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Reduction in inspiratory activity in response to sternal vibration
Respiration Physiology
|May 1, 1977
Summary
Longitudinal sternal vibration at 100 Hz reduces tidal volume (VT) and prolongs inspiratory time (ti) by slowing inspiration rate, not altering normal termination mechanisms. Chest wall sensory nerves inhibited inspiration.
Area of Science:
- Respiratory Physiology
- Neuroscience
- Biomechanics
Background:
- Previous research indicated reduced tidal volume with 100 Hz sternal vibration.
- The precise mechanism by which vibration affects respiratory parameters remained unclear.
Purpose of the Study:
- To investigate the effect of longitudinal sternal vibration on respiratory control.
- To elucidate the mechanism by which vibration influences tidal volume and inspiratory timing.
Main Methods:
- Subjects received 100 Hz longitudinal sternal vibration during breathing.
- Measurements included tidal volume (VT), inspiratory time (ti), and intrapleural pressure.
- Electrophysiological recordings of phrenic motoneurones were obtained.
Main Results:
- Vibration reduced tidal volume (VT) and prolonged inspiratory time (ti), maintaining a consistent VT:ti curve.
- The rate of inspiration, indicated by the fall in intrapleural pressure, was reduced.
- Instantaneous ventilation decreased at all levels of chemical drive.
- Phrenic motoneurone recordings supported these findings.
Conclusions:
- Chest wall sensory nerves, activated by vibration, can inhibit inspiration.
- Vibration affects inspiration by reducing its rate, not by interfering with the mechanisms that terminate inspiration.