Effect of Glycemic Index on Physical Capacity in Runners

Nutrition Clinical Trial

Official title:

Effects of Low and Versus Moderate Glycemic Index Diets on Physical Capacity and Body Composition in Endurance- Trained Runners

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03062527
• Other study ID #: ULS00001
• Status: Completed
• Phase: N/A
• First received: February 14, 2017
• Last updated: February 20, 2017
• Start date: January 2015
• Est. completion date: May 1, 2015

Study information

• Verified date: February 2017
• Source: Poznan University of Life Sciences
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The purpose of the present study was to assess the influence of low vs moderate glycemic index of a 3-week diet on aerobic capacity, endurance performance and body mass and composition in endurance-trained athletes in a randomized, controlled crossover trial.

Description:

The effect of glycemic index of pre-exercise meal on endurance capacity and performance has been widely investigated. However, little is known about the adaptations to longer dietary interventions with different glycemic index and their influence on aerobic capacity and body composition in runners. Therefore, the purpose of this study was the assessment of the influence of low GI vs moderate GI of a 3-week diet on aerobic capacity, endurance performance and body mass and composition in endurance-trained athletes in a randomised, controlled crossover trial.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 36
• Est. completion date: May 1, 2015
• Est. primary completion date: February 6, 2015
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 17 Years to 37 Years

Eligibility

Inclusion Criteria:

• written consent to participate,

• male and female,

• a current medical clearance to practice sports,

• training experience: at least 3 years,

• minimum of 4 workout sessions a week lasting at least 1.5-2 hours/day,

• age: 17 - 37 years.

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

• Glycemic Index
• Nutrition
• Physical Capacity
• Sport

Intervention

Other:
• Dietary Intervention: Low vs. moderate glycemic index

Locations

Country	Name	City	State
Poland	Poznan University of Life Sciences, ul.Wojska Polskiego 31	Poznan	Wielkopolska

Sponsors (1)

Lead Sponsor	Collaborator
Poznan University of Life Sciences

Country where clinical trial is conducted

Poland, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Changes in aerobic capacity following low glycemic index diet		Baseline and after 3 weeks
Primary	Changes in aerobic capacity following moderate glycemic index diet		Baseline and after 3 weeks
Primary	Changes in performance in 12-min running test following low glycemic index diet		Baseline and after 3 weeks
Primary	Changes in performance in 12-min running test following moderate glycemic index diet		Baseline and after 3 weeks
Primary	Changes in fat mass and fat free mass following low glycemic index diet	Fat mass (kg) and fat free mass (kg) analysis	Baseline and after 3 weeks
Primary	Changes in fat mass and fat free mass following moderate glycemic index diet	Fat mass (kg) and fat free mass (kg) analysis	Baseline and after 3 weeks
Secondary	Statistical evaluation of the significance of differences between the changes in aerobic capacity indices		1 year
Secondary	Statistical evaluation of the significance of differences between the changes in performance in 12-min running test		1 year
Secondary	Statistical evaluation of the significance of differences between the changes in fat mass and fat free mass	Fat mass (kg) and fat free mass (kg)	1 year