Caffeine and Resistance Exercise
Conditions
Brief summary
The purpose of this study was to determine whether the acute ergogenic effects of caffeine differ according to the velocity metric used to assess strength performance against different relative loads. Thirteen resistance-trained men completed a triple-blind, randomized, placebo-controlled, crossover study. Participants ingested either caffeine (3 mg·kg-1) or a placebo 60 min before performing bench press and back squat exercises at 25%, 50%, 75%, and 90% of one-repetition maximum (1RM). Mean velocity (MV) and mean propulsive velocity (MPV) were simultaneously recorded using a linear position transducer
Interventions
DIETARY_SUPPLEMENTCaffeine
Acute caffeine intake (3 mg·kg-1)
DIETARY_SUPPLEMENTPlacebo
Acute placebo intake (3 mg·kg-1 of maltodextrin)
Sponsors
University of Alcala
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
DOUBLE (Subject, Investigator)
Masking description
Statistician
Eligibility
Sex/Gender
MALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* Age between 18 and 35 years. * Body Mass Index (BMI) \< 25 kg/m². * Resistance-trained individuals (more than 6 months of structured training). * Healthy men and women without neurological, cardiometabolic, immunological, or physical conditions that prevent them from exercising. * Participants must be able to perform the tests described in the following section.
Exclusion criteria
* History of neuromuscular diseases, heart disease, or conditions that may affect liver or muscle metabolism. * Use of drugs, stimulants, or sports supplements that could interfere with the dietary supplement used in the study. * Sedentary habits (less than 150 minutes/week of moderate exercise). * Having undergone prolonged periods of physical inactivity in the 6 months prior to the study. * Engaging in strenuous exercise within 48 hours prior to the tests.• Failure to replicate the same food intake on both experimental days. * Consumption of caffeine or any other stimulant after 6 pm on the day before the tests, to avoid headaches, discomfort, or lethargy in regular caffeine consumers.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Velocity metrics against different relative loads of one-repetition maximum | Through study completion, an average of 3 weeks | Measuring bar mean velocity (during propulsive and braking phases in m/s) and mean propulsive velocity (m/s of the propulsive phase) displacement of the concentric phase during bench press and back squat exercises at 25%, 50%, 75%, and 90%1RM. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Adverse effects | Through study completion, an average of 3 weeks | perception of power, endurance, energy and exertion, as well as heart, muscular and gastrointestinal discomfort were measured using a 5-point scale, with scores ranging from 1 (lowest perception or absence of symptoms) to 5 (highest perception or severity). |
Countries
Spain
Outcome results
None listed