Observations on the systolic I-J stroke acceleration-force values of 49 male subjects from a roller ball-bearing ballistocardiographic bed

Abstract

1. 1. The systolic I-J stroke acceleration-force values from a ball-bearing ballistic platform have been determined for 49 normal males. 2. 2. The wide range and overlap of expiratory and inspiratory acceleration-force values preclude the establishment of a too rigid range of quantitative values, and indicate the need for qualitative (Grade I–IV) evaluation of the ballistocardiogram. 3. 3. The force value obtained with the ball-bearing system is nearly equal to the result from the Starr high-frequency system, but is only 82 per cent of the force value from a differential pendulum.