| Autor: |
Kenneth J. Hunt, Jittima Saengsuwan |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
BioMedical Engineering OnLine, Vol 17, Iss 1, Pp 1-12 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
1475-925X |
| DOI: |
10.1186/s12938-018-0561-x |
| Popis: |
Abstract Background Heart rate variability (HRV) arises from the complex interplay of sympathetic and parasympathetic autonomic regulation of heart rate. Ultra-low frequency (ULF) and very-low frequency (VLF) components of HRV play a crucial role in automatic HR controllers, but these frequency bands have hitherto largely been neglected in HRV studies. The aim of this work was to investigate changes in ULF and VLF heart rate variability with respect to exercise intensity and time during treadmill running. Methods RR intervals were determined by ECG in 21 healthy male participants at rest, and during moderate and vigorous-intensity treadmill running; each of these three tests had a duration of 45 min. Time dependence of HRV was investigated for moderate and vigorous running intensities by dividing the constant-speed stages into three consecutive windows of equal duration ($$\sim$$ ∼ 14 min), denoted $$w_1$$ w1 , $$w_2$$ w2 and $$w_3$$ w3 . ULF and VLF power were computed using Lomb-Scargle power spectral density estimates. Results For both the ULF and VLF frequency bands, mean power was significantly different between the resting, moderate and vigorous intensity levels (overall $$p < 0.001$$ p |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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