Dr. London Heart Engine Optimisation Protocol

Q: What is the Dr. London Heart Engine Optimisation Protocol?

It's a clinical framework from cardiac surgeon Dr. Jeremy London for assessing and reversing age-related heart function decline. It uses ejection fraction as a 'report card' for heart health, categorises decline into five root causes, and prescribes the Lavine aerobic exercise protocol — shown to reverse cardiac aging by nearly 20 years in sedentary midlife adults.

Q: What is ejection fraction and why does it matter?

Ejection fraction (EF) is the percentage of blood your left ventricle pumps out with each heartbeat. Normal is 50–70%; 40% or less indicates heart failure or significantly reduced function. Dr. London calls it a 'report card and crystal ball' — it's the single most important determinant of cardiac outcomes and predicts future mortality risk before symptoms ever appear.

Q: How do I know if I have a sedentary lifestyle clinically?

Clinically, per the Lavine study, a sedentary lifestyle means exercising two times or less per week over a two-year period. Dr. London identifies this as the single most common and most important lifestyle factor driving ejection fraction decline. If you meet this definition, it becomes your primary intervention target regardless of other risk factors.

Q: How do I reverse cardiac aging with exercise?

Follow the Lavine Protocol: 4–5 aerobic sessions per week, with 1 very high-intensity session and 1–2 cross-training or active-recovery days. Start with a slow, gradual ramp-up rather than full volume, and sustain it long-term. In the 2018 study, 80%+ adherence over two years improved VO2 max by up to 18% and reversed cardiac age by nearly 20 years.

Q: How does this protocol compare to just doing yoga or general fitness?

This protocol prioritises structured aerobic training, while yoga alone doesn't produce the same results. In the Lavine study, the yoga/stretching control group showed no significant improvement in ventricular elasticity or VO2 max. General fitness helps, but reversing cardiac aging specifically requires the aerobic dose, high-intensity component, and sustained adherence this framework prescribes.

Q: When should I get an echocardiogram?

Get one if you're in midlife, sedentary, have risk factors like hypertension or diabetes, or have symptoms like shortness of breath or reduced exercise tolerance. Because EF decline often occurs without symptoms, an echocardiogram is the critical first step — it non-invasively measures your ejection fraction and evaluates all four heart valves before problems become advanced.

Q: What results can I expect from following this protocol?

With sustained adherence — 80%+ over two years in the Lavine study — you can expect up to an 18% improvement in VO2 max and ventricular elasticity comparable to a heart nearly 20 years younger. Results are tracked via repeat echocardiogram and VO2 max testing. Consistency over time is the mechanism; short bursts don't reverse cardiac aging.

Q: What are the five root causes of low ejection fraction?

The five categories are: direct muscle damage (heart attack, myocarditis, chemotherapy), pressure overload (high blood pressure, aortic stenosis), volume overload (leaking valves), rhythm disturbances (atrial fibrillation), and lifestyle factors (sedentary behaviour, poor metabolic health, chronic alcohol). Identifying the correct category — or categories, since multiple can apply — drives the correct intervention strategy.

Q: Can cardiac aging really be reversed or is it inevitable?

Ventricular stiffening with age is inevitable, but decline in function is not. Dr. Ben Lavine's 2018 study directly showed that structured aerobic exercise in sedentary 50–55-year-olds reversed cardiac age by nearly 20 years. The belief that nothing can be done is a critical error — early identification and sustained lifestyle intervention offer the greatest chance of reversal.

Q: Should I take medication or change my lifestyle first?

Lifestyle modifications are the foundation, and medications are the next layer — not the first line. Dr. London's implied sequencing is to institute lifestyle changes first, then layer medications if needed. Exceptions exist for arterial blockages, valve abnormalities, or rhythm issues that may require parallel medical intervention alongside — not instead of — lifestyle changes.

Last updated: 16 July 2026

Apply Dr. Jeremy London's clinical framework to assess, understand, and actively reverse age-related decline in heart function through targeted lifestyle intervention.

