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

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.

Conditions

• Obesity

Interventions

OTHER

Whey Protein

Whey protein will be consumed every night of the week as the last food or caloric beverage prior to sleep in the evening at least two hours after dinner but no more than 30 minutes before bed.

OTHER

Combined Resistance and High-Intensity Interval training

Completed 3 d/wk for 4 wks (2 d of Resistance Training (RT) and 1 d of High-Intensity Interval Training (HITT)). RT exercises were chest press, seated row,leg press, shoulder press, leg extension, and leg curl (3 total sets: 2 sets of 10 repetitions and a 3rd set to muscular exhaustion with a load equaling 75-85% of 1-Repetition Maximum(RM)). All exercises and sets were separated by 90-120 sec of rest. HIIT training was completed on commerical cardiovascular equipment and requires subjects to rate their perceived exertion on a scale from 1 to 10 (1= resting quietly, 5= a warm-up level, 10= an all-out exertion). Subjects warmed-up for 2 min at level 5 and increased their exertion each min for 3 min until level 9 is perceived and then recover at level 6 for 1 min. This pattern was repeated 4 times, where the 4th cycle subjects increased their last min of exertion to level 10, followed by 1-min recovery at the initial warm-up level 5.

OTHER

Casein Protein

Casein protein will be consumed every night of the week as the last food or caloric beverage prior to sleep in the evening at least two hours after dinner but no more than 30 minutes before bed.

Sponsors & Collaborators

• Florida State University

  lead OTHER

Principal Investigators

• Michael J Ormsbee, Ph.D. · Florida State University

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

45 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2011-09-30

Primary Completion

2012-08-31

Completion

2012-11-30

Countries

• United States

Study Locations