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Completed

NCT Number: NCT06767176

Impact of Dietary Nitrate Supplementation on VO2max During Ramadan Fasting in Healthy Adults

The goal of this clinical trial is to determine if beetroot juice supplementation changes exercise performance following one week of Ramadan fasting in young, healthy adults. The main question it aims to answer is:

Does daily beetroot juice supplementation change VO2 max in fasting individuals during the first week of Ramadan?

Participants will:

Visit the lab before the start of Ramadan and after one week of fasting If assigned to intervention group, consume daily shots of beetroot juice (70ml) during the first week of Ramadan fasting Perform maximal exercise testing on a cycle ergometer

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Key information

Conditions

Ramadan Fasting Behavior Fasting Feeding Behavior

Age range

18 year–50 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Guelph

Guelph, Canada

About this study

Recent literature demonstrates data showing a decrease in VO2max during the first week of Ramadan fasting. This is a practice observed by millions around the world every year, where individuals abstain from food and water from sunrise to sunset, dictated by the lunar calendar. Dietary nitrate consumption has been shown to increase VO2max and exercise performance. Therefore, the primary purpose of this study is to investigate whether dietary nitrate, in the form of beetroot juice, can help mitigate the decrease in VO2 max during the first week of Ramadan fasting.

24 young healthy adults will be recruited to undergo these two visits. The first visit will assess maximal oxygen uptake to determine aerobic fitness and metabolic exercise intensity zones under non-fasting conditions. The second visit will be completed after one week of Ramadan fasting. If assigned to the intervention group, participants will consume one shot (70ml) of Blonyx - Beet It Sport Nitrate 400 beetroot juice every day. Each shot contains 400mg of nitrates. Urine Specific Gravity will be measured after each visit to assess hydration status. The intervention group will also undergo Single Blood Draws after each visit to assess nitrate concentrations before and after a week of consumption.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Free of known cardiovascular or metabolic diseases or sleep disorders
  • No history of smoking (within the past 3 months)
  • Able to engage in physical activity assessed through the physical activity readiness questionnaire (PAR-Q+)
  • No prescription of chronic medications other than oral contraceptives
  • Able to abide by fasting protocols for all visits
  • Individuals who are not allergic to ultrasound gel or beetroot juice
  • Individuals who are not pregnant

Exclusion criteria

  • Individuals diagnosed with cardiovascular or metabolic disease or sleep disorders
  • Has a history of smoking (within the past 3 months)
  • Not ready to engage in physical activity as assessed by the PAR-Q+
  • Individuals prescribed chronic medications other than oral contraceptives
  • Unable to abide by fasting protocols for any testing visit
  • Allergic to ultrasound gel or beetroot juice
  • Pregnancy

Treatment and study plan

Beetroot Juice (Beet-It Stamina Shot) & Supervised Exercise Training

Dietary Supplement

7 doses, taken daily, 70 ml shots, consumed in the morning before the start of fasting

Primary outcomes

  1. VO2 max

    Time frame: One--week differences between before and after 1 week of fasting, nitrate supplementation if in intervention group

    Maximal Oxygen Uptakes will be assessed to analyze aerobic capacity and fitness under fasting conditions.

Secondary outcomes

  1. Nitrate Concentration levels

    Time frame: Comparison between blood before and after nitrate supplementation: one week

    Single blood draws will be taken after each visit for the nitrate supplementation group

Sponsors and collaborators

Lead sponsor

University of Guelph

Other

Registry information

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
Jan 9, 2025
Registry last updated
May 1, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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