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

Healthy Adults Clinical Trial

Official title:

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

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT05567926
• Other study ID #: BEETROOT
• Status: Completed
• Phase: N/A
• Start date: October 1, 2022
• Est. completion date: October 17, 2022

Study information

• Verified date: October 2022
• Source: University of Primorska
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

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.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 20
• Est. completion date: October 17, 2022
• Est. primary completion date: October 15, 2022
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 30 Years

Eligibility

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

Related Conditions & MeSH terms

• Healthy Adults

Intervention

Dietary Supplement:
• Beetroot juice concentrate (140 ml)
A beetroot juice concentrate (140 ml) will be administered to participants in experimental conditions.
• Blackcurrant juice (placebo)
140 ml of blackcurrant juice with added appropriate amount of sugar to equalize the carbohydrate value and lemon juice fort the taste.

Locations

Country	Name	City	State
Slovenia	University of Primorska Faculty of Health Sciences	Izola

Sponsors (1)

Lead Sponsor	Collaborator
University of Primorska

Country where clinical trial is conducted

Slovenia, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Knee extension strength	The peak force during maximal voluntary contraction of knee extensors	2 hours after the ingestion of beetroot juice or placebo
Secondary	Knee extension explosive strength	The rate of force development during maximal voluntary contraction of knee extensors	2 hours after the ingestion of beetroot juice or placebo
Secondary	Knee extension local muscle endurance	Time to failure of knee muscles at 50 % of maximal force	2 hours after the ingestion of beetroot juice or placebo