APEX Study

Study Type

Physical Activity

Study Purpose

The purpose of this research study is to test the effectiveness of a carbohydrate-electrolyte beverage in reducing the risk of dehydration and improving performance during exercise.

About the Study

How does dehydration affect exercise performance?

This study is designed to test the effectiveness of a carbohydrate-electrolyte beverage compared with water or placebo in helping fluid balance during 120 minutes of continual exercise in a heated environment, and improving exercise performance in a time trial.

Study Design

Number of visits:

  • 1 Screening visit
  • 1 Baseline visit
  • 4 Clinic visitsĀ 

Study procedures:

  • VO2 Max Test and ECG
  • Height, weight, BMI, vitals
  • Blood draw
  • Urine collection

Eligible participants will be randomly assigned to one of three intervention groups:

  • Carbohydrate-electrolyte beverage group
  • Water group
  • Placebo group

At the four clinic visits, participants will complete a 120 minute steady-state bout of exercise, including a 30 minute timed performance test on a stationary bike. Three of the four visits will be conducted in a heated environment.

All study related health exams, exercise and metabolism testing, and results will be provided at no cost to the participant.

Study Qualifications

  • Male
  • Age: 18-35 years old
  • Healthy and active
  • Currently cycling 2.5 hours or more, continuously, at least 1 day/week

Study Duration

6-7 weeks


Earn up to $550 for participation

Study Contact

If you are interested in volunteering for the APEX Study, you can screen online at www.pbrc.edu/apex , call 225-763-3000, or email clinicaltrials@pbrc.edu

If you think you may be eligible, please click the button below to screen online.


Please do not fill out this questionnaire for anyone other than yourself unless you are their legal guardian.
If you know someone who may be interested please direct them to the site or have them call us directly at 225-763-3000.


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