Nitrate Supplementation on Motor Unit Activity

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

14 participants

Study Classification

INTERVENTIONAL

Study Start Date

2019-12-04

Study Completion Date

2020-03-01

Brief Summary

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This study aimed to assess if nitrate supplementation influence motor unit (MU) activity following a sustained ischemic contraction and whether this is affected by blood flow restriction (BFR) during the recovery period. Fourteen male participants (mean ± SD, 25 ± 6 years) completed two experimental trials following 5-days of supplementation with either nitrate-rich (NIT) or nitrate-depleted (PLA) beetroot juice in a randomized, double-blinded, cross-over design. Intramuscular electromyography was used to assess MU potential (MUP) size and firing rates (MUFR) during a submaximal (25% MVC) sustained isometric contraction with BFR. These variables were also assessed during a 90 s recovery period with the first half completed with, and the second half completed without, BFR. Nitrate supplementation can expedite the recovery of MUP duration following a sustained ischemic contraction in healthy adults. These novel observations improve understanding of the effects of nitrate on the recovery of neuromuscular function post-exercise and might have implications for recovery of muscle contractile function.

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Detailed Description

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Conditions

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Dietary Supplements Healthy

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

OTHER

Blinding Strategy

DOUBLE

Participants Investigators

Supplements were allocated in a randomised order and double-blind design by an independent technician who had no further involvement in this study. The randomization and blinding were held until the end of the study.

Study Groups

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Nitrate supplementation

2 × 70 mL/day shots of concentrate nitrae-rich (\~12.8 mmol/day NO3-) beetroot juice. Two shots were supplemented for 5 days; one each morning (\~9 am) and one each evening (\~9 pm) except for the day of the experimental trial when both shots were taken together 2.5 h before the experimental trial.

Group Type EXPERIMENTAL

Nitrate supplementation

Intervention Type DIETARY_SUPPLEMENT

Participants ingested 2 × 70 mL/day shots of concentrate nitrate-rich (\~12.8 mmol/day nitrate) or nitrate-depleted (\~0.08 mmol/day nitrite) beetroot juice (Beet It, James White Drinks Ltd., Ipswich, UK). Two shots were supplemented for 5 days; one each morning (\~9 am) and one each evening (\~9 pm) except for the day of the experimental trial when both shots were taken together 2.5 h before the experimental trial.

Placebo supplementation

2 × 70 mL/day shots of concentrate nitrate-depleted (\~0.08 mmol/day NO3-) beetroot juice. Two shots were supplemented for 5 days; one each morning (\~9 am) and one each evening (\~9 pm) except for the day of the experimental trial when both shots were taken together 2.5 h before the experimental trial.

Group Type PLACEBO_COMPARATOR

Placebo supplementtaion

Intervention Type DIETARY_SUPPLEMENT

2 × 70 mL/day shots of concentrate nitrate-depleted (\~0.08 mmol/day NO3-) beetroot juice. Two shots were supplemented for 5 days; one each morning (\~9 am) and one each evening (\~9 pm) except for the day of the experimental trial when both shots were taken together 2.5 h before the experimental trial.

Interventions

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Nitrate supplementation

Participants ingested 2 × 70 mL/day shots of concentrate nitrate-rich (\~12.8 mmol/day nitrate) or nitrate-depleted (\~0.08 mmol/day nitrite) beetroot juice (Beet It, James White Drinks Ltd., Ipswich, UK). Two shots were supplemented for 5 days; one each morning (\~9 am) and one each evening (\~9 pm) except for the day of the experimental trial when both shots were taken together 2.5 h before the experimental trial.

Intervention Type DIETARY_SUPPLEMENT

Placebo supplementtaion

2 × 70 mL/day shots of concentrate nitrate-depleted (\~0.08 mmol/day NO3-) beetroot juice. Two shots were supplemented for 5 days; one each morning (\~9 am) and one each evening (\~9 pm) except for the day of the experimental trial when both shots were taken together 2.5 h before the experimental trial.

Intervention Type DIETARY_SUPPLEMENT

Eligibility Criteria

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Inclusion Criteria

* Male between 18 - 30 years
* free from known respiratory insufficiency, cardiovascular disease and neuro-musculo-skeletal problems at present or in the preceding 6 months.
* having at least 5 years competitively (team) sport experience.