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Performance Enhancing Product UseNCT05295836

Effects of Acute Glycerol Ingestion on Performance, Metabolic and Biochemical Markers in International Athletes

A study testing GLYCEROL in people with Performance Enhancing Product Use and Change, Body Weight, run by Francisco Javier Martínez Noguera at 1 site in Spain.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This clinical study evaluates the acute effect of glycerol ingestion on performance (power output), weight, urine specific gravity, biochemical (antioxidants and lactate) and metabolic (indirect calorimetry) markers in international athletes in hot conditions. Read more about this study

Who is it for?
Ages 25 to 35 years, men onlyHealthy volunteers can take part
What is being tested?
GLYCEROL
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
4 participants
Where
1 siteSpain
Study dates
10 Feb 2022to 25 Feb 2022
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 25 to 35 years
  • Men only
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Be an international athlete with the Spanish national athletics team.

Who cannot join

  • Are smokers or regular alcohol drinkers,
  • Have a metabolic, cardiorespiratory or digestive pathology or anomaly,
  • Have an injury in the prior 6 months
  • Are supplementing or medicating in the prior 2 weeks
  • Have non-normal values in the blood analysis parameters.

Trial locations and contacts

1 site in 1 country.

Spain1 site
  • Research Center for High Performance Sport. Catholic University of Murcia

    La Ñora, Murcia, 30830

Other trials in Spain

About this study

This clinical study evaluates the acute effect of glycerol ingestion on performance (power output), weight, urine specific gravity, biochemical (antioxidants and lactate) and metabolic (indirect calorimetry) markers in international athletes in hot conditions. The investigators hypothesized that acute glycerol ingestion can prevent performance loss (power generated at submaximal intensity) in hot conditions. To justify this hypothesis, the investigators will measure the aforementioned markers, which could establish a cause-effect relationship between acute glycerol intake and decreased performance loss in hot conditions.

Read the detailed description

All participants will be informed about the procedures and provide signed informed consent. The study will be conducted according to the guidelines of the Helsinki Declaration for Human Research and the protocol was approved by the Ethics Committee/Institutional Review Catholic University of Murcia (Code: CE091802).

Study design

This is a randomized crossover study. There are 3 types of intervention: water intake of 26 mL/kg/weight at 16°C (CON), 26 mL/kg/weight + placebo at 28°C (PLA) and intake of 1.2 g glycerol + 26 mL/kg/weight at 28°C (GLY). In addition, athletes will be instructed to take a individualized diet in relation to macronutrients (verified by dietary record) and they will follow their adjusted training schedule so that there would be no effect on the tests. Participants in both groups will be instructed not to consume supplements 3 weeks prior to the start of the study.

Procedures

Participants will visit the laboratory on five occasions. Visit 1 consists of a medical examination and a blood draw to determine health status. At visit 2, after a dinner the night before and a standard breakfast, an incremental test will be performed to determine the exercise zones in the rectangular test. At visits 3, 4 and 5, a record of the diet (individually set) will be performed regarding the former 7 days, followed by a rectangular treadmill test.

Visit 1:

Health status blood test: A general blood test will be performed. The blood will be drawn through a vein. (Fasting) Medical examination: A medical history of family and personal history, an electrocardiogram (ECG) at rest and a medical examination (auscultation, blood pressure, etc.) will be carried out to certify that the person is healthy and is not at risk to participate in the study. (Fasting)

Visits 2:

Incremental test with final ramp test will be performed on a cycle ergometer using a metabolic cart (Metalyzer 3B. Leipzig, Germany) to determine maximal fat oxidation zone (FatMax), ventilatory thresholds 1 (VT1) and 2 (VT2) and maximal oxygen consumption (VO2max). Participants will begin cycling at 35W for 2 min, increasing then by 35W every 2 min until RER>1.05, initializing then the final ramp (+35W·min-1) until exhaustion.

Visits 3:

The rectangular test will be performed on a treadmill using the speed values obtained in the incremental test (15 sets x 2 min at 95% with 2:30 recovery at 85% of maximum speed between sets). Cardiorespiratory variables (VO2, VCO2, VO2R, VE/VO2, VE/VCO2, VE/VCO2, respiratory coefficient, respiratory frequency, carbohydrate oxidation (CHO), fat oxidation (FAT), running economy and energy expenditure) will be determined in the 1st, 5th, 10th and 15th series.

For power measurement, each participant will wear the Stryd power meter, which is an inertial sensor (9.1 g) mounted on the foot, firmly attached to the shoe and according to the manufacturer's recommendations. The device stores at a sampling rate of 1 Hz the following variables: estimated power (PO), pace, cadence, leg sprint stiffness (LSS), form power, form power ratio, ground contact time (GCT), vertical oscillation, stride length. These variables will then be determined in the 1st, 5th, 10th and 15th series of the rectangular test. According to information from the Stryd team, the device is operational out of the box and should not require any calibration, accepting a measurement error of 3 percent. Participants will fill in their height and body mass prior to use, which is required for PO estimation. The firmware version that will be used is 2.1.16 (released in August 2020).

