Activation Patterns of Respiratory Muscles to Loaded Inspiratory Muscle Tests in Healthy Adults Under Different Posture

Completed

• Conditions: Accessory Muscle
• Interventions: Other: Loaded inspiratory muscle test

• Registration Number: NCT03729986
• Lead Sponsor: National Taiwan University Hospital

Brief Summary

Whether minimizing sternocleidomastoid (SCM) activation in supine position would increase diaphragm activation during loaded inspiratory muscle tests remains to be determined. Therefore, the purpose is to exam diaphragm and SCM activation during loaded inspiratory muscle tests in sitting and supine position in healthy adults.

Detailed Description

Inspiratory muscle training usually performed in the upright sitting position. In healthy individuals, sternocleidomastoid (SCM) is rarely recruited during tidal breathing, but previous studies have demonstrated SCM activation during loaded inspiratory muscle tests in upright sitting position. Whether minimizing SCM activation in supine position would increase diaphragm activation during loaded inspiratory muscle tests remains to be determined. Therefore, the purpose is to exam diaphragm and SCM activation during loaded inspiratory muscle tests in sitting and supine position in healthy adults.

Study Timeline

• Status Verified: 2018-11
• Study Start: 2018-11-01
• Study First Submitted: 2018-11-01
• Study First Submitted QC: 2018-11-01
• Study First Posted: 2018-11-05
• Primary Completion: 2018-12-28
• Study Completion: 2018-12-28
• Last Update Submitted: 2019-02-10
• Last Update Posted: 2019-02-12

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 14

Inclusion Criteria

• age > 20 years old
• without exercise habit (any exercise that less than 3 days/week)
• can cooperate with the measurements of this study

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Exclusion Criteria

• any clinical diagnosis that will influence the measurement, including any history of neuromyopathy
• angina, acute myocardial infarction in the previous one month
• pregnancy
• participated in inspiratory muscle training program in the previous three months
• any psychiatric or cognitive disorders, for example: Mini-Mental State Examination (MMSE) < 24, that will disturb the communication and cooperation of the study

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Healthy adults	Loaded inspiratory muscle test	Healthy subjects without exercise habit that can cooperate with the measurements of this study, loaded inspiratory muscle test.

Primary Outcome Measures

Name	Time	Method
Diaphragm and Sternocleidomastoid muscle activation	Through the completion of the loaded inspiratory muscle test condition; it would take about 3 minutes	Root mean square values during different conditions
The mean median frequency of diaphragm and sternocleidomastoid muscle	In one minute after the completion of the loaded inspiratory muscle test condition	The power spectrum is divided into two equal areas of the frequency value by median frequency to exam muscle fatigability

Trial Locations

Locations (1)

School and Graduate Institute of Physical Therapy of National Taiwan University; 🇨🇳 Taipei, Zhongzheng Dist, Taiwan