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Comparison of two systems for long-term heart rate variability monitoring in free-living conditions - a pilot study

DOI: 10.1186/1475-925x-10-27

Keywords: Autonomic nervous system, field study, Holter monitoring, method comparison

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Abstract:

Full-day ambulatory electrocardiography (ECG) signals were recorded from 8 females simultaneously using Actiheart and Holter recorders, and signals were processed to RR-interval time series. Segments of 5-minute duration were sampled every 30 minutes, and spectral components of the heart rate variability were calculated. Actiheart and Holter values were compared using Deming regression analysis and Bland-Altman plots.In total, 489 segments were available with an HRV value from both Actiheart and Holter recordings after filtering out segments with >10% interpolated beats. No systematic differences between Actiheart and Holter HRV were found. The random deviations between Actiheart and Holter were comparable to the repeatability standard deviation between consecutive Holter measurements.The results show that Actiheart is suited as a stand-alone ambulatory method for heart rate variability monitoring during occupational and leisure-time activities.Cardiovascular disease (CVD) is by far the leading cause of morbidity and mortality in Western societies [1]. Factors in the working environment are considered to enhance the risk of CVD [2-4]. This association is generally explained by elevated stress responses, including increased sympathetic dominance of the cardiac autonomic nervous system from a poor work environment [5,6], which in the long run enhances the risk of CVD [3].Heart rate variability (HRV) is a well-recognized method for assessing activity of the cardiac autonomic nervous system [7,8]. HRV has been shown to be a strong predictor for mortality after acute myocardial infarction [9,10] and CVD in healthy subjects [11-13]. Therefore, HRV is regarded to be a useful non-invasive predictor for CVD.HRV is increasingly being used for measuring the activity of the cardiac autonomic nervous system in relation to work [14]. Although HRV is influenced by physical activity [15,16], studies using ambulatory HRV monitoring during work have not controlled for physical activi

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