Caffeine, CYPA12 and Resistance Exercise
- Conditions
- CYP1A2 PolymorphismCaffeine and Resistance Exercise
- Interventions
- Dietary Supplement: CaffeineDietary Supplement: Placebo
- Registration Number
- NCT06610110
- Lead Sponsor
- Alberto Pérez-López
- Brief Summary
Introduction: Several studies have evaluated and confirmed the ergogenic effect of acute caffeine intake on sports performance, specifically on strength and power performance. However, it remains to be elucidated how CYP1A2 polymorphism influences the acute effects of caffeine on this type of exercise.
Objectives: The present study aims to analyze the effects of acute caffeine intake on muscular strength, power, and endurance performance according to CYP1A2 polymorphism in men and women.
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- RECRUITING
- Sex
- All
- Target Recruitment
- 60
- Age between ≥ 18 and ≤ 35 years.
- Body mass index (BMI) lower than 25 kg/m².
- Physically active subjects (≥150 min/week of moderate exercise).
- Healthy men and women without neurological, cardiometabolic, immunological, or physical conditions that prevent them from performing physical exercise.
- Participants capable of performing the tests.
- History of neuromuscular, cardiac, or diseases that could affect liver or muscle metabolism.
- Use of drugs or other stimulants that interfere with caffeine intake and intestinal absorption during the tests and study.
- Body mass index (BMI) ≥ 25 kg/m².
- Having undergone prolonged periods of forced physical inactivity during the 6 months prior to the study.
- Performing strenuous exercise within 48 hours prior to the tests.
- Failing to replicate the same food intake on the two experimental days.
- Consuming caffeine after 6 PM on the day prior to training or testing.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- CROSSOVER
- Arm && Interventions
Group Intervention Description Genotype AA - Male - Caffeine Caffeine - Genotype AC or CC - Male - Caffeine Caffeine - Genotype AA - Male - Placebo Placebo - Genotype AC or CC - Male - Placebo Placebo - Genotype AA - Female - Caffeine Caffeine - Genotype AC or CC - Female - Caffeine Caffeine - Genotype AA - Female - Placebo Placebo - Genotype AC or CC - Female - Placebo Placebo -
- Primary Outcome Measures
Name Time Method cyp1a2 polymorphism Before the beginning of the trial Using saliva sample and PCR
Mean velocity at different %1RM Through study completion, an average of 2 weeks Measuring bar mean velocity desplacement during bench press and back squat exercises.
Peak velocity at different %1RM Through study completion, an average of 2 weeks Measuring bar peak velocity and time to reach peak velocity of bar desplacement during bench press and back squat exercises.
Mean power output at different %1RM Through study completion, an average of 2 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 2 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 2 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 2 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 2 weeks In bench press and back squat exercise
Maximal Fat Oxidation Rate (MFO) Through study completion, an average of 2 weeks g/min (MFO) using a metabolic chart.
Resting Metabolic Rate (RMR) Through study completion, an average of 2 weeks Kcal at rest (RMR) using a metabolic chart.
- Secondary Outcome Measures
Name Time Method Mood state (tension, depression, anger, vigor, fatigue and confusion) Through study completion, an average of 2 weeks 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 2 weeks perception of power, endurance, energy and exertion, as well as heart, muscular and gastrointestinal discomfort
handgrip and isometric mid-thigh pull tests Through study completion, an average of 2 weeks N generated
Vertical Jump (cm) Through study completion, an average of 2 weeks Vertical Jump (power) Through study completion, an average of 2 weeks
Trial Locations
- Locations (1)
Facultad de Medicina y Ciencias de la Salud. Universidad de Alcalá
🇪🇸Alcalá de Henares, Madrid, Spain