David Bainbridge · Peterborough, England
A six-component framework that replaces the autonomic functions a broken body can no longer perform reliably. This is not a mindset. It is architecture.
Not willpower. Architecture.
What is it
Prosthetic Physiology is a self-developed, six-component framework for managing a severely disrupted autonomic nervous system in the context of ultra-endurance performance.
The body has failed at its most fundamental regulatory tasks — circulatory self-regulation, reflex-driven responses, reliable symptom signalling, GI absorption. Those functions don't return. They are replaced by engineered substitutes.
Cognitive anticipation substitutes for absent reflexes. Continuous cycling motion acts as a circulatory pump. Precision timing governs nutrition, effort, and recovery. Data replaces the symptom signals that never arrive.
The framework is not theory. It is the operational infrastructure behind over 6,000 miles of ultra-endurance cycling — by a rider managing Classical Ehlers-Danlos Syndrome, structural baroreflex failure, complete GI dysmotility, dysautonomia, CRPS, coronary heart disease, and narcolepsy, with no oral medications.
"I do not trust how I feel. I trust the numbers. Somatic signals either don't arrive, or arrive too late. The framework is how I ride anyway."
— David Bainbridge
Core principles
Lost autonomic functions are replaced by engineered systems. Compensation implies the original function still exists. It does not.
Internal somatic signals are treated as unreliable. HRV, heart rate, and trend data provide the primary decision inputs.
For a circulatory system that does not self-regulate, continuous motion is the intervention. Stopping is a haemodynamic gamble.
Without reliable symptom signals, reactive management is too late. All decisions are anticipatory — made before the event they govern.
Heat, cold, compression, and posture are active regulatory tools — not conditions to be tolerated. The external environment is part of the physiological system.
Timing is not a preference. The scheduling of effort, rest, nutrition, and exposure is a structural component of the framework — not a guideline.
The Six Components
Anticipatory decision-making replaces absent autonomic reflexes. Symptom signals either don't arrive or arrive too late to act on. All critical decisions are pre-programmed — before the physiological state that would normally trigger them.
Cycling acts as a circulatory and muscle-pump substitute. A haemodynamic system that does not self-regulate requires an external driver. Motion is the intervention. Stillness carries real haemodynamic risk.
Effort, rest, nutrition, and heat exposure are scheduled within defined physiological windows. Timing is a load-bearing structural component. Deviation from timing isn't inconvenient — it is a failure mode.
GI absorption is unreliable and unpredictable. Fuel is managed as controlled infusion — micro-feeding across narrow timing windows to prevent haemodynamic shocks and circulatory collapse mid-effort. No bolus feeding. No guesswork.
Heat, cold, posture, and compression are active regulatory tools, not conditions to be passively endured. The external environment is integrated into the physiological management system — deployed with the same precision as any other intervention.
HRV, heart rate, and trend patterns replace subjective sensation as primary decision inputs. Internal somatic signals take priority where they exist. Instruments validate and contextualise. Feelings are a secondary source at best.
Live Biometrics
Data is not supplementary to the framework. It is the framework. Without reliable somatic signals, instruments are the primary sensory system for effort management, recovery assessment, and haemodynamic monitoring.
HRV variance of 6–142ms across a single monitoring window is not noise. It is a direct readout of dysautonomic instability — and the primary input to decisions about whether to ride, how hard, and for how long.
Active self-management across five 24-hour blood pressure monitoring cycles reduced time above symptom threshold by 42% without pharmacological intervention. The mechanism was the framework. The evidence is the data.
About
For most of my adult life, I was told what I couldn't do. By doctors, by specialists, by a body with 360,000 lifetime dislocations and a pharmacological profile that should have killed me.
In 2019, I faced a binary choice: stop all the opiates — fentanyl, methadone, morphine, OxyContin — or don't make it to the following year. The detox took 256 days. No shortcuts. Reducing 10% at a time, with continuous withdrawal across eight months. I came out the other side with better pain control than any medication had given me.
In December 2022 I was ending my 19th year as a full-time wheelchair user. In June 2023, I rode the BHF London to Brighton — 54 miles in 4h45m. Three months later: 197 miles over 4.5 days. I clocked 1,800 miles that year. Six thousand since.
The medical system failed me for decades. Cycling didn't. That is not a motivational statement. It is a physiological fact I spent years reverse-engineering.
Ride timeline
Connect
Speaking engagements, Prosthetic Physiology framework collaboration, media enquiries, and Wheels for Tenacious partnerships.