Preliminary study of a physical fitness index non-invasively obtained by impedance cardiography.

Abstract

Lactate Threshold (LT) is defined as an inflection point of blood lactate concentration (BLC) during physical exercise and widely used as an index of physical fitness. However, it requires cumbersome blood sampling. To solve this problem, we have been trying to develop a new non-invasive fitness index. In the previous study, we used an impedance cardiograph for non-invasively monitor heart rate (HR), stroke volume (SV) and cardiac output (CO) during incremental ergometer exercise together with BLC responses (27 male and 19 female subjects). As a result, in the male subjects, the load values at the inflection points of CO responses were coincide well with those of LT. However, it was not so clear in female subjects. In this study, therefore, we reduced the load increment in female by half (previous: 20W, present: 10W), and then, expected data were obtained. Details of the experimental data will be presented in the conference.