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Effect of Pre-exercise Inhalation of Molecular Hydrogen on Metabolic Response During Graded Exercise in Healthy Women

22 juni 2026 bijgewerkt door: Jakub Krejci, Palacky University

Effect of Repeated Pre-exercise Inhalation of Molecular Hydrogen on Metabolic Response During Graded Exercise in Healthy Women: A Randomized, Double-blind, Placebo-controlled Crossover Trial

The goal of this clinical trial is to evaluate if molecular hydrogen can reduce the metabolic response during graded exercise in healthy women aged 18-30 years. The main questions it aims to answer are:

  • Does molecular hydrogen reduce the respiratory exchange ratio?
  • Does molecular hydrogen reduce oxygen uptake?

Researchers will compare molecular hydrogen to a placebo (ambient air containing no molecular hydrogen) to see if molecular hydrogen reduces the metabolic response.

Participants will:

  • Inhale molecular hydrogen for 60 minutes each day for 7 days.
  • Undergo an exercise testing twice after a two-week washout period.

Studie Overzicht

Toestand

Werving

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

This crossover trial examines the effect of repeated inhalation of molecular hydrogen on the metabolic response during graded exercise in healthy female participants. Each participant undergoes two experimental interventions (molecular hydrogen and placebo) in random order, separated by a two-week washout period. The order of the interventions is randomized using a computer random number generator. Each intervention consists of 7 days, during which participants inhale either molecular hydrogen or placebo gas for 60 minutes daily under resting conditions. Molecular hydrogen is produced by electrolysis of water and mixed with ambient air in the chamber to achieve a hydrogen concentration of 3.75 % which is below the lower explosive limit. This gas is administered via a face mask connected to an Ambu bag system with a one-way valve to ensure standardized delivery. Placebo is produced by pumping ambient air without molecular hydrogen. Molecular hydrogen is colorless, odorless, and tasteless, making it indistinguishable from placebo by human senses. On the 7th day of each intervention, participants undergo a graded exercise test on an bicycle ergometer immediately following the final inhalation session. The protocol consists of 8 incremental steps with the workload increasing from 0.5 to 2.25 W/kg. Outcome measures collected at rest before exercise and during exercise include cardiorespiratory variables, capillary blood biomarkers, and perceived exertion. Statistical analysis is based on a two-way analysis of variance for repeated measures, and p < 0.05 is considered statistically significant.

Studietype

Ingrijpend

Inschrijving (Geschat)

22

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Contact Back-up

Studie Locaties

  • Tsjechië
      • Olomouc, Tsjechië, 77111
        • Werving
        • Palacky University, Faculty of Physical Culture
        • Contact:

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Volwassen

Accepteert gezonde vrijwilligers

Ja

Beschrijving

Inclusion Criteria:

  • Healthy female participants.
  • Regular menstrual cycle with exercise testing scheduled outside the menstrual phase.
  • Signed informed consent.

Exclusion Criteria:

  • Pregnancy or breastfeeding.
  • History or presence of cardiovascular disease.
  • History or presence of respiratory disease.
  • Regular use of medications affecting metabolism.
  • Use of dietary supplements affecting metabolism within 14 days prior to intervention.
  • Strenuous physical activity within 24 hours prior to exercise testing.
  • Any contraindication to exercise testing or study participation determined by a physician.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Fundamentele wetenschap
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Crossover-opdracht
  • Masker: Dubbele

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Molecular hydrogen
Molecular hydrogen inhalation for 60 minutes daily for 7 days.
Ander: Molecular hydrogen
Gas mixture containing 3.75% molecular hydrogen and ambient air.
Andere namen:
  • H2 Air-Blend Generator (H2 Medical Technologies, Ostrava, Czech Republic)
Placebo-vergelijker: Placebo
Ambient air inhalation for 60 minutes daily for 7 days.
Ander: Placebo
Ambient air without molecular hydrogen.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Respiratory exchange ratio
Tijdsspanne: Change after 2 weeks of crossover.
Respiratory exchange ratio is measured using an Ergostik analyser (Geratherm Respiratory, Bad Kissinger, Germany) breath by breath during the exercise, and the average is calculated for 6-minute segments for subsequent analysis.
Change after 2 weeks of crossover.

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Oxygen uptake
Tijdsspanne: Change after 2 weeks of crossover.
Oxygen uptake is measured using an Ergostik analyser (Geratherm Respiratory, Bad Kissinger, Germany) breath by breath during the exercise, and the average is calculated for 6-minute segments for subsequent analysis.
Change after 2 weeks of crossover.
Carbon dioxide production
Tijdsspanne: Change after 2 weeks of crossover.
Carbon dioxide production is measured using an Ergostik analyser (Geratherm Respiratory, Bad Kissinger, Germany) breath by breath during the exercise, and the average is calculated for 6-minute segments for subsequent analysis.
Change after 2 weeks of crossover.
Minute ventilation
Tijdsspanne: Change after 2 weeks of crossover.
Minute ventilation is measured using an Ergostik analyser (Geratherm Respiratory, Bad Kissinger, Germany) breath by breath during the exercise, and the average is calculated for 6-minute segments for subsequent analysis.
Change after 2 weeks of crossover.
Breathing frequency
Tijdsspanne: Change after 2 weeks of crossover.
Breathing frequency is measured using an Ergostik analyser (Geratherm Respiratory, Bad Kissinger, Germany) breath by breath during the exercise, and the average is calculated for 6-minute segments for subsequent analysis.
Change after 2 weeks of crossover.
Heart rate
Tijdsspanne: Change after 2 weeks of crossover.
Heart rate is continuously recorded during the exercise using a Polar H10 chest strap (Polar, Kempele, Finland), and the average is calculated for 6-minute segments for subsequent analysis.
Change after 2 weeks of crossover.
Blood lactate concentration
Tijdsspanne: Change after 2 weeks of crossover.
Capillary blood lactate concentration is assessed at baseline (resting condition) and during the final minute of each exercise step using a Lactate Scout device (EKF Diagnostics, Barleben, Germany).
Change after 2 weeks of crossover.
Rating of perceived exertion
Tijdsspanne: Change after 2 weeks of crossover.
Participants are asked to subjectively rate their perceived exertion at specified time points - at rest and subsequently in the last minute of each exercise step. The Borg's scale 6-20 is used, where 6 means "no exertion" and 20 means "maximal exertion".
Change after 2 weeks of crossover.

Andere uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Blood glucose concentration
Tijdsspanne: Change after 2 weeks of crossover.
Capillary blood glucose concentration is assessed at baseline (resting condition) and during the final minute of each exercise step using an Accu-Chek Inform II device (Roche Diagnostics, Manheim, Germany).
Change after 2 weeks of crossover.

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Palacky University

Onderzoekers

  • Hoofdonderzoeker: Tereza Rysava, Palacky University

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Werkelijk)

22 juni 2026

Primaire voltooiing (Geschat)

1 december 2026

Studie voltooiing (Geschat)

1 december 2026

Studieregistratiedata

Eerst ingediend

8 juni 2026

Eerst ingediend dat voldeed aan de QC-criteria

8 juni 2026

Eerst geplaatst (Werkelijk)

12 juni 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

25 juni 2026

Laatste update ingediend die voldeed aan QC-criteria

22 juni 2026

Laatst geverifieerd

1 juni 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • FTK_2026_14

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

JA

Beschrijving IPD-plan

All IPD that underlie results in a publication.

IPD-tijdsbestek voor delen

Beginning 1 month after the publication of results with no end date.

IPD-toegangscriteria voor delen

Anonymized IPD will be uploaded to an open-access data repository.

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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