ON THE CAUSE OF THE RESPIRATORY VARIATION OF THE BALLISTOCARDIOGRAM, WITH A NOTE ON SINUS ARRHYTHMIA

Abstract

Variation in the size of the impacts during the respiratory cycle is a feature of almost every bal- listocardiogram (1). As the subject inhales, the impacts increase in size, to diminish again as he exhales; if the breath is held, this rhythmic varia- tion disappears. The purpose of this investigation