For lactate and antioxidant measurements, a Lactate Pro 2 meter and eBQC lab will be used on finger capillary blood at rest, after the 5th, 10th and after completion of the rectangular test.

For body temperature, the investigators will use an infrared thermographic camera (FLIR) to measure heat distribution (head, trunk, lower and upper limbs in both anterior and posterior aspects of the body).

Urine Samples Urine will be collected from the intake of water or water + glycerol or water + placebo until the start of the rectangular test and up to one hour after the rectangular test. The volume of urine excreted pre and post rectangular test will be recorded and the urine specific gravity will be analyzed.

Being tested
PLACEBO, GLYCEROL
Keywords
Power, Performance, Thermography, Metabolism, Endurance Sport, Ergogenic Aids, Oxygen uptake, Hydration, Hyperhydration
Medical subject headings
Body Weight Changes, Body Temperature Changes, Hyperlactatemia, Somatosensory Disorders, Water Intoxication

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PLACEBOOther

    Athletes will perform the rectangular test at a temperature of 28°C and ingested 26 mL/kg body weight + placebo one and half hours before the test.

  • GLYCEROLDietary supplement

    Athletes will perform the rectangular test at a temperature of 28°C and ingested 26 mL/kg body weight + 1.2 g of glycerol one and half hours before the test.

Study groups in NCT05295836
Study groupRoleWhat they receive
CONTROLNo interventionIn this phase of the study, the rectangular test will be performed in conditions of 16°C and 25-30% humidity, intaking 26 mL/kg/body weight of water one and a half hours before the test.
PLACEBO (PLA)Placebo comparatorIn this intervention, subjects will perform the rectangular test at 28°C and 25-30% humidity, ingesting 26 mL/kg/body weight of water and placebo one and a half hours before the test.
Receives: Other: PLACEBO
GLYCEROL (GLY)ExperimentalIn this intervention, subjects will perform the rectangular test at 28°C and 25-30% humidity, ingesting 1.2 g + 26 mL/kg/body weight of water one and a half hours before the test.
Receives: Dietary Supplement: GLYCEROL

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Body weight

    Record body weight before and after the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  2. Urine specific gravity

    Record urine specific gravity by means a digital refractometer (Atago) before and after the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  3. Power output

    Record the power produced by means the stryd sensor (shoe) in the 1st, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  4. Body temperature

    Record body temperature by thermography of the head, trunk, and lower limbs, anterior and posterior in rest, after 5th and 10th series, and after completion of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

Secondary outcomes (21)
  1. Lactate

    Record lactate in rest, after 5th and 10th series, and after completion of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  2. Measurement of fast- and slow-acting antioxidants (Q1 and Q2) and total antioxidant capacity by a portable analyzer eBQC0101

    Record the antioxidant markers in rest, after 5th and 10th series, and after completion of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  3. Heart rate

    Record the heart rat in rest,1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  4. VO2

    Record the oxygen uptake (L/min) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  5. CO2

    Record the carbon dioxide exhalation (L/min) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  6. RER

    Record respiratory exchange ratio in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  7. VE

    Record ventilation (L/min) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  8. FAT ox

    Record fat oxidation (g/h) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  9. HC ox

    Record carbohydrate oxidation (g/h) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  10. FR

    Record respiratory frequency (breaths/min) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  11. EE

    Record energy expenditure (kcal/h) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  12. V'E/V'O2

    Record ventilatory equivalents for oxygen (L/min) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  13. V'E/V'CO2

    Record ventilatory equivalents for carbon dioxide (L/min) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  14. VO2/R

    Record oxygen consumption relative to weight (mL/min/kg) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  15. Cadence

    Record cadence (steps per minute) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  16. Leg spring stiffness

    Record leg spring stiffness (kN/m) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  17. Form power ratio

    Record form power ratio in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  18. Form power

    Record form power (W) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  19. Ground contact time

    Record ground contact time (ms) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  20. Vertical oscillation

    Record vertical oscillation (cm) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

  21. PO/R

    Record power output relative to weight (W/kg) in 1th, 5th, 10th and 15th series of the rectangular test

    Measured: Throughout study completion, an average of 3 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted25 Mar 2022
  2. Study start10 Feb 2022
  3. Primary completion25 Feb 2022
  4. Study completion25 Feb 2022

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Crossover
Model description
A randomized crossover study will be conducted, in which 4 international walkers will perform 3 different conditions: CON) water intake of 26 mL/kg/weight at 16°C; PLA) 26 mL/kg/weight + placebo at 28°C and GLY) intake of 1.2 g glycerol + 26 mL/kg/weight at 28°C.
Masking
Single blind
Who is masked
Participant
Enrolment
4 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05295836
Sponsor's protocol ID
CE102102
Status last verified
Mar 2022
First submitted
24 Feb 2022
Last updated
25 Mar 2022
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A study testing GLYCEROL in people with Performance Enhancing Product Use and Change, Body Weight, run by Francisco Javier Martínez Noguera at 1 site in Spain.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 1 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 25 Mar 2022. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Spain. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Body weight (time frame: Throughout study completion, an average of 3 weeks). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 25 Mar 2022.

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