Nighttime Feeding and Morning Endurance Performance

Hydration Clinical Trial

Official title:

Effect of Nighttime Feeding on Morning Performance in Female Endurance Athletes

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02160873
• Other study ID #: CHMK-1415
• Status: Completed
• Phase: N/A
• First received: April 1, 2014
• Last updated: May 25, 2015
• Start date: June 2014
• Est. completion date: April 2015

Study information

• Verified date: May 2015
• Source: Florida State University
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Institutional Review Board
• Study type: Interventional

Clinical Trial 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.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 12
• Est. completion date: April 2015
• Est. primary completion date: April 2015
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Female
• Age group: 18 Years to 35 Years

Eligibility

Inclusion Criteria:

• Female

• Between the ages of 18 and 35 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 = 40 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 Design

Allocation: Randomized, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator)

Related Conditions & MeSH terms

• Exercise Metabolism
• Hydration
• Running Performance

Intervention

Other:
• chocolate milk
12 oz, 7-8 hours prior to exercise trial (night before)
• flavor-matched placebo

Locations

Country	Name	City	State
United States	Florida State University	Tallahassee	Florida

Sponsors (2)

Lead Sponsor	Collaborator
Florida State University	Dymatize Nutrition to provide dietary supplements

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	exercise metabolism	Indirect calorimetry will be used to assess macronutrient use during exercise	24 hours	No
Primary	running performance	10K time trial on a treadmill	24 hours	No
Secondary	hydration	Urine specific gravity will be measured and urine volume will be measured pre and post a 10K time trial run on a treadmill	24 hours	No