Effect of physical conditioning on cardiovascular function: A ballistocardiographic study∗

Abstract Fifteen middle-aged men participated in a program of endurance exercise and running for six months. Changes in cardiovascular function were evaluated by using an air-supported ultralow-frequency ballistocardiograph. Significant increases occurred in mean I, J, GI, HI and IJ forces. Four of the 5 men with initially abnormal ballistocardiograms had normal records at the end of the program.