Informative Markers of Cardiohemodynamic State in Young Men with Different Types of Autonomic Regulation during Submaximal Bicycle Exercise Test

We performed a comparative study of urgent adaptive changes in hemodynamic and heart rate variability parameters in the process of bicycle exercise test of submaximal power in young men from Magadan oblast with different initial types of autonomic nervous regulation. The subjects (n = 71) were considered healthy based on their health record and allowed to do physical exercises. On the basis of the heart rate variability indices at rest, we determined the initial type of autonomic regulation (normovagotonic or normosympathicotonic) in all subjects (the types differ in their heart rate structures). The subjects underwent a 150-W submaximal bicycle exercise test for 6 min with a pedaling rate of 60 rpm. It was found that the young men of the call-up age with normovagotonic regulation type have more functional reserves and less tension when performing a strenuous exercise. A more than 14- and 7-fold decrease in the total spectral power at the first 2 min of exercise (vs. the baselines) in normovagotonic and normosympathicotonic subjects, respectively, indicates that the former have higher cardiohemodynamic functional reserves and a higher tolerance to exercise.