Correlation of vegatative tone indicator with Kerdo index and heart rate variability

O. I. Androshchuk, V. A. Zavhorodnia


Introduction. Vegetative tone is traditionally evaluated with Kerdo index (KI). Recently, the method of determining the tone correlation of various parts of the autonomic nervous system with the indicators of heart rate variability (HRV) has been widely used. However, there are no comparative studies of these approaches.

Purpose. The purpose of the study was to investigate the links of Kerdo index with HRV indicators among athletes and non-sportsmen.

Methods. The measurements were carried out on 27 powerlifters (group I), 28 athletes of endurance events (group II) and 60 non-sportsmen (group III) at the age of 18-24 in conditions close to the basic circulation. The blood pressure and the registration of chest rheogram signals were measured in prone position at rest and tilt test for 5 minutes. The KI was evaluated based on HRV. The correlation analysis was conducted determining non-parametric Spearman coefficient.

Results. In prone position at rest in all groups, vagotonia was found and was expressed most in sportsmen training endurance. The athletes with strength training focus had higher level of the links of Kerdo index and HRV indicators. At tilt test, the correlation of HRV and KI increased in group II sportsmen at rest, remained high in group I sportsmen and increased slightly in non-sportsmen.   

Conclusion. In the groups of sportsmen,the most stableand high links were found between Kerdo index and rMSSD and pNN50, which might be recommended for evaluating vegetative tone in training process.  


heart rate variability; vegetative tone


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