1. Circadian pattern of heart rate variability in chronic heart failure patients. Effects of physical training;Adamopoulos;Eurheart J,1995
2. Hemodynamic regulation: investigation by spectral analysis;Akselrod;Am J Physiol,1985
3. Power spectrum analysis of heart rate fluctuations: a quantitative probe of beat-to-beat cardiovascular control;Akselrod;Science,1981
4. Changes in R-R variability before and after endurance training measured by power spectral analysis and by the effect of isometric muscle contraction;Al Ani;Eur J Appl Physiol,1996
5. Position statement on the recommended quality and quantity of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults;American College of Sports Medicine;Med Sci Sports Exerc,1998