Introduction: Several studies have evaluated and confirmed the ergogenic effect of acute caffeine intake on sports performance, specifically on strength and power performance. However, little is known about the prolonged effect of this supplement on neuromuscular adaptations to strength training. Introduction: Several studies have evaluated and confirmed the ergogenic effect of acute caffeine intake on sports performance, specifically on strength and power performance. However, little is known about the prolonged effects of this supplement on neuromuscular adaptations to strength training. Objectives: The present study aims to analyze the effects of acute and chronic caffeine intake on neuromuscular adaptations to strength training, according to sex (men vs. women) and type of exercise (bench press vs. squat), as well as on fatigue resistance during repeated sprints, fatigue perception, mood state, reaction time, diet, and potential side effects.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
48
Acute caffeine intake (3 mg/kg) prior each resistance training session of a 8 weeks training program.
Acute placebo intake (3 mg/kg of maltodextrin) prior each resistance training session of a 8 weeks training program.
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 12 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 12 weeks
Mean power output at different %1RM
Measuring during bench press and back squat exercises.
Time frame: Through study completion, an average of 12 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 12 weeks
Number of repetitions performed at 65%1RM until task failure
In bench press and back squat exercises
Time frame: Through study completion, an average of 12 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 12 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 12 weeks
Resting Metabolic Rate (RMR)
Kcal at rest using a metabolic chart.
Time frame: Through study completion, an average of 12 weeks
Maximal Fat Oxidation Rate (MFO)
g/min using a metabolic chart.
Time frame: Through study completion, an average of 12 weeks
Fat mass
Using electrical bioimpedance (kg and % of body mass)
Time frame: Through study completion, an average of 12 weeks
Fat-free mass
Using electrical bioimpedance (kg and % of body mass)
Time frame: Through study completion, an average of 12 weeks
Physical activity (METs-min/wk)
Using IPAQ
Time frame: Through study completion, an average of 12 weeks
Dietary (g/kg of macronutrients)
Using a 24-total recall
Time frame: Through study completion, an average of 12 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 12 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 12 weeks
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