Nighttime Feeding and Morning Endurance Performance

NCT ID: NCT02160873

Last Updated: 2017-03-13

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 12 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2014-06-30
• Study Completion Date: 2015-04-30

Brief Summary

The purpose of this study is to investigate the influence of a nighttime feeding on next morning running performance, hydration status, and exercise metabolism in female endurance athletes. Specifically, the effect of a chocolate milk beverage will be examined versus a non-nutritive, flavor-matched placebo. The investigators hypothesize that the nighttime consumption of chocolate milk, a whole food complex, will result in improved next morning running performance versus placebo. Secondarily, the investigators hypothesize that any potential positive performance outcomes from the chocolate milk treatment may be due to an enhanced pre-exercise hydration status or improved exercise metabolism.

Detailed Description

This study will be interventional in nature and employ a crossover, randomized, double-blinded approach. This study will include a maximal oxygen uptake test and three trials: one familiarization trial, and two experimental trials. The familiarization will serve as a practice test to minimize any training effects between experimental trials. The experimental trials will be completed within a 2-week period determined by the luteal phase of the menstrual cycle (days 15-28 of the menstrual cycle, with day 1 being the first day of menstruation). A minimum of 48-72 hours will be provided between testing days.

Experimental trials will consist of baseline testing (height, weight, urinalysis, resting metabolic rate), followed by a treadmill performance protocol. Participants will complete a 3-stage incremental exercise test (at 55%, 65%, and 75% of maximal oxygen uptake respectively). Metabolic data will be collected during this time. Participants will then complete a 10-kilometer running time trial in which markers of intensity are monitored at various time points (blood glucose, blood lactate, heart rate, rating of perceived exertion). Participants and primary researchers will be blinded to all time and speed data. Distance will be the only known measure of progress. Additional blood, urine, and body weight measures will be taken immediately post exercise.

Conditions

Poor Performance Status

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: OTHER
• Blinding Strategy: DOUBLE

Study Groups

chocolate milk

In this arm, subjects receive chocolate milk

Group Type: EXPERIMENTAL

chocolate milk

Intervention Type: OTHER

12 oz, 7-8 hours prior to exercise trial (night before)

flavor-matched placebo

In this arm, subjects receive a flavor-matched placebo

Group Type: PLACEBO_COMPARATOR

flavor-matched placebo

Intervention Type: OTHER

12 oz, non-caloric flavor-matched placebo

Interventions

chocolate milk

12 oz, 7-8 hours prior to exercise trial (night before)

Intervention Type: OTHER

flavor-matched placebo

12 oz, non-caloric flavor-matched placebo

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Female
• Between the ages of 18 and 40 years old
• Consistently use oral contraceptives (greater than 2 months) or be considered eumenorrheic without oral contraceptive use
• 'Moderately trained,' defined as a weekly mileage ≥ 25 miles for at least 6 months, and a VO2max ≥ 45 ml/kg/min

Exclusion Criteria

• Lactose intolerant
• Smokers
• Uncontrolled thyroid conditions
• Uses anti-inflammatory drugs or any dietary supplements intended to improve performance
• Have musculoskeletal injury that could limit performance

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 40 Years
• Eligible Sex: FEMALE
• Accepts Healthy Volunteers: Yes

Sponsors

Florida State University

OTHER

Sponsor Role: lead

Responsible Party

Michael J. Ormsbee

Assistant Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Michael J Ormsbee, PhD

Role: PRINCIPAL_INVESTIGATOR

Florida State University

Locations

Florida State University

Tallahassee, Florida, United States

Countries

United States

Other Identifiers

CHMK-1415

Identifier Type: -

Identifier Source: org_study_id