Nighttime Macronutrient Choice and Combined Resistance and High-intensity Interval Training

Not Applicable

Completed

• Conditions: Obesity
• Interventions: Other: Whey Protein; Other: Combined Resistance and High-Intensity Interval training; Other: Casein Protein

• Registration Number: NCT01830946
• Lead Sponsor: Florida State University

Brief Summary

Obesity is recognized as a major public health concern because of its link to potential fatal complications arising from metabolic and cardiovascular diseases. Despite many pharmacological advances in this field, lifestyle strategies that emphasize proper nutrient intake and physical activity continue to be the primary strategy for individuals to fight obesity. However, controversy exists regarding the type and timing of exercise and specific nutrient intake to maximize fat loss, muscle gain, and beneficial cardio-metabolic adaptations derived from these lifestyle interventions. Furthermore, limited data exists investigating the impact of nutrient timing at times other than immediately before or after exercise and no studies have examined time-of-day nutritional intake in overweight or obese individuals.In addition, many individuals attempting to improve body composition and cardio-metabolic health are concerned with what food choices are appropriate in the late evening to support positive physiological adaptations. However, research-based information examining this topic is scarce.

The investigators hypothesize that consumption of a protein beverage in the late evening before sleep will improve body composition, cardio-metabolic health, and adaptations to exercise more than an isocaloric placebo beverage. The investigators also hypothesize that the different digestion and absorption kinetics of whey and casein proteins will elicit different effects on the measures variables.

Detailed Description

The purpose of this study is to examine the effect of consumption of a protein beverage in the late evening before sleep along with the combination of resistance and high-intensity interval training on improving body composition, muscle strength and overall health compared to a carbohydrate placebo beverage in overweight and obese individuals. Specifically, we will be measuring heart rate, blood pressure, body composition, resting metabolism, maximal strength,cardiovascular function, hormones levels, blood lipid profile, appetite, mood state, and dietary intake. Specific aims of the study are:

To determine if acute ingestion of a liquid ready-to-drink protein supplement (30g whey or casein protein per serving) consumed in the late evening before sleep will alter the physiological milieu to favor anabolism and alter lipolysis and fat oxidation more than the carbohydrate placebo (34g of maltodextrin per serving).

To determine if 4 weeks of daily protein supplementation (same supplement as above) in the late evening along with 3 days of exercise training per week will improve body composition, blood lipid profile, strength, cardiovascular risk profile more than a placebo beverage.

Study Timeline

• Study Start: 2011-09
• Primary Completion: 2012-08
• Study Completion: 2012-11
• Status Verified: 2013-04
• Study First Submitted: 2013-04-10
• Study First Submitted QC: 2013-04-10
• Last Update Submitted: 2013-04-11
• Study First Posted: 2013-04-12
• Last Update Posted: 2013-04-15

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 59

Inclusion Criteria

• Healthy men and women
• Sedentary(exercises <2 days per week for more than 40 minutes per session within the past 6 months)
• overweight or obese (BMI ≥ 25)

Exclusion Criteria

• Those that exercise for more than 2 days per week for more than 40 minutes per session (within the past 6 months),
• Those that have uncontrolled hypertension (Blood Pressure (BP)>160/100 mmHg)
• Those that take BP medications
• Those diagnosed cardiovascular disease
• Those diagnosed with stroke
• Those diagnosed with diabetes
• Those diagnosed with thyroid dysfunction
• Those diagnosed with kidney dysfunction
• Those with any musculoskeletal complications that would impede exercise
• Those that smoke heavily (>20 cigarettes per day)
• Those that take cholesterol medication
• Those that take nutritional supplements (except for a multivitamin)
• Those with any allergies to milk products

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Whey Protein and Exercise Training	Combined Resistance and High-Intensity Interval training	This arm involves 4 weeks of consuming a whey protein supplement late in the evening before bed along with combined resistance and high-intensity interval training 3 days per week for 4 weeks (two days of resistance training and one day of high-intensity interval training).
Whey Protein and Exercise Training	Whey Protein	This arm involves 4 weeks of consuming a whey protein supplement late in the evening before bed along with combined resistance and high-intensity interval training 3 days per week for 4 weeks (two days of resistance training and one day of high-intensity interval training).
Carbohydrate and Exercise Training	Combined Resistance and High-Intensity Interval training	This arm involves 4 weeks of consuming a carbohydrate placebo late in the evening before bed along with combined resistance and high-intensity interval training 3 days per week for 4 weeks (two days of resistance training and one day of high-intensity interval training).
Casein Protein and Exercise Training	Combined Resistance and High-Intensity Interval training	This arm involves 4 weeks of consuming a casein protein supplement late in the evening before bed along with combined resistance and high-intensity interval training 3 days per week for 4 weeks (two days of resistance training and one day of high-intensity interval training).
Casein Protein and Exercise Training	Casein Protein	This arm involves 4 weeks of consuming a casein protein supplement late in the evening before bed along with combined resistance and high-intensity interval training 3 days per week for 4 weeks (two days of resistance training and one day of high-intensity interval training).

Primary Outcome Measures

Name	Time	Method
Metabolism	4 weeks	Measured using indirect calorimetry, a non-invasive test that involves lying down on a padded table for 30-minutes with a mouth piece and nose clip
Body Composition	4 weeks	Measuring fat mass and lean mass from dual-energy x-ray absorptiometry.

Secondary Outcome Measures

Name	Time	Method
Arterial Stiffness	4 weeks	Measured using pulse wave velocity of the aorta, systemic, and legs
Blood biomarkers	4 weeks	Under sterile conditions 20 milliliters of blood was drawn from a forearm antecubital vein and analyzed for blood biomarkers.
Appetite	4 weeks	Measured by a visual analog scale
Strength	4 weeks	Assessed by having the subject progressed towards the maximum weight that they can lift 1-time through a full range of motion and all attempts and will be supervised by trained personnel

Trial Locations

Locations (1)

Florida State University; 🇺🇸 Tallahassee, Florida, United States