Acute Effects of Beetroot Juice on Isometric Knee Extension Strength, Explosive Strength and Local Muscular Endurance

University of Primorska

Status: Completed

Conditions: Healthy Adults

Treatments: Dietary Supplement: Blackcurrant juice (placebo); Dietary Supplement: Beetroot juice concentrate (140 ml)

Study type: Interventional

Funder types: Other

Identifiers

NCT05567926

BEETROOT

Details and patient eligibility

About

This is a double-blind placebo-controlled cross-over trial that aims to determine the acute effect of beetroot juice ingestion on isometric knee extension strength, explosive strength and local muscular endurance.

Full description

The study aims to determine whether concentrated beetroot juice has an acute effect on isometric strength of the knee muscles and the rate of force development in knee extension, as well as endurance of the same muscle. This will be a cross-over study. 20 subjects will be randomly selected to the experimental group or control group; after 1 week, participants will repeat the measurements in the other condition. Subjects will consume 140 ml of beetroot juice extract 2.5 hours before the measurement or placebo (140 ml of blackcurrant juice with added appropriate amount of sugar to equalize the carbohydrate value and lemon juice fort the taste). An isometric dynamometer will be used to measure the isometric strength of the knee extensors. Investigators will quantify peak force, rate of force development, endurance of knee extensors at 50 % of the maximal force, and the force recovery after a fatiguing protocol.

Enrollment: 20 patients

Sex: All

Ages: 18 to 30 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Age between 18 and 30 years
• Physically active and healthy athletes (recreational or professional)

Exclusion criteria

• Cardiovascular, pulmonary, metabolic, neurological diseases and musculoskeletal injuries
• Smokers
• Consumption of drugs such as antacids and proton pump inhibitors in the previous 3 months
• Pregnant or breastfeeding women
• Beetroot allergic participants

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Triple Blind

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20 participants in 2 patient groups, including a placebo group

Experimental condition, receiving beetroot juice supplement

Experimental group

Description:

Participants will receive beetroot juice intervention in the experimental condition.

Treatment:

Dietary Supplement: Beetroot juice concentrate (140 ml)

Placebo condition

Placebo Comparator group

Description:

Participants will receive placebo (blackcurrant juice) in the placebo condition

Treatment:

Dietary Supplement: Blackcurrant juice (placebo)