Acute Caffeine Intake and Velocity Metrics

University of Alcala13 enrolled

Overview

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

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

OTHER

Masking

DOUBLE

Enrollment

Conditions

Caffeine and Resistance Exercise

Interventions

CaffeineDIETARY_SUPPLEMENT

Acute caffeine intake (3 mg·kg-1)

PlaceboDIETARY_SUPPLEMENT

Acute placebo intake (3 mg·kg-1 of maltodextrin)

Eligibility

Sex: MALEMin age: 18 YearsMax age: 35 YearsHealthy volunteers:

Medical Language ↔ Plain English

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.

Locations (1)

Facultad de Medicina y Ciencias de la Salud. Universidad de Alcalá

Alcalá de Henares, Madrid, Spain

Outcomes

Primary Outcomes

Velocity metrics against different relative loads of one-repetition maximum

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.

Time frame: Through study completion, an average of 3 weeks

Secondary Outcomes

Adverse effects

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).

Time frame: Through study completion, an average of 3 weeks

Data from ClinicalTrials.gov

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