Learn
The science behind SelfSense — fractal heart-rate variability and DFA alpha analysis, adaptive movement variability, healthy HRV ranges by age, and the role of the vagal nerve in recovery and stress regulation.
Articles in this section
Nervous System Regulation Through Adaptive Movement
A dysregulated nervous system has lost its range, not its strength. Learn how adaptive movement restores HRV, vagal tone, and the fractal complexity that real resilience to stress depends on.
The Benefits of Adaptive Movement Variability
Learn how SelfSense measures adaptive movement variability using DFA alpha on accelerometer and gait data — a real-time marker of bodily adaptability and resilience, driven by fractal dynamics.
Adaptive Variability - How the Body Stays in Conversation Across Scales
Adaptability is not "more vagal tone" or bigger HRV. It is adaptive variability — a structured, multi-scale conversation inside the body and between the body and its environment. Here is what that means in practice.
Breathing for HRV - Which Technique Actually Works (and What the Numbers Miss)
Slow breathing raises HRV amplitude and parasympathetic tone — but it can also simplify the system by imposing one dominant rhythm. A map of the main breathing techniques against what they really do to your nervous system.
Fractal Heart Rate Variability & DFA Alpha Analysis
Learn about fractal HRV dynamics and DFA alpha analysis. Discover why optimal heart rate variability follows fractal patterns and how alpha1 values indicate adaptability and resilience.
HRV Chart by Age - RMSSD vs SDNN Guide
Comprehensive HRV chart by age showing optimal RMSSD and SDNN values for healthy adults. Learn what your heart rate variability means for cardiovascular health and how it changes with age.
How to Actually Improve Vagal Tone
Most advice on how to improve vagal tone optimizes for the wrong thing. Here's what vagal tone really is, what the science of HRV and nervous system regulation actually shows, and how to train it without the woo.