// TL;DR

The Dr. London Heart Engine Optimisation Protocol is a clinical framework for assessing and actively reversing age-related decline in heart function through targeted lifestyle intervention. Based on cardiac surgeon Dr. Jeremy London's teaching and Dr. Ben Lavine's 2018 study, it uses ejection fraction (EF) as a 'report card' for heart health, categorises any decline into five root causes, and prescribes a structured aerobic exercise program shown to reverse cardiac aging by nearly 20 years. Use it if you're in midlife, sedentary, or have received a concerning echocardiogram result and want to understand and improve your cardiovascular longevity.

Framework

// When should you use the Heart Engine Optimisation Protocol?

Use this skill when a user wants to evaluate their cardiovascular health status, understand what their ejection fraction means, identify the root cause category of any heart function decline, or design a lifestyle program to reverse cardiac aging — particularly if they are in midlife, sedentary, or have received a concerning echocardiogram result.

// What information do you need before starting the protocol?

Current activity levelrequired
How many times per week the user exercises and what type — used to assess sedentary lifestyle baseline
Known ejection fraction (EF) if available
Percentage from a recent echocardiogram, if the user has had one
Relevant diagnoses or symptoms
Any known conditions such as high blood pressure, atrial fibrillation, valve issues, diabetes, or symptoms like shortness of breath, fluid retention, or reduced exercise tolerance
Age and general health contextrequired
User's age and whether they consider themselves otherwise healthy — critical for contextualising EF norms and intervention urgency
Cardiac history
Any prior heart attacks, infections, chemotherapy, or cardiac procedures

// What are the core principles behind Dr. London's heart framework?

Ejection Fraction as Report Card

The ejection fraction (EF) is the single most important determinant of how well your heart is functioning and your outcomes with any cardiac procedure. Treat it as a report card — and a crystal ball — for future health and longevity, not just a clinical number.

The Closed Loop Pump Model

The heart is a simple closed loop pump. The right side fills and sends blood to the lungs; the left side receives oxygenated blood and ejects it to the body. Every inefficiency in this loop — stiffness, blockage, leakage, or rhythm disruption — reduces the cardiac output fuelling every organ.

Stiffening Is Inevitable, Decline Is Not

Cardiac aging — the progressive stiffening and loss of elasticity in both ventricles — occurs decade to decade even without a heart attack. But Dr. Lavine's data shows this trajectory can be reversed through structured aerobic exercise, sometimes by nearly 20 years of cardiac age.

Treat Your Heart Like an Engine

Fuel it properly with a whole foods diet. Keep it running properly with solid lifestyle choices. Take it out for a drive often. The more consistently you do this, the more miles — and better quality miles — you will get.

Five Root Cause Categories of EF Decline

Low ejection fraction has five distinct root cause categories: direct muscle damage (e.g. heart attack, myocarditis, chemotherapy), pressure overload (e.g. high blood pressure, aortic stenosis), volume overload (e.g. leaking valves), rhythm disturbances (e.g. atrial fibrillation), and lifestyle factors (e.g. sedentary behaviour, poor metabolic health, chronic alcohol). Identifying the correct category drives the correct intervention.

Identify Early, Intervene Early

EF decline can happen without symptoms — it sneaks up on you. The key is to identify stiffening and reduced function early via echocardiogram so that lifestyle and medical interventions have the greatest chance of success.

// How do you apply the Heart Engine Optimisation Protocol step by step?

