| Autor: |
PRINCI, TANJA, GRILL, VITTORIO, K. Cankar, V. Starc |
| Přispěvatelé: |
Institute of Measurement Science, M. Tysler, Princi, Tanja, K., Cankar, V., Starc, Grill, Vittorio |
| Jazyk: |
angličtina |
| Rok vydání: |
2014 |
| Předmět: |
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| Popis: |
Keywords: Caffeine; heart rate variability; healthy volunteers. Introduction. The caffeine is one of the most widely used pharmacologically active substances. It has many different physiological effects on the cardiovascular function. Also the cardiac autonomic control could be altered by caffeine consumption. However, findings regarding the effect of caffeine consumption on cardiac autonomic nervous system (ANS) activity are controversial. The aim of the present study was to assess the effects of caffeine on cardiac ANS in young healthy subjects. Methods and Materials. In sixteen healthy volunteers (7 women), age 24-35, the electrocardiogram (ECG) was recorded continuously at rest before as well as 30 min and 60 min after caffeine ingestion (200 mg of caffeine in 50 ml of water). Before each the beginning of ECG registration the arterial blood pressure was measured. As assessment of cardiac ANS activity the power spectral analysis (autoregressive spectra) and the Poincaré plot analysis of the heart rate variability (HRV) were used. Autoregressive spectra were evaluated on intervals of 512 points. The powers of low (LF: 0.04-0.15 Hz) and high (HF: 0.15–0.40 Hz) spectral bands were determined. In Poincaré plot analysis SD1 and SD2 indexes were used as marker of vagal and sympathetic activities, respectively. Results. The heart rate did not change significantly after caffeine ingestion. The Poincaré plot SD1 index significantly increased (p |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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