Cardio Respiratory Fitness (CRF) reflects metabolism and as the name indicates lungs and heart interact by supply of oxygen to tissues and organs and by elimination of carbon dioxide. Maximal oxygen capacity of a person means the maximal oxygen consumption determined until exhaustion and is called VO₂-max. It’s commonly used to test the aerobic endurance or cardiovascular fitness of athletes before and at the end of a training cycle. VO₂-max is measured in milliliters of oxygen consumed in one minute, per kilogram of body weight (mL/kg/min).
While sports-enthusiasts and athletes are often very interested in knowing their VO₂-max level, CRF is also a valuable metric for assessment of overall health.

CRF is a combined measure of how well the lungs are able to transport oxygen into the blood, the hearts ability to pump the oxygenated blood around in the body, and how well the muscles can utilize the oxygen.

CRF is normally measured using a ergometer cycling or treadmill running test, pushing the test subject to exhaustion, while breathing through a mask for analysis of the in- and expiratory gas.

The VentriJect Seismofit® system eliminates this inconvenience. With our system, the subject does not need to perform any exercise. The Seismofit® sensor is adhered to the chest and the recording of the signal only takes 45 seconds. The signal is then analyzed by our algorithm and the result is returned and presented to the user. The whole session takes about 4-5 minutes.