Dietary Supplements
Conditions
Interventions
This was a randomized, controlled, crossover, double-blind clinical study with two arms. Twelve professional male beach volleyball players participated in a 2-arm crossover design in a randomized orde
Sponsors
Centro de Ciências da Saúde e do Esporte
Centro de Ciências da Saúde e do Esporte
Eligibility
Sex/Gender
Male
Age
18 Years to No maximum
Inclusion criteria
Inclusion criteria: Be at least 18 years of age; to be of the masculine gender; regularly training and competing at a professional level in beach volleyball for at least 2 years; being free from chronic diseases; self-report of not regularly using any substance that could interfere with metabolic responses; self-report of not regularly using any nutritional supplement containing intracellular buffers
Exclusion criteria
Exclusion criteria: Possess a physical limitation that makes them unable to jump or attack; engage in physical activity within 24 hours preceding the tests
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| We expect to find greater distances covered in five speed zones, measured by a global positioning system device throughout the three sets of beach volleyball games with caffeine supplementation, compared to games with placebo supplementation;We expect to observe a smaller performance decrement in maximum and average height during countermovement jumps, measured through a video application, both before and after beach volleyball games with caffeine supplementation, compared to games with placebo supplementation;We expect to find a greater increase in earlobe blood lactate concentration, analyzed by an enzymatic-amperometric analyzer, when measured before and after beach volleyball games played with caffeine supplementation, compared to games played with placebo supplementation;We expect to find a greater serve speed, measured by radar before and after beach volleyball games, when players are under caffeine supplementation compared to placebo;We expect to observe a higher maximum and average heart rate, monitored by a chest strap heart rate monitor, throughout the three sets of beach volleyball games under caffeine supplementation compared to games under placebo supplementation;We expect to find a longer time maintained in five heart rate zones, as monitored by a chest strap heart rate monitor, throughout the three sets of beach volleyball games with caffeine supplementation, compared to games with placebo supplementation;We expect to find a lower subjective perception of effort, as measured by a Borg scale 0 to 10 points, throughout the three sets of beach volleyball games with caffeine supplementation, compared to games with placebo supplementation;We expect to find a higher blood lactate concentration, obtained from the earlobe and analyzed by an enzymatic-amperometric analyzer, throughout the three sets of beach volleyball games with caffeine supplementation, compared to games with placebo supplementation;We expect to find greater acceleration, deceleration, avera | — |
Secondary
| Measure | Time frame |
|---|---|
| No secondary outcomes are expected | — |
Countries
Brazil
Contacts
Public ContactFernando Borszcz
Universidade do Estado de Santa Catarina
Outcome results
None listed