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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Oxygen Consumption Clear all
Completed Phase 1Phase 2 Interventional Results available

Pharmacokinetic/Pharmacodynamic Study of Udenafil in Adolescents

NCT02201342
View directory record Official record
Conditions
Single Ventricle Heart Disease After Fontan Surgery
Interventions
Udenafil
Drug
Lead sponsor
Mezzion Pharma Co. Ltd
Industry
Eligibility
14 Years to 18 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
5
States / cities
Indianapolis, Indiana • Ann Arbor, Michigan • Cincinnati, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated May 5, 2025 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

High Speed Circuit Training and Cognition

NCT04022707
View directory record Official record
Conditions
Educational Control, Resistance Training
Interventions
High-speed circuit resistance training, Educational control
Other
Lead sponsor
University of Miami
Other
Eligibility
60 Years to 85 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
2
States / cities
Coral Gables, Florida
Source: ClinicalTrials.gov public record
Updated May 17, 2020 · Synced Sep 24, 2026, 2:27 PM EDT
Not listed Phase 1 Interventional

Atrial Fibrillation: Chronic Beta-blocker Use Versus As-needed Rate Control Guided by Implantable Cardiac Monitor

NCT05745337
View directory record Official record
Conditions
Atrial Fibrillation, Diastolic Dysfunction, HFpEF - Heart Failure With Preserved Ejection Fraction
Interventions
As needed pharmacological rate control with beta-blocker (metoprolol tartrate, metoprolol succinate) or calcium channel blocker (diltiazem, verapamil)
Drug
Lead sponsor
University of Vermont
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Mar 2, 2023 · Synced Sep 24, 2026, 2:27 PM EDT
Withdrawn No phase listed Observational Accepts healthy volunteers

Gas Kinetics and Metabolism in Anesthesia During Non Steady State

NCT00225381
View directory record Official record
Conditions
Anesthetized Healthy Patients (ASA 1 or 2) in the Supine Position, Excluding Head, Neck and Head Surgeries, Anesthetized Patient With Severe Systemic Disease (ASA 3 or 4)
Interventions
connection of measuring device to anesthesia circuit, drawing of blood sample through an arterial line, placed according to clinical criteria by primary anesthesia team, changing operating room bed position (head down and up position), adding PEEP during anesthesia, placement of esophageal Doppler for cardiac output measurements, Humidity sensor, A mixing chamber (bymixer), Pneumotachometer cuvette, Mass spectrometer sampling port
Device · Procedure
Lead sponsor
University of California, Irvine
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2012
U.S. locations
1
States / cities
Orange, California
Source: ClinicalTrials.gov public record
Updated Mar 22, 2021 · Synced Sep 24, 2026, 2:27 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

Rejuvenated RBC and VO2 Max in Healthy Subjects

NCT03089047
View directory record Official record
Conditions
Erythrocyte Transfusion
Interventions
Transfusion of rejuvenated and washed autolgous RBCs, Transfusion of washed autolgous RBCs
Biological
Lead sponsor
Duke University
Other
Eligibility
18 Years to 40 Years
Enrollment
9 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jan 10, 2021 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Phase 2 Interventional

Nesiritide and Vo2 Max in Heart Failure Patients

NCT00240084
View directory record Official record
Conditions
Heart Failure
Interventions
nesiritide (Natrecor(TM))
Drug
Lead sponsor
University of Rochester
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2005
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated Jun 18, 2013 · Synced Sep 24, 2026, 2:27 PM EDT
Terminated Phase 2 Interventional Results available

Thiamine vs. Placebo to Increase Oxygen Consumption After Cardiac Arrest

NCT02974257
View directory record Official record
Conditions
Cardiac Arrest, Shock, Lactic Acidosis, Thiamin Deficiency
Interventions
Thiamine, placebo
Drug · Other
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 9, 2025 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Phase 2 Interventional Results available

Improving Ventilatory Capacity in Those With Chronic High Level SCI

NCT05041322
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
Buspirone, Placebo
Drug
Lead sponsor
Spaulding Rehabilitation Hospital
Other
Eligibility
18 Years to 50 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 17, 2025 · Synced Sep 24, 2026, 2:27 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Comparison of Maximal Oxygen Uptake Obtained Via Seismofit and Cardiopulmonary Exercise Test

NCT07554404
View directory record Official record
Conditions
Healthy
Interventions
VO2 Max
Other
Lead sponsor
Salisbury University
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Salisbury, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 27, 2026 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Effects of Lower Extremity Blood Flow Restriction Training on Power, and Muscle Size.

NCT03983070
View directory record Official record
Conditions
Healthy
Interventions
Seated Rowing Ergometer, Deadlift, Blood flow restriction
Other
Lead sponsor
Campbell University, Incorporated
Other
Eligibility
18 Years to 60 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Buies Creek, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 13, 2022 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Phase 3 Interventional Results available

Fontan Udenafil Exercise Longitudinal Assessment Trial

NCT02741115
View directory record Official record
Conditions
Single Ventricle Heart Disease
Interventions
Udenafil, Placebo
Drug
Lead sponsor
Mezzion Pharma Co. Ltd
Industry
Eligibility
12 Years to 18 Years
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
26
States / cities
Phoenix, Arizona • Los Angeles, California • San Diego, California + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 16, 2025 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Phase 4 Interventional Results available

Phase IV O2 Consumption Study in COPD Patients.

