DOES THE VESICULAR LUNG SOUND COME ONLY FROM THE LUNGS

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Abstract
Considerable confusion exists regarding the frequency spectrum of the normal lung sound, especially the components in the lower frequency range. Frequencies of peak intensity varying from 10-200 Hz have been reported by different laboratories. A component of musculoskeletal sound could contribute to the inspiratory lung sound, but this has never been assessed. To separate the sound made by the lung from that of muscular contraction, frequency analysis of the sounds occurring during inspiration and preinspiration and postinspiration open-glottis breath-holds was done in 4 normal [human] subjects. At frequencies below 200 Hz, the musculoskeletal component increased as the lung sound component decreased. At 50 Hz and blow, the sounds of inspiration and postinspiratory breath-holding were almost indistinguishable. Musculoskeletal noise seriously contaminates what is usually considered to be lung sound.

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