INTRODUCTION: Rehabilitation positively affects the modulation of the autonomic nervous system (ANS). There are no papers evaluating the influence of Nordic walking training (NW) on ANS activity among chronic heart failure (CHF) patients. The aim of study was to assess the influence of NW on ANS activity measured by heart rate variability (HRV) and heart rate turbulence (HRT) in CHF patients and its correlation with physical capacity improvement measured by peak oxygen consumption (peakVO2 (ml/kg/min)) in the cardiopulmonary exercise treadmill test (CPET). MATERIAL AND METHODS: The study group comprised 111 CHF patients (NYHA class II to III; ejection fraction (EF) < 40%). Patients were randomized (2:1) to 8-week NW (five times weekly) at 40 to 70% of maximal heart rate (training group-TG) (n = 77), or to a control group (CG) (n = 34). The effectiveness of NW was assessed by changes (delta) in peakVO2, HRV and HRT as a result of comparing these parameters from the beginning and the end of the programme. RESULTS: Eventually, 36 TG patients and 15 CG patients were eligible for HRV and HRT analysis. In the TG low/high frequency ratio (LF/HF) decreased (1.9 +/- 1.11 versus 1.7 +/- 0.63, p = 0.0001) and peakVO2 increased (16.98 +/- 4.02 versus 19.70 +/- 4.36 ml/kg/min, p < 0.0001). Favourable results in CG were not observed. The differences between TG and CG were significant: delta peakVO2 (p = 0.0081); delta LF/HF (p = 0.0038). An inverse correlation was found between the decrease in delta LF/HF and the increase in delta peakVO2 (R = -0.3830, p = 0.0211) only in the TG. Heart rate variability did not change significantly in either group. CONCLUSIONS: Nordic walking positively affects the parasympathetic-sympathetic balance in CHF patients, which correlates with the improvement in delta peakVO2. No significant influence of NW on HRT was observed.

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