REF-1306 · Fernandes et al., 2025 · Journal of Aging and Physical Activity · Paper · PubMed

Do I need longer between hard sessions because I am older?

Not for muscle damage: across 36 studies, strength loss 24-72 h after damaging exercise did not differ by age; soreness and CK were lower in the older.

Main caveat: Read from the abstract only; included populations, exercise types, training status, heterogeneity, intervals and risk of bias could not be checked.
fairly strong evidenceMeasured on non-athletes to trained athletes

Fernandes and colleagues ran a PRISMA-accordant meta-analysis comparing exercise-induced muscle damage in older and younger adults. They searched Google Scholar, PubMed and SPORTDiscus in June 2023 with terms for age (including "masters" and "veteran") and muscle damage, soreness or creatine kinase.

Of 1092 titles, 36 studies compared a younger with an older group after an exercise bout. Outcomes were muscle function, muscle soreness and creatine kinase, pooled as standardised mean differences with an inverse-variance random-effects model. The change in muscle function at 24 h and 72 h, and its peak change, did not differ between old and young (SMD −0.16 to −0.35).

Soreness was greater in the younger adults for every comparison (SMD −0.34 to −0.62), and creatine kinase was greater in the younger at 24 h (SMD −0.32) and at its peak (SMD −0.32).

The abstract adds that a relationship between sex and peak muscle-function change was "evident for males (SMD = −0.45), but not females (SMD = −0.44)"; with near-identical SMDs and no intervals or study counts, this is not evidence that men and women differ, and it may mean the older-younger difference at peak reached significance only in the male studies (our reading); all other meta-regressions were non-significant.

The authors conclude that advancing age is not associated with greater symptoms of muscle damage and that older adults can pursue regular activity without concern for greater damage.

Our reading: pooled support for the base's line that a masters athlete's gap after damaging work is widened on what monitoring shows, not on age; it does not show that older athletes recover endurance quality as fast, which was not measured.

Protocol

Search: Google Scholar, PubMed and SPORTDiscus, June 2023; age terms ("ageing", "age", "middle-aged", "old", "older", "elderly", "masters", "veteran") combined with muscle-damage terms ("muscle damage", "exercise-induced muscle damage", "exercise-induced muscle injury", "contraction-induced injury", "muscle soreness", "delayed onset muscle soreness", "creatine kinase").
Studies: 1092 titles screened; 36 included, each with an exercise component comparing a younger and an older group. Participant total, age ranges, training status and exercise types are not in the abstract.
Outcomes: muscle function, muscle soreness, creatine kinase; change after exercise at 24 h and 72 h and peak change.
Analysis: SMD, inverse-variance random effects; meta-regression (sex and other moderators, not all listed in the abstract).
Familiarity: not stated; the damaging protocols were presumably unaccustomed in most included studies (inference).
Funding and interests: not stated in the abstract or the PubMed record.

Key Results

Older vs younger adults after the same damaging exercise (abstract; negative SMD = smaller change in the older group, as the abstract's soreness and CK statements imply):

OutcomeTime pointSMD (older vs younger)Result
Muscle function (strength or function loss)24 h, 72 h, peak−0.16 to −0.35not different
Marker — muscle sorenessall comparisons−0.34 to −0.62greater in the younger
Marker — creatine kinase24 h−0.32greater in the younger
Marker — creatine kinasepeak−0.32greater in the younger
Meta-regression: peak muscle-function change, men—−0.45relationship "evident"
Meta-regression: peak muscle-function change, women—−0.44not evident
All other meta-regressions——non-significant
Confidence intervals, I², the number of studies per outcome and per sex are not in the abstract.

Mechanisms

Measured: older groups lost about as much function as younger ones and reported less soreness, with smaller creatine kinase rises.
Authors' interpretation: advancing age is not associated with greater symptoms of muscle damage; older adults need not fear greater damage from regular activity.
Inference: less soreness and creatine kinase in older people may partly reflect lower absolute loads, less muscle mass or a blunted inflammatory signal rather than less damage; soreness is a poor gauge of readiness in either group.
Inference: the sex finding (men −0.45 "evident", women −0.44 not) is nearly the same effect size, so it cannot be read as a sex difference; whether precision (the number of studies per sex) explains it cannot be told from the abstract, which gives no intervals or counts.

Practical Application

Do I need longer between hard sessions because I am older? Not for muscle damage: across 36 studies, strength loss 24-72 h after damaging exercise did not differ by age; soreness and CK were lower in the older.
Do not widen the gap after a familiar lift by age alone (this meta-analysis: function loss did not differ by age); REF-598 agrees in general but names muscle-damaging exercise as the case where an age effect on recovery is most suggested.Not from this paper; the base's own practice: widen the gap on evidence from monitoring, not on age alone (SYNTH-31, SYNTH-35), but after unaccustomed eccentric load a longer window and a gradual ramp (SYNTH-35), and 48-72 h between hard eccentric sessions in older athletes (SYNTH-23).
Lower soreness in an older athlete is not proof of recovery — function loss was the same while soreness was smaller (inference from this paper).
This paper does not cover endurance quality after damage in masters athletes, nor slower recovery after unaccustomed events such as a trail race, which a masters review reports (REF-598); keep the base's caution after first exposures (SYNTH-35).

Limitations

Read from the abstract only; included populations, exercise types, training status, heterogeneity, intervals and risk of bias could not be checked.
Age-group comparisons are observational: older and younger samples may differ in fitness, load used and exercise familiarity.
Outcomes are muscle function, soreness and creatine kinase; no endurance performance, and no 48-h function result in the abstract.
Older samples are probably mostly non-athletes (inferred); the result may not hold for masters athletes after very long or eccentric-heavy events.
Funding and conflicts of interest: not stated.
How this entry was checked and changed
Why this level

a meta-analysis of 36 studies, but the included studies are age-group comparisons (age cannot be randomised), the outcomes are markers and muscle function rather than performance, and heterogeneity, participant numbers and confidence intervals are not in the abstract; read from the abstract (the full text is not open; OpenAlex lists a Liverpool John Moores accepted version not marked open access, with only an ORCID link)