of dietary PRO consumed at night versus other times of day.
Therefore, the purpose of this project is to: 1) determine the effects of RT on post-exercise lipolytic rate in resistance-trained women; and 2) determine the effects of timing of acute protein PRO ingestion (nighttime PRO consumption [NP] and daytime PRO consumption [DP] trials) after a RT bout on SCAAT lipolytic rate, metabolic rate, and serum hormones (glucose, insulin, growth hormone, adiponectin, glycerol) throughout the day, overnight and into the next morning.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Florida
-
Tallahassee, Florida, United States, 32306
- Institute for Sports Sciences and Medicine, Florida State University
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Healthy
- Resistance-trained (able to squat 1.0 times their body weight, and bench press 0.75 times body weight, adapted from ACSM Guidelines and piloted in our laboratory)
- Normal weight (BMI = 18.5-25 kg/m2; body fat <33%)
- Normally menstruating (on or off oral contraceptives)
- Females.
Exclusion Criteria:
- Uncontrolled thyroid dysfunction (not on medication)
- Musculoskeletal disorders
- Currently smoke
- Have milk allergies
- Currently take medications or supplements known to affect substrate metabolism.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: RT on Fat Metabolism
Determine the extent to which a full-body acute RT protocol will affect intra-RT and post-RT SCAAT lipolytic rate, and post-RT whole-body substrate utilization in RT women compared to baseline measures (independent of Aims 2 and 3).
|
Resistance exercise training (RT) will target the full body and exercises will be performed using a barbell.
Exercises will be performed in the following order: back squat, bench press, Romanian deadlift, bent-over row, shoulder press, and reverse lunges)
|
Experimental: PRO Timing on Fat Metabolism
Assess the differences in overnight and next morning SCAAT lipolytic rate and next-morning whole-body substrate utilization compared to baseline between acute NP and DP consumption trials after a RT bout in RT women.
|
Resistance exercise training (RT) will target the full body and exercises will be performed using a barbell.
Exercises will be performed in the following order: back squat, bench press, Romanian deadlift, bent-over row, shoulder press, and reverse lunges)
The micellar casein protein supplement (PRO, total protein content: 30 g, 120 kcals; 30 g micellar protein) and non-caloric sensory-matched placebo (PLA, 0kcals) will be specifically formulated by Dymatize® Nutrition FrieslandCampina® and consumed in a randomized order.
Participants will consume the daytime supplement 30 minutes after RT and the nighttime supplement about 30 minutes before bedtime.
The supplements will be premixed, taste-matched (chocolate), and provided in opaque shaker bottles.
|
Experimental: PRO Timing on Markers of Fat Metabolism
Assess the differences in overnight and next morning metabolic biomarkers of fat metabolism compared to baseline between acute nighttime PRO (NP) consumption versus daytime PRO (DP) consumption trials after a RT bout in RT women.
|
Resistance exercise training (RT) will target the full body and exercises will be performed using a barbell.
Exercises will be performed in the following order: back squat, bench press, Romanian deadlift, bent-over row, shoulder press, and reverse lunges)
The micellar casein protein supplement (PRO, total protein content: 30 g, 120 kcals; 30 g micellar protein) and non-caloric sensory-matched placebo (PLA, 0kcals) will be specifically formulated by Dymatize® Nutrition FrieslandCampina® and consumed in a randomized order.
Participants will consume the daytime supplement 30 minutes after RT and the nighttime supplement about 30 minutes before bedtime.
The supplements will be premixed, taste-matched (chocolate), and provided in opaque shaker bottles.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Lipolysis
Time Frame: 18 hours
|
Lipolysis is the way that fat cells mobilize the stored fat to enter into blood circulation.
Lipolysis can be measured using a technique called microdialysis.
In short, a semi-permeable probe is inserted into the subcutaneous abdominal adipose tissue (SCAAT, or belly fat).
Saline combined with a minute amount of ethanol is perfused into the SCAAT, and interstitial fluid is collected out.
The concentration of ethanol in the interstitial fluid sample is an indicator of blood flow within the tissue.
Glycerol and free fatty acid concentration is measured to indicated rate of fat metabolism (specifically glycerol).
The area under the curve for glycerol concentration over time (AUCgly) will be calculated for each of time point.
Microdialysis dialysate samples will be measured during the NP and DP trials at fifteen separate time points throughout each visit.
|
18 hours
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Hormone Concentrations
Time Frame: 18 hours
|
Serum samples will be analyzed for the assessment of glucose, insulin, and growth hormone on collections 1, 3, 4, and 5. Serum glycerol will be assessed at 5 time points. Serum catecholamines will be assessed at time points 1, 2 and 3. The timeline for blood collections is as follows:
|
18 hours
|
Fat oxidation
Time Frame: 18 hours
|
Fat oxidation is when those stored fats enter into the muscle cells and are able to be oxidized to form energy. Fat oxidation will be quantified by measuring resting metabolic rate (RMR, amount of calories burned at rest) and respiratory exchange ratio (RER, measure of whole-body substrate utilization) using a dilution technique and open-circuit indirect calorimetry (ParvoMedics TrueOne 2400 metabolic cart, Sandy, UT).
This technique uses a ventilated hood covering the participants' head and torso.
Participants will be asked to remain awake, quiet, and as motionless as possible in a semi-recumbent position in a quiet, dark, climate-controlled isolated room (20-23°C).
Resting metabolism will be measured on four separate occasions.
|
18 hours
|
Collaborators and Investigators
Sponsor
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- NPRO
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
Clinical Trials on Healthy
-
Prevent Age Resort "Pervaya Liniya"RecruitingHealthy Aging | Healthy Diet | Healthy LifestyleRussian Federation
-
Maastricht University Medical CenterCompletedHealthy Volunteers | Healthy Subjects | Healthy AdultsNetherlands
-
Yale UniversityNot yet recruitingHealth-related Benefits of Introducing Table Olives Into the Diet of Young Adults: Olives For HealthHealthy Diet | Healthy Lifestyle | Healthy Nutrition | CholesterolUnited States
-
Hasselt UniversityRecruitingHealthy | Healthy AgingBelgium
-
Galera Therapeutics, Inc.Syneos HealthCompleted
-
Galera Therapeutics, Inc.Syneos HealthCompletedHealthy | Healthy VolunteersAustralia
-
University of PennsylvaniaActive, not recruitingHealthy | Healthy AgingUnited States
-
Chalmers University of TechnologyGöteborg UniversityCompletedHealthy | Nutrition, HealthySweden
-
University of ManitobaNot yet recruitingHealthy | Healthy Diet
Clinical Trials on Resistance Exercise Training
-
Bangor UniversityBetsi Cadwaladr University Health BoardCompletedChronic Kidney DiseaseUnited Kingdom
-
Florida State UniversityNutrisystem, Inc.CompletedHypertension | Obesity | Pre-hypertensionUnited States
-
Beijing Sport UniversityRecruitingHypertension | Cognitive FunctionChina
-
University of HoustonTerminated
-
Iowa State UniversityNational Institute of Mental Health (NIMH)Recruiting
-
University of Alberta, Physical EducationCanadian Breast Cancer Research AllianceCompleted
-
University of JyvaskylaRecruiting
-
Rigshospitalet, DenmarkCompleted
-
University of Kansas Medical CenterNational Strength and Conditioning Association FoundationRecruiting
-
Texas A&M UniversityRecruiting