NCT02533505
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD)
Interventions
Budesonide 160 mcg and formoterol fumarate dihydrate 4.5 mcg Inhalation aerosol, Matching Placebo pMDI 160/4.5 μg
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
40 Years to 80 Years
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
5
States / cities
Hartford, Connecticut • Boston, Massachusetts • Charlotte, North Carolina + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 29, 2018 · Synced Sep 24, 2026, 2:27 PM EDT
Withdrawn Not applicable Interventional

Erythropoietin Alfa in Elderly Subjects With Unexplained Anemia

NCT00954486
View directory record Official record
Conditions
Anemia
Interventions
Epoetin alfa
Drug
Lead sponsor
Stanford University
Other
Eligibility
65 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
3
States / cities
Palo Alto, California • Stanford, California • Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 23, 2016 · Synced Sep 24, 2026, 2:27 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Effects of Neo40(TM) With Caffeine on Cycling Time Trial Performance

NCT01710761
View directory record Official record
Conditions
Healthy
Interventions
Placebo, Nitrate supplement with caffeine
Dietary Supplement
Lead sponsor
University of Texas at Austin
Other
Eligibility
21 Years to 49 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2013
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Jan 22, 2013 · Synced Sep 24, 2026, 2:27 PM EDT
Not listed Not applicable Interventional

Comparison of the Q-NRG+ Indirect Calorimetry Device Versus the V(Max) Encore Device in Mechanically Ventilated Children

NCT04482556
View directory record Official record
Conditions
Calorimetry, Indirect, Oxygen Consumption, Metabolism, Mechanical Ventilation
Interventions
Q-NRG+ Indirect Calorimetry Device, V(max) Encore Indirect Calorimetry Device
Device
Lead sponsor
Boston Children's Hospital
Other
Eligibility
10 Years to 18 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 2, 2024 · Synced Sep 24, 2026, 2:27 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Impact of Enhanced External Counterpulsation (EECP) on VO2 MAX

NCT02517671
View directory record Official record
Conditions
Cardiovascular Disease, Pulmonary Disease
Interventions
Enhanced External Counterpulsation (EECP)
Device
Lead sponsor
David Grant U.S. Air Force Medical Center
Federal
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Travis Air Force Base, California
Source: ClinicalTrials.gov public record
Updated Mar 26, 2018 · Synced Sep 24, 2026, 2:27 PM EDT
Completed No phase listed Observational

Assessing Whole-body Metabolism in Gynecologic Cancers in Response to a Single Chemotherapy Cycle and/ or Immunotherapy

NCT07393633
View directory record Official record
Conditions
Gynecologic Cancers
Interventions
Not listed
Lead sponsor
University of Tennessee Graduate School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Knoxville, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Sep 24, 2026, 2:27 PM EDT
Completed No phase listed Observational

Tissue Oxygen Use With Combined Arteriovenous Noninvasive Oximetry

NCT06072755
View directory record Official record
Conditions
Oxygen Consumption
Interventions
Finger pulse oximetry probe, Transreflectance oximetry probe
Device
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 22, 2024 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

VO2 Max: In Vivo Model for Functional Red Cell Testing. Can RECESS be Explained?

NCT02918851
View directory record Official record
Conditions
Healthy
Interventions
Transfusion of 7-day stored red blood cells, Transfusion of 28-day stored red blood cells, Transfusion of 42-day stored red blood cells
Biological
Lead sponsor
Stony Brook University
Other
Eligibility
18 Years to 40 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Stony Brook, New York
Source: ClinicalTrials.gov public record
Updated Apr 7, 2021 · Synced Sep 24, 2026, 2:27 PM EDT
Terminated Phase 4 Interventional Results available

Physiologic Effects of RBC Transfusion

NCT02566577
View directory record Official record
Conditions
Red Blood Cell Transfusion
Interventions
Fresh red blood cell (RBC) transfusion, Storage-aged red blood cell (RBC) transfusion, Electronic infusion pump
Biological · Device
Lead sponsor
Emory University
Other
Eligibility
21 Years to 80 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated May 23, 2019 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Gentle Jogger and Oxygen Consumption

NCT03602365
View directory record Official record
Conditions
Physical Inactivity, Oxygen Consumption
Interventions
Gentle Jogger (GJ)
Device
Lead sponsor
Sackner Wellness Products LLC
Industry
Eligibility
25 Years and older
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 26, 2020 · Synced Sep 24, 2026, 2:27 PM EDT
Completed Not applicable Interventional

Cardiopulmonary Rehabilitation for Adolescents and Adults With Congenital Heart Disease

NCT01822769
View directory record Official record
Conditions
Congenital Heart Disease, Heart Defects, Congenital
Interventions
Cardiopulmonary rehabilitation, Standard of care
Other
Lead sponsor
Boston Children's Hospital
Other
Eligibility
16 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 24, 2018 · Synced Sep 24, 2026, 2:27 PM EDT
Recruiting Phase 1Phase 2 Interventional

Intermittent Hypoxia-initiated Plasticity in Humans: A Multi-pronged Therapeutic Approach to Treat Sleep Apnea and Overlapping Co-morbidities

NCT05558501
View directory record Official record
Conditions
Obstructive Sleep Apnea
Interventions
Mild Intermittent Hypoxia, Sham MIH
Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
30 Years to 60 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Dec 3, 2025 · Synced Sep 24, 2026, 2:27 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Control of Renal Oxygen Consumption, Mitochondrial Dysfunction, and Insulin Resistance

NCT04074668
View directory record Official record
Conditions
Diabetic Kidney Disease, Type 1 Diabetes, Diabetes, Diabetes Mellitus, Diabetes Complications, Diabetic Nephropathies, Type1diabetes, Diabetes, Autoimmune, Autoimmune Diabetes, Juvenile Diabetes, Type 1 Diabetes Mellitus
Interventions
Aminohippurate Sodium Inj 20%, Iohexol Inj 300 milligrams/milliliter (mg/ml), PET/CT Scan, Renal Biopsy
Drug · Radiation · Procedure
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 30 Years
Enrollment
58 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 8, 2023 · Synced Sep 24, 2026, 2:27 PM EDT