Functional Capacity in Obstructive Sleep Apnea

October 28, 2026 updated by: Musa Güneş, Karabuk University

Investigation of Functional Capacity in Patients With Obstructive Sleep Apnea

Obstructive sleep apnea syndrome (OSAS) is a condition characterized by a deterioration in respiratory function and an increase in the activity of accessory respiratory muscles. This condition can affect patients' use of their upper extremities during daily living activities. In this context, our study aimed to examine respiratory function, respiratory muscle strength and endurance, peripheral muscle strength, upper extremity functional exercise capacity, muscle oxygenation, and dyspnea in patients with OSAS, and to compare these parameters with those of healthy controls.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
52

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Turkey (Türkiye)
      • Karabük, Turkey (Türkiye)
        • Recruiting
        • Karabuk University, Physiotherapy and Rehabilitation Application and Research Center
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Individuals with a diagnosis of Obstructive Sleep Apnea Syndromeand healthy individuals will be included in the study.

Description

Inclusion Criteria:

  • Aged 18-65,
  • Diagnosis of Obstructive Sleep Apnea Syndrome (OSAS) confirmed by a pulmonologist following polysomnography,
  • An Apnea-Hypopnea Index (AHI) ≥5 for OSAS,
  • Willingness to participate in the study.

Exclusion Criteria:

  • Having severe orthopedic, neurological, or cardiac conditions,
  • Having a diagnosed pulmonary disease,
  • Having a history of-or currently experiencing-a psychiatric or neurological disorder,
  • Not being willing to participate in the study.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: CASE_CONTROL
  • Time Perspectives: CROSS_SECTIONAL

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Obstructive sleep apnea

Patients with obstructive sleep apnea syndrome will be included in the study.
Control Group

Healthy individuals will be included in the study.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Upper extremity exercise capacity
Time Frame: Baseline

Upper extremity exercise capacity will be evaluated with the six-minute pegboard and ring test (6-PBRT).
Baseline

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Pulmonary function (Forced vital capacity (FVC)
Time Frame: Baseline

Pulmonary function will be evaluated using the spirometry, according to American Thoracic Society and European Respiratory Society criteria. Forced vital capacity (FVC) will be measured.
Baseline
Pulmonary function (Forced expiratory volume in the first second (FEV1)
Time Frame: Baseline

Pulmonary function will be evaluated using the spirometry, according to American Thoracic Society and European Respiratory Society criteria. Forced expiratory volume in the first second (FEV1) will be measured.
Baseline
Pulmonary function (FEV1 / FVC)
Time Frame: Baseline

Pulmonary function will be evaluated using the spirometry, according to American Thoracic Society and European Respiratory Society criteria. FEV1 / FVC will be measured.
Baseline
Pulmonary function (Flow rate 25-75% of forced expiratory volume (FEF 25-75%))
Time Frame: Baseline

Pulmonary function will be evaluated using the spirometry, according to American Thoracic Society and European Respiratory Society criteria. Flow rate 25-75% of forced expiratory volume (FEF 25-75%) will be measured.
Baseline
Pulmonary function (Peak flow rate (PEF))
Time Frame: Baseline

Pulmonary function will be evaluated using the spirometry, according to American Thoracic Society and European Respiratory Society criteria. Peak flow rate (PEF) will be measured.
Baseline
Peripheral muscle strength
Time Frame: Baseline

Peripheral muscle strength will be evaluated with a dynamometer.
Baseline
Respiratory Muscle Strength
Time Frame: Baseline

Maximal inspiratory (MIP) and maximal expiratory (MEP) pressures expressing respiratory muscle strength will be evaluated.
Baseline
Respiratory Muscle Endurance
Time Frame: Baseline

Respiratory muscle endurance will be assessed by the POWERbreathe Wellness (POWERbreathe, Inspiratory Muscle Training (IMT) Technologies Ltd., Birmingham, UK) device and the respiratory muscle endurance test at increased threshold load.
Baseline
Muscle oxygenation
Time Frame: Baseline

Muscle oxygenation assessment will be performed using the Moxy monitor (Moxy, Fortiori Design LLC, Minnesota, USA).
Baseline
Dyspnea
Time Frame: Baseline

Dyspnea is assessed with the modified Medical Research Council (mMRC) dyspnea scale. As the score increases, shortness of breath increases.
Baseline

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Karabuk University

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Rabia Hande Avcı, MD, Karabuk University
  • Study Director: Musa Güneş, PhD, Karabuk University
  • Principal Investigator: Ebrar Tülümenoğlu, MSc (c), Karabuk University
  • Principal Investigator: Nisa Nur Dönmez, MSc (c), Karabuk University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
October 28, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 28, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
October 30, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 28, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 28, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
November 3, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 3, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 28, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • Karabuk_OUAS

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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