Glycemic Index, Nutrition, Physical Capacity, Sport
Conditions
Keywords
Nutrition, Training support, Low Glycemic Index, Moderate Glycemic Index, Endurance, Running
Brief 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.
Detailed 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.
Interventions
OTHERDietary Intervention: Low vs. moderate glycemic index
Sponsors
Poznan University of Life Sciences
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Age
17 Years to 37 Years
Healthy volunteers
Yes
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Changes in fat mass and fat free mass following moderate glycemic index diet | Baseline and after 3 weeks | Fat mass (kg) and fat free mass (kg) analysis |
| Changes in performance in 12-min running test following low glycemic index diet | Baseline and after 3 weeks | — |
| Changes in performance in 12-min running test following moderate glycemic index diet | Baseline and after 3 weeks | — |
| Changes in fat mass and fat free mass following low glycemic index diet | Baseline and after 3 weeks | Fat mass (kg) and fat free mass (kg) analysis |
| Changes in aerobic capacity following low glycemic index diet | Baseline and after 3 weeks | — |
| Changes in aerobic capacity following moderate glycemic index diet | Baseline and after 3 weeks | — |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Statistical evaluation of the significance of differences between the changes in performance in 12-min running test | 1 year | — |
| Statistical evaluation of the significance of differences between the changes in fat mass and fat free mass | 1 year | Fat mass (kg) and fat free mass (kg) |
| Statistical evaluation of the significance of differences between the changes in aerobic capacity indices | 1 year | — |
Countries
Poland
Outcome results
None listed