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

National Taiwan University Hospital14 enrolled

Overview

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.

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 Type

OBSERVATIONAL

Enrollment

Conditions

Accessory Muscle

Interventions

Loaded inspiratory muscle testOTHER

Loaded inspiratory muscle tests will be set at 30% of maximal inspiratory pressure in sitting and supine positions. The orders of the two loaded test conditions will be conducted in random order with at least 20 minute separation. This is an observational study. Subjects will perform only 15 breaths with each loaded test condition to exam the performance of their inspiratory muscles. Loaded inspiratory muscle test is not for training.

Eligibility

Sex: ALLMin age: 20 YearsHealthy volunteers:

Medical Language ↔ Plain English

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 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

Locations (1)

School and Graduate Institute of Physical Therapy of National Taiwan University

Taipei, Zhongzheng Dist, Taiwan

Outcomes

Primary Outcomes

Diaphragm and Sternocleidomastoid muscle activation

Root mean square values during different conditions

Time frame: Through the completion of the loaded inspiratory muscle test condition; it would take about 3 minutes

The mean median frequency of diaphragm and sternocleidomastoid muscle

The power spectrum is divided into two equal areas of the frequency value by median frequency to exam muscle fatigability

Time frame: In one minute after the completion of the loaded inspiratory muscle test condition

Data from ClinicalTrials.gov

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