Accessory Muscle
Conditions
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.
Interventions
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.
Sponsors
National Taiwan University Hospital
Study design
Observational model
OTHER
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
20 Years to No maximum
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 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 |
Countries
Taiwan
Outcome results
None listed