1
Establish the baseline: Know your ejection fraction
The starting point is always an echocardiogram — a non-invasive ultrasound that images both ventricles and all four valves. Normal EF is 50–70%. An EF of approximately 40% or less indicates heart failure or significantly reduced heart function. If the user does not have a recent echo, flag this as the immediate first action before anything else. Supplement with a BNP blood test (general indicator of heart failure status) and an EKG (heart rhythm evaluation) where clinically appropriate.
2
Categorise the root cause of any EF concern
Map the user's situation to one or more of the five root cause categories: (1) Direct muscle damage — heart attack history, viral myocarditis, autoimmune disease, or chemotherapy agents; (2) Pressure overload — chronic high blood pressure or aortic stenosis creating resistance the left ventricle thickens to compensate for; (3) Volume overload — leaking heart valve causing the heart to distend and contraction to become inefficient; (4) Rhythm disturbances — atrial fibrillation or other discoordinated rhythms reducing pumping efficiency; (5) Lifestyle factors — sedentary lifestyle, poor metabolic health, diabetes, metabolic syndrome, chronic alcohol use. If multiple categories apply, note all of them.
3
Assess sedentary lifestyle status
A sedentary lifestyle is defined clinically (per Dr. Lavine's study) as exercising two times or less per week over a two-year period. This is the single most important and most common lifestyle factor driving EF decline. Determine whether the user meets this definition. If yes, this is the primary intervention target regardless of other categories.
4
Design or prescribe the Lavine Protocol aerobic training structure
Based on Dr. Ben Lavine's 2018 study with 50–55-year-old sedentary but otherwise healthy adults, the exercise intervention that reversed cardiac aging by nearly 20 years follows this specific structure: 4–5 sessions per week of significant aerobic training; 1 of those sessions per week must be very high-intensity training; 1–2 days per week are either cross-training or active recovery. Begin with a slow, gradual ramp-up — do not start at full volume. Maintain this structure over a sustained period (the study ran 2 years with over 80% adherence). The outcome benchmark is improvement in VO2 max (cardiovascular efficiency) and improved elasticity of both right and left ventricles.
5
Build the complementary lifestyle stack
Aerobic training is the primary lever but must be supported by: a structured, consistent strength training program to maintain or grow muscle; adequate and appropriate weight control; blood pressure management; and a solid whole foods diet. These are the cornerstones of lifestyle changes that directly affect ejection fraction. Do not treat them as optional additions — they are part of the protocol.
6
Determine whether medical intervention is needed in parallel
If echocardiogram reveals arterial blockages, valve abnormalities (blockage or leakage), or rhythm issues, medical intervention may be appropriate alongside lifestyle changes — not instead of them. Relevant medical options include: revascularisation (stent or bypass surgery) for coronary blockages; valve repair or replacement for blocked or leaking valves; rhythm management for atrial fibrillation or other arrhythmias; medications for heart failure (this is a complex category — defer to the treating cardiologist). The sequencing Dr. London implies: institute lifestyle modifications first, then layer medications if needed.
7
Track progress and maintain long-term adherence
The 20-year cardiac age reversal result in the Lavine study required sustained adherence (80%+ over 2 years). Progress should be tracked via repeat echocardiogram to assess ventricular elasticity and EF, and VO2 max as the functional cardiovascular efficiency marker. Remind the user: even before symptoms appear, EF decline is occurring. Consistency over time is the mechanism of reversal.

// What does the protocol look like in real cases?

A 52-year-old office worker, no known cardiac history, exercises once a week at most, has mild hypertension managed loosely with diet, and has never had an echocardiogram.

This user meets the sedentary lifestyle definition (≤2 sessions/week over an extended period) and has a pressure overload risk factor (hypertension). Step 1: order an echocardiogram to establish baseline EF and assess ventricular wall thickness and valve function. Step 2: categorise as lifestyle + pressure overload. Step 3: design the Lavine Protocol — slow ramp-up to 4–5 aerobic sessions/week including 1 high-intensity day and 1–2 cross-training/recovery days. Step 5: add strength training and tighten blood pressure management through a whole foods diet and weight control. If echo reveals thickened left ventricle wall consistent with hypertensive heart disease, flag for physician review of blood pressure medications.

A 48-year-old who had a mild heart attack two years ago, was told their EF is 45%, has resumed some activity but no structured program.

EF of 45% is at the low end of normal, approaching the ≤40% heart failure threshold — this is a crystal ball moment. Root cause: direct muscle damage (post-infarct scar tissue). Step 1: verify current EF via repeat echo and assess for wall motion abnormalities indicating scar. Step 2: categorise as direct muscle damage; confirm no ongoing coronary blockages warrant revascularisation. Step 4: begin gradual ramp-up into the Lavine Protocol aerobic structure — the study population was otherwise healthy but this user must ramp more carefully given cardiac history; medical clearance and potentially a supervised cardiac rehab entry point is appropriate. Step 5: whole foods diet, blood pressure control, weight management, strength training to protect muscle. Monitor VO2 max improvement and repeat echo at 6–12 months.

// What mistakes should you avoid when reversing cardiac aging?

