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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Respiratory Physiology Clear all
Completed No phase listed Observational Accepts healthy volunteers

Using Ultrasound to Study Respiratory Muscle Function in Critically Ill Patients

NCT03139695
View directory record Official record
Conditions
Injury of Diaphragm, Mechanical Ventilation Complication, Critical Illness
Interventions
Ultrasound
Diagnostic Test
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 7, 2017 · Synced Jul 23, 2026, 12:45 PM EDT
Not yet recruiting Phase 1Phase 2 Interventional

Brain State-dependent PCMS in Chronic Stroke

NCT04830163
View directory record Official record
Conditions
Stroke
Interventions
Brain state-dependent paired corticomotoneuronal stimulation (PCMS)
Combination Product
Lead sponsor
University of Texas at Austin
Other
Eligibility
18 Years and older
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2031
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Dec 5, 2024 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Phase 3 Interventional Results available

A Study to Compare the Efficacy and Safety of Umeclidinium/Vilanterol and Fluticasone Propionate/Salmeterol in Subjects With Chronic Obstructive Pulmonary Disease (COPD)

NCT01817764
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
Umeclidinium/vilanterol, Fluticasone propionate/salmeterol, Placebo
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
40 Years and older
Enrollment
707 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
9
States / cities
Jasper, Alabama • Phoenix, Arizona • San Diego, California + 6 more
Source: ClinicalTrials.gov public record
Updated Nov 7, 2017 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Phase 1 Interventional Results available

Investigation of the Efficacy of Antibiotics on Pulmonary Sarcoidosis

NCT01169038
View directory record Official record
Conditions
Pulmonary Sarcoidosis, Lung Function
Interventions
levaquin; ethambutol; rifampin and azithromycin.
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 75 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 30, 2012 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Not applicable Interventional Results available

An Intervention to Improve Function in Severe Cardiopulmonary Illness

NCT00467298
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD), Heart Failure
Interventions
Exercise adherence, Self-management- prevention of illness, Self-management of illness
Behavioral
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
45 Years and older
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2011
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Apr 1, 2018 · Synced Jul 23, 2026, 12:45 PM EDT
Terminated Phase 2Phase 3 Interventional

Safety and Efficacy of Recombinant Adeno-Associated Virus Containing the CFTR Gene in the Treatment of Cystic Fibrosis

NCT00073463
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
tgAAVCF
Genetic
Lead sponsor
Targeted Genetics Corporation
Industry
Eligibility
12 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2005
U.S. locations
11
States / cities
Birmingham, Alabama • Palo Alto, California • San Diego, California + 7 more
Source: ClinicalTrials.gov public record
Updated Jan 27, 2008 · Synced Jul 23, 2026, 12:45 PM EDT
Recruiting Not applicable Interventional

Stress Management Program

NCT06526585
View directory record Official record
Conditions
Stress, Anxiety
Interventions
Cyclic Sighing Breathing, Box Breathing, Hypnosis, Audiobook
Behavioral
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jun 23, 2026 · Synced Jul 23, 2026, 12:45 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Exhaled Breath Condensate Biomarkers of Inflammation in Individuals With Chronic Cervical Spinal Cord Injury

NCT02235714
View directory record Official record
Conditions
Tetraplegia, Asthma
Interventions
Not listed
Lead sponsor
James J. Peters Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 89 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Sep 9, 2014 · Synced Jul 23, 2026, 12:45 PM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

O2 Transport and Utilization in Health and Lung Disease

NCT04014712
View directory record Official record
Conditions
COPD, Tetrahydrobiopterin Deficiency, Oxidative Stress
Interventions
Tetrahydrobiopterin, Placebo oral tablet
Drug
Lead sponsor
University of Massachusetts, Amherst
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
Amherst, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 18, 2023 · Synced Jul 23, 2026, 12:45 PM EDT
Completed No phase listed Observational Results available

Autologous Stem Cell Treatment for Chronic Lung Disease Study

NCT03044431
View directory record Official record
Conditions
COPD, Interstitial Lung Disease
Interventions
Cell therapy
Procedure
Lead sponsor
Lung Institute
Industry
Eligibility
16 Years and older
Enrollment
207 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Oct 14, 2018 · Synced Jul 23, 2026, 12:45 PM EDT
Completed No phase listed Observational Results available

Progression of Airway Obstruction in Childhood Asthma

NCT00873873
View directory record Official record
Conditions
Asthma
Interventions
Not listed
Lead sponsor
National Jewish Health
Other
Eligibility
16 Years to 40 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 21, 2020 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Phase 4 Interventional Results available

A Randomized Study, Comparing Fluticasone Furoate/Umeclidinium/Vilanterol (FF/UMEC/VI) Single Inhaler Triple Therapy, Versus Multiple Inhaler Therapy (Budesonide/Formoterol Plus Tiotropium) in Subjects With Chronic Obstructive Pulmonary Disease (COPD)

NCT03478683
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive
Interventions
budesonide/formoterol, albuterol/salbutamol, FF/UMEC/VI, Placebo to match budesonide/formoterol, tiotropium, Placebo to match FF/UMEC/VI, placebo to match tiotropium, ELLIPTA, MDI, HandiHaler
Drug · Device
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
40 Years and older
Enrollment
729 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
40
States / cities
Gold River, California • Clearwater, Florida • DeBary, Florida + 31 more
Source: ClinicalTrials.gov public record
Updated Oct 27, 2020 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Phase 1Phase 2 Interventional

Safety and Efficacy of an Antioxidant-rich Multivitamin Supplement in Cystic Fibrosis

NCT01018303
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
AquADEK
Dietary Supplement
Lead sponsor
University of Colorado, Denver
Other
Eligibility
10 Years to 40 Years
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Oct 14, 2012 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Not applicable Interventional

