© 2003 Valery Muhin, Pavel Bundzen
St-Petersburg Research Institute of Physical Culture, Russia

The purpose of the research was to investigate an opportunity of use the analysis of heart rate variability as a marker of the psycho-energetic potential of the young skilled athletes.
Methods
The group of 39 young athletes (age 15,7 years; SD = 2,8 years) was investigated. For diagnosis actual psychological status the questionnaire POMS (Profile of Mood States) was used. It allows to determine six parameters of a mental condition: T (tension - anxiety ), D (depression - dejection), A (anger - hostility), V (vigour - activity), F (fatigue), C (confusion). As integrated parameter of a mental status the psycho-energetic index (ratio of the positive and negative factors of a questionnaire POMS) was used (Bundzen P. et al, 2002).
The heart rate monitor (Polar Electro OY) was used for registration the samples of heart rate. This time series of a RR-intervals was exposed to the spectral (Fourier) analysis (Roecker K., Dickhuth H., 2001). The smoothing was made on five points by a Hamming window. The amplitudes of fluctuations of a heart rate with a step in 0,01 Hz were taken into account. This data were used for the correlation analysis with the parameters of the POMS profile. The results of the correlation analysis have shown that the amplitude of fluctuations of a RR-intervals row on frequency 0,01 Hz is more closely connected with mental status of the young sportsmen. The factors POMS T, F, C and PEN are statistical significantly relationship to frequency 0.01 Hz (p<0.01).
In conclusion, the results of the research suggested, that the amplitude of fluctuations of a RR-intervals row on frequency 0,01 Hz may be use as a marker of the psycho-energetic potential of the young skilled athletes.

References
Bundzen P., Korotkov K., Kolody O. et al. Teoria i praktika fizicheskoy kultury, 6, p. 40-44, 2002.
Roecker K., Dickhuth H. 6th Annual congress of the EUROPEAN COLLEG OF SPORT SCIENCE. - Cologne, 2001, p. 52.