Effect of Ketogenic and Carbohydrate Diet in Crossfit

Nutrition Clinical Trial

Official title:

The Effect of Ketogenic and Carbohydrate, Low-Glycemic Index Diet on Physical and Specific Performance Capacity, and Exercise Metabolism in Crossfit- Trained Athletes

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT03665948
• Other study ID #: ULS00004
• Status: Active, not recruiting
• Phase: N/A
• Start date: January 9, 2017
• Est. completion date: December 20, 2024

Study information

• Verified date: May 2024
• Source: Poznan University of Physical Education
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial 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.

Description:

The impact of various dietary strategies, including the alternative ketogenic diet - recently popular among strength athletes, has not been unequivocally assessed in the high-intensity sport disciplines that Crossfit belongs to. There is also a lack of data in these disciplines about the potential longer adaptation of athletes to the very low carbohydrate intake resulting from the ketogenic diet and its impact in high-intensity Crossfit training. Therefore, the purpose of this study was the assessment of the influence of a 4-week KD and a CHO-LGI 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.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 70
• Est. completion date: December 20, 2024
• Est. primary completion date: November 1, 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 40 Years

Eligibility

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.

Related Conditions & MeSH terms

• Crossfit
• Ketogenic Dieting
• Low Glycemic Index Diet
• Nutrition
• Sport

Intervention

Other:
• Dietary Intervention - Ketogenic Diet (KD)
The experimental procedure for each randomly assigned participant included a 4-week of KD diet.
• Dietary Intervention - Low-Glycemic Index Diet (CHO-LGI)
The experimental procedure for each randomly assigned participant included a 4-week of CHO-LGI diet.

Locations

Country	Name	City	State
Poland	Institute of Human Nutrition and Dietetics, Poznan University of Life Sciences	Poznan

Sponsors (3)

Lead Sponsor	Collaborator
Poznan University of Physical Education	Poznan University of Life Sciences, Poznan University of PhysED

Country where clinical trial is conducted

Poland, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Changes in aerobic capacity following dietary intervention		Baseline and after 4 weeks
Primary	Changes in CrossFit-specific performance capacity (Fight Gone Bad test) following dietary intervention	The number of correctly performed repetitions of exercises (reps)	Baseline and after 4 weeks
Primary	Changes in energy substrates utilization following dietary intervention	Fats (g/min) and carbohydrates (g/min) oxidation analysis	Baseline and after 4 weeks
Secondary	Changes in fat mass and fat free mass following dietary intervention	Fat mass (kg) and fat free mass (kg) analysis	Baseline and after 4 weeks
Secondary	Changes of red and white blood cell concentration in blood following dietary intervention	Red blood cells (RBC) [mln/mm³] and white blood cells (WBC) [mln/mm³] concentration analysis	Baseline and after 4 weeks
Secondary	Changes in blood glucose and hemoglobin concentration following dietary intervention	Hemoglobin (Hb) [g/dl] and glucose [g/dl] concentration analysis	Baseline and after 4 weeks
Secondary	Changes in blood hematocrit levels following dietary intervention	Hematocrit (HCT) [%] level analysis	Baseline and after 4 weeks
Secondary	Changes of testosterone, cortisol, urea, lactate and pyruvate concentration in blood following dietary intervention	Testosterone [mmol/L], cortisol [mmol/L], urea [mmol/L], lactate [mmol/L] and pyruvate [mmol/L] concentration analysis	Baseline and after 4 weeks
Secondary	Changes of creatine kinase, lactate dehydrogenase, alanine aminotransferase and aspartate aminotransferase activity in blood after following dietary intervention	Creatine kinase [U/L], lactate dehydrogenase [U/L], alanine aminotransferase [U/L] and aspartate aminotransferase [U/L] activity analysis	Baseline and after 4 weeks