Background: Wrist-worn heart rate monitors have not been extensively validated for heart rate variability analysis. The purpose of this study was to compare time-domain variability of heart interval series (R-Ri) recorded by the Polar S810 monitor (Polar Electro Oy, Kempele, Finland) 02). The SDNN, CV, and pNN50 indices did not show differences (P = 0.12 to 0.73). Conclusions: The Polar S810 monitor was feasible and reliable for recording short-term R-R interval series, showing excellent agreement with the ECG in providing the time-domain indexes of heart inter-val variability with differences functionally not relevant. The CV showed the higher agreement in both postures, and the SDNN and pNN50 in the standing posture. (PACE 2009; 32:43-51) wrist-worn heart rate monitor, Polar monitor, exercise practice, heart rate variability, cardiac autonomic function Introduction Time-and frequency-domain variability analysis of spontaneous short-or long-term heart interval series is a recently introduced tool widely employed for simple, noninvasive, and sensitive evaluation of cardiac autonomic modulation in different functional and clinical conditions.

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Quantifying the morphological changes in eosinophils is a feasible, easy, and reliable manner to identify the severity of an asthma exacerbation and therefore might improve the clinical management of asthmatic children.

The cognitive status and the cardiac sympathovagal modulation appear to be correlated and hypothetically may influence one another in mild to severe Alzheimer's disease. Individuals with more severe cognitive deficiency showed suggestive lower cardiac parasympathetic modulation and trend for higher cardiac sympathetic modulation.