HRV Frequency Spectrum

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HRV frequency spectrum · 5 min supine

R. Okafor · 34 y · 18 Feb 2026 · 5 min supine · Welch · 256 s Hann windows · 50% overlap

129 bins · 0–0.5 Hz · banded total 3,459 ms² · LF:HF 1.48

Share shown as

VLF: 0.003–0.04 Hz; 912 ms²; 26.4%
LF: 0.04–0.15 Hz; 1,520 ms²; 43.9%
HF: 0.15–0.4 Hz; 1,027 ms²; 29.7%

LF:HF 1.48 · 1,520 ms² ÷ 1,027 ms²

Normalised units are each band as a share of 2,547 ms² — the banded total minus VLF, which is why VLF has no n.u. of its own. Both readings divide by the same number, so the LF:HF ratio is identical either way.

63 ms² of the estimate (1.8% of everything sampled) lies outside the declared bands — the trend below the lowest edge and whatever sits above the highest. It is drawn as a bare line and is in no share above.

The y axis is a density — ms²/Hz — so a band’s power is the area under the curve between its two edges, integrated by the trapezoid rule over the bins that were estimated. Shares are of the banded total, not of the whole estimate. Point at the spectrum, or tab in and use the arrow keys, to read any bin.

HRV frequency spectrum · 5 min supine — one row per frequency band, integrated from 129 density bins between 0 and 0.5 Hz. LF:HF is 1.48.
Band	Range	Power	Share of total	Normalised units	Peak	Bins
VLF	0.003–0.04 Hz	912 ms²	26.4%	not applicable	37,502 ms²/Hz at 0.008 Hz	10
LF	0.04–0.15 Hz	1,520 ms²	43.9%	59.7 n.u.	20,706 ms²/Hz at 0.105 Hz	28
HF	0.15–0.4 Hz	1,027 ms²	29.7%	40.3 n.u.	10,598 ms²/Hz at 0.266 Hz	64

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HRV frequency spectrum · 5 min supine

R. Okafor · 34 y · 18 Feb 2026 · 5 min supine · Welch · 256 s Hann windows · 50% overlap

Power spectral density against frequency, integrated into the standard HRV bands

No spectrum to integrate yet

A band power is the area under a density estimate, so this card needs the estimate itself — at least two bins of ms²/Hz against frequency. Three band totals cannot be unrolled back into the shape they came from.

HRV frequency spectrum · 5 min supine

R. Okafor · 34 y · 18 Feb 2026 · 5 min supine · Welch · 256 s Hann windows · 50% overlap

Power spectral density against frequency, integrated into the standard HRV bands

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HRV frequency spectrum · 5 min supine

R. Okafor · 34 y · 18 Feb 2026 · 5 min supine · Welch · 256 s Hann windows · 50% overlap

Power spectral density against frequency, integrated into the standard HRV bands

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