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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).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Caffeine - Trial 1 | Experimental |
| |
| Caffeine - Trial 2 | Experimental |
| |
| Caffeine - Trial 3 | Experimental |
| |
| Placebo - Trial 1 | Placebo Comparator |
| |
| Placebo - Trial 2 | Placebo Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Caffeine | Dietary Supplement | acute caffeine intake (3 mg/kg) |
|
| Measure | Description | Time Frame |
|---|---|---|
| Mean velocity at different %1RM | Measuring bar mean velocity desplacement during bench press and back squat exercises. | 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. | Through study completion, an average of 4 weeks |
| Mean power output at different %1RM | Measuring during bench press and back squat exercises. | 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. | 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 | 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 | 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 | Through study completion, an average of 4 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| Physical activity (METs-min/wk) | Using IPAQ | Through study completion, an average of 4 weeks |
| Dietary (g/kg of macronutrients) | Using 24-total recall |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Facultad de Medicina y Ciencias de la Salud. Universidad de Alcalá | Alcalá de Henares | Madrid | 28805 | Spain |
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| ID | Term |
|---|---|
| D002110 | Caffeine |
| ID | Term |
|---|---|
| D014970 | Xanthines |
| D000470 | Alkaloids |
| D006571 | Heterocyclic Compounds |
| D011688 | Purinones |
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Statistician
| Placebo | Dietary Supplement | Acute placebo intake (3 mg/kg of maltodextrin) |
|
| Resting Metabolic Rate (RMR) | Kcal at rest measuring (RMR) using a metabolic chart. | Through study completion, an average of 4 weeks |
| Maximal Fat Oxidation Rate (MFO) | g/min (MFO) using a metabolic chart. | Through study completion, an average of 4 weeks |
| 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. | 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. | Through study completion, an average of 4 weeks |
| Fat mass | Using electrical bioimpedance (kg and % of body mass) | Through study completion, an average of 4 weeks |
| Fat-free mass | Using electrical bioimpedance (kg and % of body mass) | Through study completion, an average of 4 weeks |
| D011687 |
| Purines |
| D006574 | Heterocyclic Compounds, 2-Ring |
| D000072471 | Heterocyclic Compounds, Fused-Ring |