Explanatory Articles: pain, sitting, and the body’s adaptability
Educational articles organized in three topics, each with its reading time and level.
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How living systems maintain their adaptability — and how losing it can contribute to pain and disability.
Adaptability and Adaptive Potential: A Law of Living Systems
Distinguishing adaptation, plasticity and adaptive potential, then linking this framework to the seated human body and the SBNFA™ framework.
Continuous Postural Regulation: The Cone of Balance as a Dynamic Model
Postural regulation as a continuous loop of perception, integration and action, from the cone of economy to the dynamic cone of balance.
Natural Postures: Preserving Adaptive Potential
No posture is ideal in itself: what matters is preserving the variability of positions and supports and the body’s ability to adapt.
Spinal Profiles and Seated Posture
There is no universal sitting posture: each spinal profile has its own natural balance, which the seat should respect rather than correct.
Tissue Adaptability: An Overlooked Biological Factor in Back Pain
The overlooked role of living tissues in tolerating repeated loads, and its link with back pain.
Fascia and Tensegrity Explained
The role of fascia in regulating mechanical stress, tissue gliding and pain.
Back Pain and Biotensegrity
How biotensegrity helps explain the spine as an adaptive system rather than a stack of vertebrae.
Chronic Pain Explained — Part 1
How the nervous system can become hypersensitive and sustain real pain without an active lesion.
Chronic Pain Explained — Part 2
When pain becomes autonomous and is maintained through neurosensory learning.
Back Pain With a Normal MRI
Why real pain can persist despite reassuring imaging.
Why Your Body Is “Crystallizing”
Fascial fibrosis, tissue stiffness and their role in persistent pain.
Why Micro-Movement Matters More Than Moving a Lot
Continuous micro-adjustments are essential for the seated body.
Proprioception: Our Sixth Sense
The role of body perception in balance, movement and postural adaptation.
Compensation, Pain and Dynamic Balance
How the body’s compensations can sustain pain, imbalance and inflammation.
Situations where the loss of adaptability becomes visible, painful or functionally limiting.
Coccygodynia: Why Does Sitting Hurt So Much?
Why the tailbone can become painful when sitting, and why direct pressure does not explain everything.
Pudendal Neuralgia and Sitting
Why simply sitting can become an ordeal with pudendal neuralgia.
Endometriosis Pain When Sitting
Nerve compression, pelvic congestion, adhesions and loss of tissue mobility in endometriosis.
Back Pain While Sitting
The link between postural disorder, immobility, loss of tissue gliding and pain when sitting.
Fibromyalgia and Sitting
Why sitting can worsen widespread pain, and how it could become a support for adaptation.
Musculoskeletal Disorders and Pain From Sitting
Pelvic immobility and chair constraints can contribute to musculoskeletal disorders.
Prolonged Sitting: Health Risks
The effects of prolonged sitting on musculoskeletal disorders, metabolic health and sedentary-related risks.
How to design a seat that supports adaptation rather than constraining it.
Spinal Profiles and Seated Posture
Why one seat does not suit everyone: natural spinal profiles and Aporia®’s principles of adaptation.
Aporia®: The Bioactive Rehabilitation Seat
How Aporia® restores a dynamic rather than a fixed posture.
Acting on Fascia With Aporia®
The bioactive seat restores load variability and tissue gliding.
From 2D to 3D Ergonomics
“Sitting up straight” is no longer enough: moving from fixed ergonomics to adaptive ergonomics.
Aporia®: Relieve Sitting Pain, Whatever Its Origin
How Aporia® bioactive seating restores pelvic mobility and natural postural balance.
Dynamic Chairs: The 2026 SBNFA™ Comparison
Six seating architectures compared across 7 body functions and 19 variables of the SBNFA™ framework.
Nantes University Hospital “Pelvi-Seat” Study
Summary of the evaluation of Aporia® ergonomic cushions conducted in a hospital setting.
Movement Practices & Adaptive Cultures — in preparation:
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These articles are published by Blue Portance. Several of them draw on the SBNFA™ framework, whose foundations are developed in the Expert Guides.
Note: these articles are intended to inform and to explain mechanisms. They do not constitute a medical diagnosis or a prescription, and they do not replace the advice of a healthcare professional.
Blue Portance Knowledge Base · Non-commercial reproduction permitted with source attribution. © Gil Ayache. The concepts, biomechanical models, diagrams, terminology, and principles presented on this page are works protected by copyright. They are made available to Blue Portance under an intellectual property license agreement, without transfer of economic rights or of authorship.
