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Nighttime Feeding and Morning Endurance Performance

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02160873
Recruitment Status : Completed
First Posted : June 11, 2014
Results First Posted : March 13, 2017
Last Update Posted : March 13, 2017
Information provided by (Responsible Party):
Michael J. Ormsbee, Florida State University

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.

Condition or disease Intervention/treatment Phase
Poor Performance Status Other: chocolate milk Other: flavor-matched placebo Not Applicable

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.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 12 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Other
Official Title: Effect of Nighttime Feeding on Morning Performance in Female Endurance Athletes
Study Start Date : June 2014
Actual Primary Completion Date : April 2015
Actual Study Completion Date : April 2015

Arm Intervention/treatment
Experimental: chocolate milk
In this arm, subjects receive chocolate milk
Other: chocolate milk
12 oz, 7-8 hours prior to exercise trial (night before)

Placebo Comparator: flavor-matched placebo
In this arm, subjects receive a flavor-matched placebo
Other: flavor-matched placebo
12 oz, non-caloric flavor-matched placebo

Primary Outcome Measures :
  1. Running Performance [ Time Frame: 24 hours ]
    10K time trial on a treadmill

Secondary Outcome Measures :
  1. Urine Specific Gravity [ Time Frame: 24 hours ]
    Changes in urine specific gravity will be measured pre and post a 10K time trial run on a treadmill

  2. Urine Volume [ Time Frame: 24 hour ]
    Measurement of total urine output.

Other Outcome Measures:
  1. Exercise Metabolism [ Time Frame: 24 hours ]
    Indirect calorimetry will be used to assess macronutrient use during exercise via the respiratory exchange ratio

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 40 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02160873

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United States, Florida
Florida State University
Tallahassee, Florida, United States, 32306
Sponsors and Collaborators
Florida State University
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Principal Investigator: Michael J Ormsbee, PhD Florida State University
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Responsible Party: Michael J. Ormsbee, Assistant Professor, Florida State University Identifier: NCT02160873    
Other Study ID Numbers: CHMK-1415
First Posted: June 11, 2014    Key Record Dates
Results First Posted: March 13, 2017
Last Update Posted: March 13, 2017
Last Verified: January 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No