Glossary
Glossary
Definitions of the terms Lumo works with day to day — each technical term followed by a plain-spoken explanation anyone can follow.
- HRV心拍変動 / Heart Rate Variability
The variation in time between consecutive heartbeats. A healthy heart is not metronomic — it fluctuates with breathing, posture, and stress. Lumo reads regulation from this fluctuation.
- R-R 間隔R-R interval
The time between two consecutive R-peaks of the heartbeat. The raw input from which HRV (and Lumo Regulation Score) is computed; derivable from Apple Watch, Polar, and similar wearables.
- SDNNStandard Deviation of NN intervals
Standard deviation of all R-R intervals over a measurement window. A summary metric of total HRV magnitude, reflecting overall autonomic activity.
- RMSSDRoot Mean Square of Successive Differences
Root mean square of differences between successive R-R intervals. A short-term variability index commonly used as a marker of parasympathetic (rest-and-recover) activity.
- LF / HFLow Frequency / High Frequency band ratio
The ratio of low- to high-frequency power in HRV spectral analysis. Often used as a balance indicator between sympathetic and parasympathetic activity (interpretation is context-dependent).
- DFA-α1Detrended Fluctuation Analysis (short-term scaling exponent)
A nonlinear measure capturing the self-similar (fractal) structure of HRV over short scales. Represents the "quality" of regulation — how rhythmically organized the body is.
- 自律神経Autonomic Nervous System (ANS)
The part of the nervous system controlling functions outside conscious thought — heart rate, breathing, digestion. Comprises sympathetic (activation) and parasympathetic (recovery) branches; their balance is what we observe as 'regulation.'
- 調律 / RegulationAutonomic regulation
The capacity of the autonomic nervous system to switch appropriately and bring the body into balance. The core concept of Lumo — we measure regulation, not emotion.
- Lumo Regulation Score0–100 の自律神経調律度
A 0–100 score built mainly on SDNN and HF_norm (normalized high-frequency power). Lower values indicate dysregulation; higher values indicate attunement. The central metric of Feelmo.
- こころの調律度Consumer name for the Regulation Score
Feelmo's consumer-facing name for the same Regulation Score, translated into gentle, observational language: 'settled' vs. 'fluctuating.'