NCT06596395

Effect of Acute Caffeine and Beetroot Juice Intake on Strength, Power, and Muscular Endurance

Effect of Acute Caffeine and Beetroot Juice Intake on Strength, Power, and Muscular Endurance Based on Circadian Rhythms.

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 14 (actual)
• Sponsor: University of Alcala · Academic / Other
• Sex: Male
• Age: 18 Years – 35 Years
• Healthy volunteers: Accepted

Summary

Introduction: Several studies have evaluated and confirmed the ergogenic effect of acute caffeine and beetroot juice intake on sports performance. However, there are few studies focused on the production of strength, power, and muscle endurance, particularly when both supplements are ingested together. Objectives: Evaluate the acute effect of combined and isolated intake of caffeine and beetroot juice on the production of strength, power, and muscle endurance in young adults, analyzing the effect of circadian rhythms (morning vs. afternoon) on the exercise performed (bench press vs. squat). Methods: A total of 12 healthy and physically active participants will be recruited for the study. Through a double-blind, crossover, randomized, and controlled design, participants will ingest: a) Caffeine (3 mg/kg body mass); b) Beetroot juice (70 ml, 6.5 mmol of nitrates); c) Caffeine + Beetroot juice; d) Placebo (maltodextrin, 3 mg/kg). The supplements will be ingested 120 minutes (beetroot juice or placebo) and 60 minutes before (caffeine or placebo), the latter dissolved in 200 ml of water. After the ingestion period, strength, power, and muscle endurance will be analyzed with 1RM tests, strength and power tests at 25%, 50%, 75%, and 90% 1RM, and muscle endurance tests at 65% 1RM, in all cases for squat and bench press exercises. Additionally, dynamometry (manual and the isometric mid-thigh pull test) and vertical jump (squat jump and countermovement jump) will be analyzed. The four experimental conditions will be conducted in the morning (8:00 am to 10:00 am) and in the afternoon (4:30 pm to 6:30 pm).

Conditions

• Dietary Supplements
• Caffeine
• Nitrates
• Sports Performance
• Resistance Exercise

Interventions

Type	Name	Description
DIETARY_SUPPLEMENT	Acute caffeine and beetroot juice	Combined effect of beetroot juice and caffeine intake on muscular strength, power and endurance performance
DIETARY_SUPPLEMENT	Acute caffeine	single effect of caffeine intake on muscular strength, power and endurance performance
DIETARY_SUPPLEMENT	Acute beetroot juice	single effect of beetroot juice intake on muscular strength, power and endurance performance
DIETARY_SUPPLEMENT	Placebo	single effect of placebo on muscular strength, power and endurance performance

Timeline

• Start date: 2023-09-01
• Primary completion: 2024-01-30
• Completion: 2024-05-01
• First posted: 2024-09-19
• Last updated: 2024-09-19

Locations

1 site across 1 country: Spain