Diaphragm Structure and Function in Childhood Cancer Survivors

NCT06205251
View directory record Official record
Conditions
Childhood Cancer, Cancer Survivors
Interventions
POWERbreathe Plus IMT
Device
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
6 Years to 12 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Jul 23, 2026, 12:45 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Lung and Heart Function Across Decades of Life in Health

NCT07641413
View directory record Official record
Conditions
Pollution Related Respiratory Disorder, Pollution; Exposure, Dyspnea, Cardiopulmonary
Interventions
Healthy control
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
24 Years to 68 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2030
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Jul 23, 2026, 12:45 PM EDT
Withdrawn No phase listed Observational

Electrocardiographic Autonomic Function Measures in Mechanically Ventilated Patients

NCT00844935
View directory record Official record
Conditions
Disorders of the Autonomic Nervous System, Cardiovascular Abnormalities, Respiratory Disorders
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Mar 27, 2012 · Synced Jul 23, 2026, 12:45 PM EDT
Recruiting Not applicable Interventional

Dietary Intervention to Mitigate Post-Acute COVID-19 Syndrome

NCT05977179
View directory record Official record
Conditions
Post-Acute COVID-19 Syndrome, Fatigue
Interventions
Dietary intervention to mitigate Post-Acute COVID-19 Syndrome, Attention Control
Other
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
50 Years to 94 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Jul 23, 2026, 12:45 PM EDT
Recruiting No phase listed Observational

Intensive Multimodal Neurorehabilitation Targeting Neuroplasticity in Pediatric Neurodevelopmental and Chromosomal Disorders

NCT07493096
View directory record Official record
Conditions
Neurodevelopmental Disorders, Neurodevelopmental Disorders (NDD), Neurodevelopmental Disorders and Developmental Abnormalities, Developmental Delay (Disorder), Cerebral Palsy (CP), Cerebral Palsy Hemiparetic Cerebral Palsy Spasticity Gait Disorders, Neurologic Postural Balance Impairment, Cerebral Palsy Infantile, Cerebral Palsy Spastic Hemiplegic, Cerebral Palsy, Dyskinetic, Autism Spectrum Disorder, Autism Spectrum Disorder (ASD, Hypoxic Ischemic Encephalopathy, Hypoxic Ischemic Encephalopathy (HIE), Traumatic Brain Injury (TBI), Sensory Processing Disorder, Chromosomal Abnormalities, Genetic Disorders, Down Syndrome (Trisomy 21), Fragile X Syndrome (FXS), RETT Syndrome With Proven MECP2 Mutation, Williams Syndrome, 22q11.2 Deletion Syndrome, Sensorimotor Integration
Interventions
Not listed
Lead sponsor
Healing Hope International
Other
Eligibility
4 Years to 12 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2036
U.S. locations
1
States / cities
The Woodlands, Texas
Source: ClinicalTrials.gov public record
Updated Mar 24, 2026 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Phase 3 Interventional

A Study Of GW685698X For The Treatment Of Perennial Allergic Rhinitis In Pediatrics

NCT00116883
View directory record Official record
Conditions
Rhinitis, Allergic, Perennial
Interventions
GW685698X aqueous nasal spray
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
2 Years to 11 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005
U.S. locations
12
States / cities
Hot Springs, Arkansas • Little Rock, Arkansas • Long Beach, California + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2016 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Acute Intermittent Hypoxia and Breathing in Neuromuscular Disease

NCT03645031
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis (ALS), Neuromuscular Diseases
Interventions
Acute Intermittent Hypoxia, Sham Acute Intermittent Hypoxia
Other
Lead sponsor
University of Florida
Other
Eligibility
21 Years to 75 Years
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
2
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 14, 2025 · Synced Jul 23, 2026, 12:45 PM EDT
Recruiting Not applicable Interventional

The Allergen Reduction and Child Health Study (ARCHS)

NCT04331353
View directory record Official record
Conditions
Asthma in Children
Interventions
Comparator 1 (tailored approach), Comparator 2 (insecticidal bait)
Behavioral
Lead sponsor
Tulane University
Other
Eligibility
5 Years to 17 Years
Enrollment
290 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2028
U.S. locations
1
States / cities
New Orleans, Louisiana
Source: ClinicalTrials.gov public record
Updated Sep 8, 2025 · Synced Jul 23, 2026, 12:45 PM EDT
Recruiting Not applicable Interventional

Symptoms and Functions in Patients With COPD and Chronic Bronchitis Switching From CIG to THS

NCT07108166
View directory record Official record
Conditions
COPD, Smoking, Tobacco Use
Interventions
Cigarette, THS
Other
Lead sponsor
Philip Morris Products S.A.
Industry
Eligibility
40 Years and older
Enrollment
290 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
46
States / cities
Clearwater, Florida • Coral Gables, Florida • Davie, Florida + 24 more
Source: ClinicalTrials.gov public record
Updated Jun 14, 2026 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Nitrate Supplementation During Final Examination Stress

NCT03159273
View directory record Official record
Conditions
Airway Disease
Interventions
Beetroot Juice Group
Dietary Supplement
Lead sponsor
Southern Methodist University
Other
Eligibility
18 Years to 50 Years
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 22, 2018 · Synced Jul 23, 2026, 12:45 PM EDT
Completed Phase 1 Interventional

Lung Transplant Subjects Using 19F MRI

NCT02019251
View directory record Official record
Conditions
Post Single or Double Lung Transplant
Interventions
perfluorinated gas/oxygen mixture, MRI
Drug · Device
Lead sponsor
Hal C Charles
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 17, 2014 · Synced Jul 23, 2026, 12:45 PM EDT