Effect of Beetroot Juice Supplements on Lower-limb Strength in Females

Maimónides Biomedical Research Institute of Córdoba11 enrolled

Overview

This study aims to evaluate the effects of beetroot juice supplements on lower-limb strength and muscular endurance in physically active women, due to the presence of NO3- in beetroot juice.

Beetroot juice (BJR) is used as an ergogenic aid, but no study has analyzed its' effects on explosive force production in physically active women. It has been proposed that females could blunt reduction of NO2- to NO based on a higher oxidative skeletal muscle phenotype than males. However, it has been observed a higher increase on plasma NO2- levels after supplementation compared to and a greater enhancement on muscle contractile function. Based on the absence of any study that has analyzed the effect of NO3- supplements on jump ability and power production on weightlifting on female population; the purpose of this study will be to investigate the possible ergogenic effect of BJR on physically active women on explosive force production and muscular endurance in a lower-limb body weightlifting protocol, due to the presence of NO3- in BJR and its effects.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

OTHER

Masking

DOUBLE

Enrollment

Conditions

Muscular Endurance

Interventions

Beetroot juiceDIETARY_SUPPLEMENT

Subjects will drink juice 120 minutes before each visit

Capri-SunOTHER

70 mL of blackcurrant beverage, which is depleted of NO3- will be taken 120 min before each visit.

Eligibility

Sex: FEMALEMin age: 18 YearsMax age: 30 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Physically active females with 18-30 years of age * More than 6 months on RT training programs * Be familiarized with back squat, leg press and leg extension exercises * Not consuming any type of nutritional supplement or anabolic substances in the previous three months or during the study * Not suffering from a musculoskeletal injury that could interfere with the exercise protocol during the investigation Exclusion Criteria: * None

Locations (6)

Studies Research Group in Neuromuscular Responses (GEPREN), University of Lavras

Lavras, Brazil

Maimonides Biomedical Research Institute of Cordoba (IMIBIC), Reina Sofia University Hospital, University of Cordoba

Córdoba, Spain

Metabolism and Investigation Unit, Maimonides Biomedical Research Institute of Cordoba (IMIBIC),Reina Sofia University Hospital, University of Cordoba

Córdoba, Spain

Outcomes

Primary Outcomes

Change of height reached in jump

Evaluated through CMJ (Counter movement jump) test with a recovery period of 45 seconds between jumps.

Time frame: Week 1, 2 and 3.

Secondary Outcomes

Movement velocity

Evaluated at 50% and 75% repetition maximum (RM)

Time frame: Visit 1 (week 1), 2 (week 2) and 3 (week 3).

Power on back squat

Evaluated at 50% and 75% repetition maximum (RM)

Time frame: Visit 1 (week 1), 2 (week 2) and 3 (week 3).

Muscular endurance test

The test consists of three exercises: back squat, leg press and leg extension. Three series will be performed until concentric failure at 75% RM, three minutes of rest between each series.

Time frame: Visit 1 (week 1), 2 (week 2) and 3 (week 3).

Rating of perceived exertion (RPE).

Immediately at the end of the muscular endurance test, participants will be instructed to report their RPE using a scale 1-10 (worse to better outcome).

Time frame: Visit 1 (week 1), 2 (week 2) and 3 (week 3).

Data from ClinicalTrials.gov

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