Why Does Muscle Soreness Last Longer Now?

Written by the Nuvirox Research Team

Short answer: the popular assumption is backwards. Pooled research comparing exercise-induced muscle damage across age groups has repeatedly found that older adults report less soreness after hard workouts, not more — even though the "it takes longer to recover" story is one of the most repeated pieces of fitness folklore. The honest caveat is that soreness and full functional recovery aren't the same thing, and some individual studies still find older muscle takes longer to regain full strength even when it hurts less along the way.

Isn't it obvious that older muscle recovers more slowly?

It's the intuitive assumption, but it isn't what the pooled data show. A 2025 systematic review and meta-analysis in the Journal of Aging and Physical Activity combined 36 studies comparing exercise-induced muscle damage (EIMD) in younger adults (18–25) against older adults (35+). Across measures of muscle function, soreness, and creatine kinase (a blood marker of muscle damage), advancing age was not associated with greater damage or a slower recovery trajectory. If anything, the opposite showed up in the pooled soreness data.

How much less sore were the older participants, really?

In the pooled analysis, reported muscle soreness was about 34% lower in older adults at 48 hours post-exercise and 62% lower at 72 hours, compared with younger adults. Creatine kinase, the enzyme that leaks out of damaged muscle fibers and is used as an objective marker of muscle injury, was roughly 28% lower in older adults at 24 hours. The researchers found no meaningful difference in how age affected recovery based on whether the exercise was resistance training or endurance-based, or whether it targeted the upper or lower body.

So why does everyone assume the opposite?

Part of it may be selection bias in daily life: people who exercise regularly into their 40s, 50s, and beyond tend to be a fitter subset of the population, and fitness itself blunts muscle damage. Part of it may simply be that a bad recovery day sticks in memory more than an average one. And part of it is that older lifters more often carry old injuries, joint changes, or reduced baseline strength — all of which can make a workout feel harder to bounce back from even when the muscle-damage biology looks similar.

What human studies actually show

The 2025 meta-analysis (Fernandes et al., n=779 across 36 studies) found no significant age-related increase in EIMD across soreness, strength loss, or creatine kinase, with soreness actually lower in the older group at 48 and 72 hours. This is the largest and most current pooled estimate available.

An earlier scoping review (Sports Medicine-Open, 2023) looked at individual studies rather than pooling them, and found a more mixed picture: several small studies of eccentric exercise in older versus younger women showed older participants had not regained baseline strength even 96 to 240 hours after exercise, despite similar or lower soreness ratings. This is the honest counterweight — soreness intensity and the time it takes to get your strength all the way back are two different outcomes, and they don't always move in the same direction.

A 2024 narrative review in Cells takes a more mechanistic, cautionary view, arguing that aged muscle shows delayed and less efficient recovery at the cellular level — citing anabolic resistance, stiffer extracellular matrix, mitochondrial changes, and altered satellite cell (muscle stem cell) function as plausible reasons recovery could still lag even when subjective soreness doesn't.

What this won't do

None of this research means age has zero effect on recovery capacity. Sample sizes in many of the underlying studies are small (often 10–20 people per age group), most used elbow flexor or quadriceps exercises that don't necessarily generalize to every type of training, and "older adults" in the largest meta-analysis started at just 35 — a much younger cutoff than most people picture when they think about aging muscle. If you're dealing with soreness that's severe, doesn't improve after about a week, or comes with dark urine, significant swelling, or an inability to move the joint, that's outside normal DOMS territory and worth a medical evaluation for rhabdomyolysis or injury.

What actually helps, regardless of age

The interventions with the most consistent evidence aren't age-specific: gradual progression in training load rather than large jumps in volume or intensity, adequate protein intake distributed across the day, sufficient sleep, and light active recovery like an easy walk. Grip strength, one of the clearest physical biomarkers of muscle aging, responds well to consistent resistance training over time, which is part of why researchers are keen to counter the "soreness means fragility" narrative — it can talk people out of the training that actually protects long-term strength.

FAQ

Does this mean older adults never get more sore than they used to?

Not necessarily — individual variation is large, and some smaller studies (particularly in resistance-trained women) have found the opposite pattern. The meta-analysis pools 36 studies and finds no consistent age penalty on average, but your own experience may not match the average.

If soreness isn't worse, why do workouts feel harder to bounce back from?

Soreness and functional recovery (strength, range of motion) are measured separately, and some individual studies have found older adults regain full strength more slowly even when they report less pain — the two don't always move together.

Should I change how I train based on this?

The main practical takeaway from the researchers is the opposite of caution: don't avoid strength training out of fear that aging muscle is fragile. The data suggest older muscle tolerates damaging exercise reasonably well.

What actually helps with muscle soreness regardless of age?

Gradual progression in training load, adequate protein intake, sleep, and light active recovery (easy walking, mobility work) have the most consistent evidence. Ice baths and specific supplements have much weaker or mixed support.

FROM NUVIROX

Why we formulated NAD+ Restore

We built NAD+ Restore around the idea that cellular energy production — not just muscle repair — is part of what shapes how you feel after a hard effort, whether that's a workout or just a long day on your feet.

The formula is under active review as we refine it, so we won't get into specific ingredient amounts here — but the goal has always been the same: support the cellular processes behind sustained energy, backed by a 60-day money-back guarantee so you have real time to notice a difference.

Learn more about NAD+ Restore →

The bottom line

If a hard workout leaves you sore for what feels like an unusually long time, age by itself is a weaker explanation than most people assume — the best current pooled evidence points the other way. What may genuinely change with age is how quickly full strength and range of motion return, which is a related but separate question from how much something hurts. Either way, the researchers' bottom line is a reassuring one: don't let a fear of prolonged soreness keep you out of the gym.

References

1. Fernandes JFT, Wilson LJ, Dingley AF, et al. Advancing Age Is Not Associated With Greater Exercise-Induced Muscle Damage: A Systematic Review, Meta-Analysis, and Meta-Regression. J Aging Phys Act. 2025. PMID: 40174882.
2. Li DCW, Rudloff S, Langer HT, Norman K, Herpich C. Age-Associated Differences in Recovery from Exercise-Induced Muscle Damage. Cells. 2024;13(3):255. PMID: 38334647.
3. Doering TM, Reaburn PR, Cox G, Jenkins DG. Comparison of Postexercise Nutrition Knowledge and Postexercise Carbohydrate and Protein Intake between Australian Masters and Younger Triathletes. Int J Sport Nutr Exerc Metab. 2016. (background, exercise nutrition in older athletes).

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.