The effect of regular physical training on heart rate variability in healthy male volunteers

Abstract Funding Acknowledgements Type of funding sources: None. Background The autonomic nervous system's responses are reflected in heart rate variability (HRV). They have a significant role accompanying the training process, however, assessment long-term daily HRV indices dynamics is not widely used sports cardiology. Purpose To determine if there variations regulation cardiac activity to regular systematic training. Methods In this prospective study, we included 28 healthy men aged 18-19 years who had repeated 24-hour Ambulatory ECG monitoring between February 2018 and December 2019 (Figure 1). subjects were similar working living conditions. regimen consisted moderate vigorous physical for 270 (SD 40) minutes per week (total 100 weeks follow-up). divided into groups according median changes results various types (Table 1): with maximum minimum positive fitness endurance (3000m race), speed (100m strength (pull-ups on horizontal bar). Holter was performed using wearable device. parameters at beginning end study compared. assess HRV, following time-domain used: RMSSD (root mean square successive RR interval differences), pNN50% (percentage intervals that differ by more than 50 ms) SDANN (standard deviation averages NN all 5 min segments entire recording). Results initial 1-6 did significantly across group 1, improvement exercise performance directly correlated (rs = 0.297, p <0.05) 0.448, <0.05). 3, increased short distance running accompanied decrease values –0.211, –0.539, an increase 0.352, < 0.05). 5, exercises balanced 0.371, <0.05), 0.347, as well 0.440, <0,05). 2, 4, 6, but weaker associations. Conclusion Systematic associated rate. An sprint parasympathetic sympathetic heart. Increased both activity. While limb system.