Muscle strength
Conditions
Interventions
This was a randomized, double-blind, within-participant, balanced placebo, crossover clinical trial. Sixteen resistance-trained men aged 18 to 30 years completed six morning visits: visit 1 (familiari
each sequence was numbered with a random number generator and assigned sequentially based on enrollment order, and an independent investigator
Sponsors
Universidade de Brasilia
Universidade de Brasilia
Eligibility
Sex/Gender
Male
Age
18 Years to 30 Years
Inclusion criteria
Inclusion criteria: Young men (18 to 30 years old); At least six months of experience in strength training; Be healthy, especially considering cardiovascular and metabolic aspects; Not have any type of injury or joint, muscle, or bone problem that affects the knee extension exercise; Not report increased sensitivity or allergy to caffeine; Not be using anabolic steroids; Not be using supplements containing caffeine for at least one week; Be familiar with the squat exercise; Not be a smoker
Exclusion criteria
Exclusion criteria: Failure to complete all scheduled sessions; Performing resistance exercises, cyclic exercises, or any other type of exercise for the lower limbs during the experimental period that may affect the participant's performance during the tests; Using ergogenic substances other than those prescribed during the study period; Consuming additional caffeine not planned during the experimental period that may affect the test results
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Expected outcome 1: We hypothesized that caffeine supplementation would produce a small increase in muscle strength (Cohen's d = 0.2). Expected outcome 2: We hypothesized that caffeine supplementation would produce a small increase in muscle endurance (Cohen's d = 0.3).;Observed outcome 1: We found that caffeine supplementation produced a small increase in muscle strength (Cohen's d = 0.2). Observed outcome 2: We found that caffeine supplementation did not result in increased muscle endurance (Cohen's d = 0.0). | — |
Countries
Brazil
Contacts
Public ContactEdgard Melo Keene Von Koenig Soares
Universidade de Brasilia
Outcome results
None listed