Heart Rate Variability and the Assessment of Elite Endurance Athlete

Measures of heart rate variability(HRV)are often considered a convenient non-invasive assessment tool for monitoring fatigue and fitness,which was direct implication for adjusting individual adaptation to training.However,much of the research in changes of HRV has involved recreational and amateur athletes,with few studies conducted in elite athletes.Additionally,it is important to be focus on the inaccuracy of the acquisition of HRV data and the selection of index.The natural logarithm of the square root of the mean sum of the squared differences between R-R intervals(Ln rMSSD)was preferred to assess the performance and the fatigue in elite athletes,which showing how these indices can be practically applied to explain the basic figures of the individual one.