UnknownNot Applicable

Effect of Ketogenic and Carbohydrate Diet in Crossfit

Poland70 participantsStarted 2017-01-09

Plain-language summary

The purpose of the presented study was to assess the influence of Ketogenic (KD) and a carbohydrate diet with a low glycemic index (CHO-LGI) of a 4-week diet on physical and specific performance capacity, exercise metabolism, as well as concentrations of the selected biochemical blood markers in Crossfit- trained athletes, in a randomised and parallel trial.

Who can participate

Age range

18 Years – 40 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * written consent to participate, * a current medical clearance to practice sports, * training experience: at least 2 years, * minimum of 4 workout sessions (Crossfit) a week. Exclusion Criteria: * current injury, * any health-related contraindication, * declared general feeling of being unwell, * unwilling to follow the study protocol, * smoking, illicit drug use, alcohol consumption greater than 1-2 drinks/week, dietary supplements use less than 3 weeks before the study, * females- being pregnant or planning to become pregnant during the study.

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Changes in aerobic capacity following dietary intervention

Timeframe: Baseline and after 4 weeks

Changes in CrossFit-specific performance capacity (Fight Gone Bad test) following dietary intervention

Timeframe: Baseline and after 4 weeks

Changes in energy substrates utilization following dietary intervention

Timeframe: Baseline and after 4 weeks

Trial details

NCT IDNCT03665948

SponsorPoznan University of Physical Education

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2024-11-01

View on ClinicalTrials.gov More Nutrition trials

Plain-language summary

Who can participate

Age range

18 Years – 40 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

What they're measuring

Changes in aerobic capacity following dietary intervention

Timeframe: Baseline and after 4 weeks

Changes in CrossFit-specific performance capacity (Fight Gone Bad test) following dietary intervention

Timeframe: Baseline and after 4 weeks

Changes in energy substrates utilization following dietary intervention

Timeframe: Baseline and after 4 weeks