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- W2021199679 abstract "The aim of this study was to investigate correlation between heart rate variability (HRV) measured with the frequency domain method and the deflection (k value) of the heart rate performance curve (HRPC). The HRV of 18 cycle trained (VO2max = 61.0 ± 4.6 ml.kg−1.min−1) male subjects was measured at rest and during incremental cycle ergometry. The initial work load was 0.6 W.kg−1 and was increased 0.6 W.kg−1 every 3 min until exhaustion. HRV was taken from consecutive 256 beats. Three frequency bands were calculated using the fast Fourier transformation (FFT): very low frequency (VLF) (0.00392–0.04 Hz), low frequency (LF) (0.04–0.15 Hz) and high frequency (HF) (0.15–0.4 Hz). In addition, the measured total power (TP) (0.00392–0.4 Hz), LF/HF, VLF/TP, LF/TP and HF/TP were calculated. The mean k value was 0.19 ± 0.26. HRV at rest was dominated by the HF-band (VLF = 737 ± 335; LF = 1257 ± 482; HF = 1833 ± 962; TP = 3826 ± 1514). The k value showed a significant negative correlation with LF (p < 0.05; r = −0.51) at rest. The power of each single frequency band diminished by 49.9% of maximal performance (Pmax). The k value correlated negatively with HF (p < 0.05; r = −0.63) and HF/TP (p < 0.01; r = −0,77) and positively with VLF/TP (p < 0.05; r = 0.65) at 37.4% of Pmax. The results suggest that low levels of LF-power at rest and strong decrease in HF-power in the beginning of the exercise are associated with a positive k value. High levels of LF-power at rest and small decrease in HF-power in the beginning of the exercise resulted in a negative k value." @default.
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- W2021199679 date "2001-05-01" @default.
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- W2021199679 title "CORRELATION BETWEEN HEART RATE VARIABILITY AND THE BEHAVIOR OF THE HEART RATE PERFORMANCE CURVE" @default.
- W2021199679 doi "https://doi.org/10.1097/00005768-200105001-00389" @default.
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