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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Caffeine - Males | Experimental |
| |
| Placebo - Males | Placebo Comparator |
| |
| Caffeine - Females | Experimental |
| |
| Placebo - Females | Placebo Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Caffeine plus Resistance training | Dietary Supplement | Acute caffeine intake (3 mg/kg) prior each resistance training session of a 8 weeks training program. |
|
| 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 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. | Through study completion, an average of 12 weeks |
| Mean power output at different %1RM | Measuring during bench press and back squat exercises. | 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. | 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 | 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 | 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 | Through study completion, an average of 12 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| Resting Metabolic Rate (RMR) | Kcal at rest using a metabolic chart. | Through study completion, an average of 12 weeks |
| Maximal Fat Oxidation Rate (MFO) | g/min using a metabolic chart. |
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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 |
| D055070 | Resistance Training |
| ID | Term |
|---|---|
| D014970 | Xanthines |
| D000470 | Alkaloids |
| D006571 | Heterocyclic Compounds |
| D011688 | Purinones |
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Randomized controlled trial
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Statistician
| Placebo + Resistance training | Other | Acute placebo intake (3 mg/kg of maltodextrin) prior each resistance training session of a 8 weeks training program. |
|
| Through study completion, an average of 12 weeks |
| Fat mass | Using electrical bioimpedance (kg and % of body mass) | Through study completion, an average of 12 weeks |
| Fat-free mass | Using electrical bioimpedance (kg and % of body mass) | Through study completion, an average of 12 weeks |
| Physical activity (METs-min/wk) | Using IPAQ | Through study completion, an average of 12 weeks |
| Dietary (g/kg of macronutrients) | Using a 24-total recall | 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. | 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. | Through study completion, an average of 12 weeks |
| D011687 |
| Purines |
| D006574 | Heterocyclic Compounds, 2-Ring |
| D000072471 | Heterocyclic Compounds, Fused-Ring |
| D005081 | Exercise Therapy |
| D012046 | Rehabilitation |
| D000359 | Aftercare |
| D003266 | Continuity of Patient Care |
| D005791 | Patient Care |
| D013812 | Therapeutics |
| D026741 | Physical Therapy Modalities |
| D064797 | Physical Conditioning, Human |
| D015444 | Exercise |
| D009043 | Motor Activity |
| D009068 | Movement |
| D009142 | Musculoskeletal Physiological Phenomena |
| D055687 | Musculoskeletal and Neural Physiological Phenomena |