Introduction: Various studies have evaluated and verified the ergogenic effect of acute caffeine intake on sports performance, specifically on strength and power performance. However, all experimental investigations designed so far have been based on the comparison of the \"caffeine\" and \"placebo\" conditions in a single trial, not considering the reproducibility and variability of caffeine in multiple trials. Objectives: The present study aims to evaluate the reproducibility and replicability of the acute effect of caffeine intake on energy metabolism and the muscular production of force, power and endurance, according to sex (men vs women) and type of exercise ( bench press vs squat).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
48
acute caffeine intake (3 mg/kg)
Acute placebo intake (3 mg/kg of maltodextrin)
Facultad de Medicina y Ciencias de la Salud. Universidad de Alcalá
Alcalá de Henares, Madrid, Spain
Mean velocity at different %1RM
Measuring bar mean velocity desplacement during bench press and back squat exercises.
Time frame: Through study completion, an average of 4 weeks
Peak velocity at different %1RM
Measuring bar peak velocity and time to reach peak velocity of bar desplacement during bench press and back squat exercises.
Time frame: Through study completion, an average of 4 weeks
Mean power output at different %1RM
Measuring during bench press and back squat exercises.
Time frame: Through study completion, an average of 4 weeks
Peak power output and time to reach peak power output at different %1RM
Measuring during bench press and back squat exercises.
Time frame: Through study completion, an average of 4 weeks
Number of repetitions performed in 1 set at 65%1RM until task failure
In bench press and back squat exercises
Time frame: Through study completion, an average of 4 weeks
Bar velocity deplacement performed in 1 set at 65%1RM until task failure
In bench press and back squat exercises
Time frame: Through study completion, an average of 4 weeks
Power output generated in 1 set at 65%1RM until task failure
In bench press and back squat exercise
Time frame: Through study completion, an average of 4 weeks
Resting Metabolic Rate (RMR)
Kcal at rest measuring (RMR) using a metabolic chart.
Time frame: Through study completion, an average of 4 weeks
Maximal Fat Oxidation Rate (MFO)
g/min (MFO) using a metabolic chart.
Time frame: Through study completion, an average of 4 weeks
Physical activity (METs-min/wk)
Using IPAQ
Time frame: Through study completion, an average of 4 weeks
Dietary (g/kg of macronutrients)
Using 24-total recall
Time frame: Through study completion, an average of 4 weeks
Mood state
Mood. Participants graded a set of 29 items related to the mood on a Likert scale from 0 (not at all) to 4 (extremely) in reply to the question;How do you feel at this moment?; to assess six scales: tension, depression, anger, vigor, fatigue and confusion.
Time frame: Through study completion, an average of 4 weeks
Adverse effects
Adverse effects. perception of power, endurance, energy and exertion, as well as heart, muscular and gastrointestinal discomfort.
Time frame: Through study completion, an average of 4 weeks
Fat mass
Using electrical bioimpedance (kg and % of body mass)
Time frame: Through study completion, an average of 4 weeks
Fat-free mass
Using electrical bioimpedance (kg and % of body mass)
Time frame: Through study completion, an average of 4 weeks
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