Respiratory Sounds recorded by Radio‐Stethoscope from Normal Horses at exercise

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Abstract
A graphic representation is presented of respiratory sounds recorded by a radio-stethoscope from normal horses exercised at the walk, trot, canter and gallop. Methods whereby inspiratory and expiratory sounds were distinguished are discussed. The form of amplitude envolopes of the sounds recorded at different gaits are compared. Certain measurements of relative amplitudes and the form of amplitude envelopes of the recorded respiratory sounds can be recognized as typical of normal horses when exercised at the canter and gallop. The influence of some physiological events (e.g., deglutition on the rhythm of normal respiration at the canter and gallop) is indicated.

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