Not getting an echocardiogram — EF decline can occur completely without symptoms, so waiting for symptoms before investigating is a critical error.
Treating ejection fraction as just a number rather than as a report card and crystal ball for future health and longevity outcomes.
Assuming a sedentary lifestyle is the only cause without checking the other four root cause categories — particularly missing pressure overload from uncontrolled hypertension or volume overload from a leaking valve.
Starting the aerobic training program at full intensity rather than using a slow, gradual ramp-up — the Lavine Protocol requires progressive loading, not sudden high-volume training.
Doing only yoga or stretching-style exercise and assuming it counts as cardiovascular training — the control group in the Lavine study (yoga/stretching) showed no significant improvement in ventricular elasticity or VO2 max.
Treating medications as the first line of intervention before instituting lifestyle modifications — medications are the next layer, not the foundation.
Believing cardiac aging is purely inevitable and nothing can be done — the Lavine study data directly refutes this; up to a nearly 20-year reversal in cardiac age is achievable with sustained adherence.

// What key terms should you understand for this protocol?

Ejection Fraction (EF): The percentage of blood ejected from the left ventricle with each heartbeat. Normal is 50–70%. At 40% or less, this indicates heart failure or significantly reduced heart function. The single most important determinant of cardiac outcomes and longevity.
Report Card (for heart function): Dr. London's framing of ejection fraction — a measurable grade of how efficiently your heart is performing its job, and a crystal ball for future health trajectory.
Crystal Ball: Dr. London's term for ejection fraction's predictive power — a low or declining EF forecasts future all-cause mortality risk (40–50% increase in 5-year all-cause mortality at EF <40%) before symptoms appear.
Closed Loop Pump: Dr. London's model of the heart: a simple pump where the right side drives blood to the lungs and the left side ejects oxygenated blood to the body, repeating in a continuous loop. Inefficiency anywhere in the loop reduces cardiac output.
Cardiac Output: The total volume of blood the heart ejects to fuel all organs — brain, liver, kidneys, etc. Directly reduced when ejection fraction falls, causing organ and systemic dysfunction.
Pressure Overload: A root cause category where the heart faces excessive resistance (e.g. high blood pressure, aortic stenosis), causing the left ventricle to thicken, the chamber to shrink, and eventually the heart to fail.
Volume Overload: A root cause category where a leaking heart valve causes blood to flow out of both the front and back doors, distending the heart, pulling muscle fibres apart, and making contraction progressively inefficient.
Sedentary Lifestyle (clinical definition): Per the Lavine study: exercising two times or less per week over a two-year period. Identified by Dr. London as the single most important and most common lifestyle factor driving ejection fraction decline.
The Lavine Protocol: Dr. Ben Lavine's 2018 structured aerobic exercise intervention: 4–5 aerobic sessions per week with 1 high-intensity session and 1–2 cross-training or active recovery days, ramped up gradually and sustained over 2 years. Produced up to 18% improvement in VO2 max and ventricular elasticity comparable to hearts nearly 20 years younger.
VO2 Max: A measure of cardiovascular efficiency — the maximum rate of oxygen consumption during exercise. Used in the Lavine study as the primary functional marker of improvement; increased by up to 18% in the exercise group.
Ventricular Stiffening: The normal aging process by which the right and left ventricles lose elasticity and compliance decade to decade, limiting filling capacity and pumping efficiency even in the absence of a heart attack.
Heart as Engine: Dr. London's analogy for the heart: fuel it properly (whole foods diet), keep it running properly (solid lifestyle choices), and take it out for a drive often (structured aerobic exercise) — and you will get more miles, and better quality miles.
Echocardiogram: A non-invasive ultrasound of the heart (gel on chest, ultrasound probe creates images) that estimates ejection fraction and evaluates all four heart valves. The primary and most critical diagnostic tool for assessing heart function — the first step in any evaluation.
BNP (Brain Natriuretic Peptide): A blood test used as a general indicator of whether a patient is in heart failure. Not used in every clinical scenario but can be a useful complement to echocardiogram findings.

// FREQUENTLY ASKED QUESTIONS

What is the Dr. London Heart Engine Optimisation Protocol?