Caffeine and Resistance Exercise
Conditions
Brief summary
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).
Interventions
DIETARY_SUPPLEMENTCaffeine
acute caffeine intake (3 mg/kg)
DIETARY_SUPPLEMENTPlacebo
Acute placebo intake (3 mg/kg 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
ALL
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 (> 2 years of structured trained). * 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 diseases, or diseases that may affect liver or muscle metabolism. * Use of drugs, other stimulants or sport supplements that interfere with the the study dietary supplement. * Sedentary habits (<150 min/week of moderate exercise). * Having undergone prolonged periods of forced physical inactivity during the 6 months prior to the study. * Performing strenuous exercise during the 48 hours prior to the tests. * Failure to replicate the same food intake on the two days of the experiments. * Consuming caffeine or any other stimulant after 6 pm the day before the training or tests, to avoid headaches, discomfort, or lethargy among regular caffeine consumers.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Maximal Fat Oxidation Rate (MFO) | Through study completion, an average of 4 weeks | g/min (MFO) using a metabolic chart. |
| Mean power output at different %1RM | Through study completion, an average of 4 weeks | Measuring during bench press and back squat exercises. |
| Peak power output and time to reach peak power output at different %1RM | Through study completion, an average of 4 weeks | Measuring during bench press and back squat exercises. |
| Number of repetitions performed in 1 set at 65%1RM until task failure | Through study completion, an average of 4 weeks | In bench press and back squat exercises |
| Bar velocity deplacement performed in 1 set at 65%1RM until task failure | Through study completion, an average of 4 weeks | In bench press and back squat exercises |
| Power output generated in 1 set at 65%1RM until task failure | Through study completion, an average of 4 weeks | In bench press and back squat exercise |
| Resting Metabolic Rate (RMR) | Through study completion, an average of 4 weeks | Kcal at rest measuring (RMR) using a metabolic chart. |
| Mean velocity at different %1RM | Through study completion, an average of 4 weeks | Measuring bar mean velocity desplacement during bench press and back squat exercises. |
| Peak velocity at different %1RM | Through study completion, an average of 4 weeks | Measuring bar peak velocity and time to reach peak velocity of bar desplacement during bench press and back squat exercises. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Physical activity (METs-min/wk) | Through study completion, an average of 4 weeks | Using IPAQ |
| Mood state | Through study completion, an average of 4 weeks | 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. |
| Adverse effects | Through study completion, an average of 4 weeks | Adverse effects. perception of power, endurance, energy and exertion, as well as heart, muscular and gastrointestinal discomfort. |
| Fat mass | Through study completion, an average of 4 weeks | Using electrical bioimpedance (kg and % of body mass) |
| Fat-free mass | Through study completion, an average of 4 weeks | Using electrical bioimpedance (kg and % of body mass) |
| Dietary (g/kg of macronutrients) | Through study completion, an average of 4 weeks | Using 24-total recall |
Countries
Spain
Outcome results
None listed