In this Perspective, researcher Kimberly M. Vincent explores physiological resilience as an important dimension of measurable healthspan: not simply what the body can do today, but how securely that function is being maintained. Through concepts including carryover, compensation, reserve, and adaptive freedom, she examines how response and recovery may reveal changes that resting measurements alone can miss.
This Perspective builds on Nathan Price’s recent Healthspan Before It’s Over, extending the Measurable–Predictable–Modifiable framework by asking what health looks like in motion rather than at rest.
Key Insights
1. Normal Function Can Hide Increasing Effort
A resting measurement can look normal for very different reasons. A biological system may have ample capacity to respond—or it may be compensating more heavily to preserve the same outward result.
Glucose regulation provides a familiar example: glucose may remain within range even as declining insulin sensitivity requires greater insulin secretion to maintain it.
The observed output can remain stable while the regulatory work underneath it changes.
2. Recovery Can Reveal What a Snapshot Misses
Resilience becomes visible when the body is challenged.
A meal, workout, infection, stressful event, or physiological transition creates a response over time. How far the system moves, how quickly it recovers, and whether effects carry into the next challenge may reveal information that a resting measurement cannot.
This is why longitudinal measurement matters: health is not only a state, but a dynamic response.
3. Resilience Belongs Within Measurable Healthspan
Building on the Measurable–Predictable–Modifiable framework introduced in Healthspan Before It’s Over, resilience adds another dimension to Measurable: health measured in motion rather than only at rest.
Response, recovery, carryover, compensation, and reserve can provide dynamic information about how securely the current state is being maintained—and potentially strengthen what we can responsibly predict next.
4. Resilience Needs a Profile, Not Just a Score
Resilience is unlikely to change uniformly across the body.
Someone may retain excellent strength while metabolic flexibility narrows, or maintain cognition while sleep recovery worsens. A single composite score risks averaging away differences that may matter.
A more useful representation may therefore be a resilience profile: where capacity remains strong, where compensation may be increasing, and where closer investigation is warranted.
5. The Goal Is to Preserve Adaptive Freedom
Vincent uses adaptive freedom as conceptual shorthand for the breadth of workable responses available to preserve function.
The goal is not to eliminate stress or challenge. Healthy systems adapt. The aim is to preserve the capacity to respond and recover without each challenge progressively narrowing what remains possible.
As the Perspective puts it:
“The body can lose options before it loses output.”
Why This Matters
Most healthcare measurement is optimized to detect what has already changed.
Resilience asks an earlier question: How securely is today’s function being maintained?
That distinction matters for healthspan. If changes in response, recovery, compensation, or reserve can be detected before overt functional decline, they may help identify where closer measurement is warranted and where scientifically credible interventions can be tested.
The objective is not to predict one inevitable future. It is to recognize narrowing adaptive freedom early enough to preserve more possible paths.
Read the Full Perspective
Download the complete Perspective to explore:
- Carryover and the effects that remain after a stressor
- Compensation and the hidden cost of maintaining normal function
- Physiological challenge and recovery
- Reserve and resilience profiles
- Resilience within Measurable–Predictable–Modifiable
- Three illustrative cases across perimenopause, cardiometabolic change, and cognitive reserve
- Adaptive freedom as a framework for thinking about healthspan
