Nighttime Feeding and Morning Endurance Performance

Effect of Nighttime Feeding on Morning Performance in Female Endurance Athletes

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.

Study Overview

• Status: Completed
• Conditions: Poor Performance Status
• Intervention / Treatment: Other: chocolate milk; Other: flavor-matched placebo

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.

• Study Type: Interventional
• Enrollment (Actual): 12
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Florida
    • Tallahassee, Florida, United States, 32306
      • Florida State University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 40 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: Female

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / 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

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Running Performance	10K time trial on a treadmill	24 hours

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Urine Specific Gravity	Changes in urine specific gravity will be measured pre and post a 10K time trial run on a treadmill	24 hours
Urine Volume	Measurement of total urine output.	24 hour

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Exercise Metabolism	Indirect calorimetry will be used to assess macronutrient use during exercise via the respiratory exchange ratio	24 hours

Collaborators and Investigators

• Sponsor: Florida State University
• Investigators: Principal Investigator: Michael J Ormsbee, PhD, Florida State University

Study record dates

Study Major Dates

• Study Start: June 1, 2014
• Primary Completion (Actual): April 1, 2015
• Study Completion (Actual): April 1, 2015

Study Registration Dates

• First Submitted: April 1, 2014
• First Submitted That Met QC Criteria: June 10, 2014
• First Posted (Estimate): June 11, 2014

Study Record Updates

• Last Update Posted (Actual): March 13, 2017
• Last Update Submitted That Met QC Criteria: January 23, 2017
• Last Verified: January 1, 2017

More Information

Terms related to this study

• Other Study ID Numbers: CHMK-1415

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO