Effects of Creatine and Carbohydrate Supplementation on Endurance Performance

July 13, 2026 updated by: Todd Hagobian, California Polytechnic State University-San Luis Obispo
This study will examine the independent and combined effects of creatine and carbohydrate supplementation on exercise performance, compared to placebo.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

12

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • California
      • San Luis Obispo, California, United States, 93407
        • California Polytechnic State University
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • healthy (i.e. no known cardiovascular disease), nonsmoking, and active (regular physical activity ≥150 minutes per week of aerobic exercise and have a VO2 peak ≥35 ml/kg-min), a normal BMI (18.5 - 35 kg/m^2), and between ages 18-40 years old.

Exclusion Criteria:

  • previously taken creatine and/or any other dietary supplement that may interfere with exercise performance.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Placebo
Flavored water every 20 minutes
Dietary supplement: placebo solution
Flavored water every 20 minutes
Experimental: Creatine monohydrate
Creatine Monohydrate supplementation every 0.5 grams every 20 minutes
Dietary supplement: Creatine Monohydrate
Creatine monohydrate supplementation 0.5 grams every 20 minutes
Experimental: Carbohydrate
Carbohydrate supplementation 5 grams every 20 minutes
Dietary supplement: Carbohydrate
carbohydrate supplementation 5 grams every 20 minutes
Experimental: Creatine and Carbohydrate
Creatine supplementation at 0.5 gram and carbohydrate supplementation of 5 grams every 20 minutes
Dietary supplement: Creatine Monohydrate and Carbohydrate
Creatine supplementation of 0.5 grams and carbohydrate supplementation of 5 grams every 20 minutes.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Exercise Time to exhaustion
Time Frame: Change in exercise time to exhaustion ( in seconds) through study completion, over the course of study completion, on average 4 weeks.
Time to exhaustion (seconds) during continuous cycling performed at 60% of each participant's maximal cycling power output following supplementation with placebo, creatine monohydrate, or creatine monohydrate plus carbohydrate.
Change in exercise time to exhaustion ( in seconds) through study completion, over the course of study completion, on average 4 weeks.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

California Polytechnic State University-San Luis Obispo

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

July 15, 2026

Primary Completion (Estimated)

August 1, 2026

Study Completion (Estimated)

August 1, 2026

Study Registration Dates

First Submitted

July 8, 2026

First Submitted That Met QC Criteria

July 13, 2026

First Posted (Actual)

July 17, 2026

Study Record Updates

Last Update Posted (Actual)

July 17, 2026

Last Update Submitted That Met QC Criteria

July 13, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2013-CP

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

IPD will be available on the Cal Poly Digital Commons website and available upon request.

IPD Sharing Time Frame

August 1, 2026

IPD Sharing Access Criteria

Available to download

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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