Lifelong Aerobic Exercise Linked to Higher Physiological Reserve in Older Adults

A team of French researchers has found that older adults who have stayed aerobically active throughout their lives carry a measurably larger physiological reserve than their sedentary peers, offering some of the clearest evidence yet that decades of exercise shape how the body ages. The study, published in the journal GeroScience, focused on a concept known as vitality capacity, a working definition developed under the World Health Organization’s healthy ageing framework to capture the body’s functional reserve across multiple biological systems at once.

Vitality capacity sits within the broader idea of intrinsic capacity, the composite of physical and mental attributes that determine what an older person can do. Rather than tracking disease or disability, the framework asks how much slack the body still has. To quantify it, the researchers drew on twelve biomarkers distributed across three domains: immune and stress response, energy and metabolism, and neuromuscular function. Each domain was scored as a standardized z-score for the whole sample, and the domain scores were then averaged into a single global vitality capacity index for every participant.

The exploratory cross-sectional study compared twenty lifelong active adults with nineteen inactive but otherwise healthy adults, all aged over fifty-five. Lifelong activity status was established through validated questionnaires assessing habitual physical activity, complemented by objective measurement tools commonly used in ageing research, including accelerometry-based assessment of movement. The active group had sustained regular aerobic exercise over decades, while the inactive group had not, allowing the researchers to probe whether a lifetime of endurance activity leaves a detectable signature in the biology of ageing.

The headline result was unambiguous. Lifelong active participants scored on average 0.2 z-score units higher in overall vitality capacity than their inactive counterparts, a difference that remained statistically significant after adjustment for multiple comparisons, with an adjusted p-value of 0.009. Vitality capacity also declined with age across the whole sample, showing an inverse correlation of r = -0.53 with an adjusted p-value of 0.002. In other words, the physiological reserve erodes as the years accumulate, but people who have exercised throughout life appear to start from, and maintain, a higher baseline.

When the researchers broke the composite score down into its three domains, a more nuanced picture emerged. The neuromuscular domain, which encompasses muscle strength, fatigue resistance and related measures of physical function, contributed the most to inter-individual variability in vitality capacity. That finding aligns with a large body of gerontological work showing that neuromuscular decline is among the most consequential drivers of lost independence in later life, and it suggests that this domain carries substantial weight in any composite index of physiological reserve.

Yet the domain that actually separated the active from the inactive group was not neuromuscular function but immunity and stress response. This was the only domain significantly elevated in the lifelong active participants, by 0.4 z-score units, with an adjusted p-value of 0.001. The result is striking because it points to systemic, low-grade inflammation and immune regulation as the biological pathways most responsive to decades of aerobic exercise. Chronic, low-level inflammation, often described as inflammageing, is increasingly viewed as a central mechanism of age-related deterioration, and regular endurance activity is one of the few non-pharmacological interventions known to counter it.

The analytical approach behind these conclusions was deliberately careful. The team used principal component analysis to extract loadings and estimate the relative weights of the three domains within the composite score, ensuring that the global index reflected the actual structure of the biomarker data rather than an arbitrary equal weighting. Multiple correlation analyses were then run to map the associations among individual biomarkers, domain scores and the overall vitality capacity measure, with all key comparisons adjusted for multiplicity to guard against false positives in a small sample.

The study’s limitations are worth keeping in view. With only thirty-nine participants, it is exploratory by design, and its cross-sectional structure cannot prove that lifelong exercise causes higher vitality capacity. It remains possible that people with greater physiological reserve are simply more able and more inclined to remain active over the decades, a classic reverse-causality problem in exercise epidemiology. Genetic factors also shape muscle strength, lung function and immune profiles, and could contribute to both activity levels and reserve. Longitudinal and interventional studies will be needed to establish directionality, and the authors frame their findings as hypothesis-generating rather than definitive.

Even so, the work lands at a moment of intense interest in quantifying healthy ageing. Previous research has linked physical activity to longer life expectancy, preserved telomere length in master athletes, reduced age-related inflammation and better cardiorespiratory fitness, and large cohort studies have connected activity and reduced sedentary time to slower declines in intrinsic capacity. What this study adds is a composite, biomarker-based snapshot of the physiological reserve itself, showing that the benefit of lifelong aerobic activity is visible not just in single outcomes such as grip strength or lung volume but across an integrated biological profile.

For clinicians and public health planners, the implications are practical. Vitality capacity is emerging as a monitorable target for healthy longevity, with scoring systems and reference centiles under development in population cohorts, and the present findings reinforce the case for promoting sustained aerobic activity from midlife onward rather than waiting for old age. The neuromuscular domain’s dominance in explaining individual differences suggests that preserving muscle function remains central, while the immune advantage seen in lifelong exercisers hints that the anti-inflammatory effects of endurance training may be among the most durable rewards of an active life. The authors also note that the anonymized dataset behind the study has been deposited in the French open data repository, inviting wider scrutiny and reuse as the science of physiological reserve matures.

Subject of Research: Association between lifelong aerobic physical activity and vitality capacity, a biomarker-based measure of physiological reserve, in older adults

Article Title: Vitality capacity association with lifelong aerobic physical activity in older adults

Article References: Mercier, J., Guérin, O., Michel, E., Chorin, F., Loubat, A., Gautier, N., Rousseau, A.-S., & Colson, S. S. (2026). Vitality capacity association with lifelong aerobic physical activity in older adults. GeroScience. https://doi.org/10.1007/s11357-026-02504-4

Image Credits: AI Generated

DOI: 10.1007/s11357-026-02504-4

Keywords: vitality capacity, intrinsic capacity, healthy ageing, aerobic exercise, biomarkers, immune function, inflammageing, neuromuscular function, physiological reserve, older adults, GeroScience, physical activity