The Impact of Diaphragmatic Breathing Instructions and Inspiratory Pressures on Diaphragm Contraction in Healthy Adults
NCT ID: NCT06347549
Last Updated: 2025-01-28
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
62 participants
OBSERVATIONAL
2024-04-08
2024-07-16
Brief Summary
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This study aims (1) to investigate the relationship between sternocleidomastoid muscle recruitment and diaphragm thickness fraction during increasing inspiratory resistance in healthy adults; (2) to compare diaphragmatic and sternocleidomastoid muscle recruitment patterns with and without a standard diaphragmatic breathing instruction with increasing inspiratory resistance in healthy adults.
Participants will be asked to breathe through a pressure threshold inspiratory loading device under different inspiratory resistances with and without a standard diaphragmatic breathing instruction. sternocleidomastoid muscle activity will be measured with surface electromyography, and diaphragm thickness will be assessed with ultrasonography.
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Detailed Description
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The entire recording procedure will be repeated on a separate day. During the repeat measurements, participants will be provided with specific breathing instruction to focus on the use of the diaphragm and to inhale air to the lower part of the chest. Practice trials will be conducted to ensure participant's understanding of diaphragmatic breathing.
Conditions
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Study Design
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CASE_CROSSOVER
CROSS_SECTIONAL
Study Groups
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Healthy adults
Participants ≥18 years of age with normal health will be recruited in this study.
Various intensities of inspiratory muscle training
Each participant will be instructed to use a pressure threshold inspiratory loading device to perform, in random order, 10 breaths at an inspiratory intensity of 30%, 40%, 50%, 60%, 70%, and 80% of their maximum inspiratory pressure (MIP). A rest period of 15 minutes will be allowed between each inspiratory pressure set of 10 breaths. Simultaneous surface electromyographic (sEMG) recording of the right sternocleidomastoid muscle and ultrasound of right diaphragmatic thickness will be conducted during each breath.
The entire recording procedure will be repeated on a separate day. During the repeat measurements, participants will be provided with specific breathing instruction to focus on the use of the diaphragm and to inhale air to the lower part of the chest.
Interventions
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Various intensities of inspiratory muscle training
Each participant will be instructed to use a pressure threshold inspiratory loading device to perform, in random order, 10 breaths at an inspiratory intensity of 30%, 40%, 50%, 60%, 70%, and 80% of their maximum inspiratory pressure (MIP). A rest period of 15 minutes will be allowed between each inspiratory pressure set of 10 breaths. Simultaneous surface electromyographic (sEMG) recording of the right sternocleidomastoid muscle and ultrasound of right diaphragmatic thickness will be conducted during each breath.
The entire recording procedure will be repeated on a separate day. During the repeat measurements, participants will be provided with specific breathing instruction to focus on the use of the diaphragm and to inhale air to the lower part of the chest.
Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
* Participants with known cardiovascular, pulmonary, musculoskeletal or psychiatric disorders.
* Participants with respiratory symptoms (from flu or other respiratory infection during the 2 weeks prior to measurements.
* Participants can not cooperate the maximal inspiratory pressure measurement.
18 Years
80 Years
ALL
Yes
Sponsors
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Hong Kong Metropolitan University
OTHER
Responsible Party
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LIU FANG
PhD student
Principal Investigators
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William Tsang
Role: PRINCIPAL_INVESTIGATOR
Hong Kong Metropolitan University
Locations
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Hong Kong Metropolitan University
Hong Kong, None Selected, China
Countries
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Provided Documents
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Document Type: Study Protocol and Statistical Analysis Plan
Document Type: Informed Consent Form
Other Identifiers
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HE-SF2024/09
Identifier Type: -
Identifier Source: org_study_id
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