Delayed-onset muscle soreness (DOMS) refers to the skeletal muscle pain and tenderness that typically begins 12–24 hours after unaccustomed or particularly strenuous exercise, peaking around 24–72 hours. Unlike immediate exertional pain, DOMS often presents as a delayed inflammatory-leaning response associated with muscle microtrauma. The dominant mechanistic framework is that eccentric contractions and high-force loading cause structural disruption to myofibrils and the extracellular matrix, leading to “microtears,” subsequent calcium dysregulation, and activation of innate immune pathways. This triggers release of damage-associated molecular patterns, recruitment of neutrophils and macrophages, and downstream cytokine signaling (e.g., interleukins and tumor necrosis factor pathways), which contribute to nociceptor sensitization and reduced force production. DOMS is also linked to oxidative stress, mitochondrial dysfunction, and impaired cross-bridge cycling during the early recovery window.
Clinically, DOMS is characterized by muscle tenderness, reduced range of motion, decreased maximal voluntary contraction strength, and sometimes swelling. Creatine kinase and other biomarkers may rise, although biomarker levels do not correlate perfectly with pain intensity. Objective measures such as torque loss, delayed strength recovery, and changes in range of motion can track functional recovery. DOMS is generally self-limited and resolves as damaged fibers repair, satellite cells proliferate, and remodeling of the cytoskeleton and connective tissue occurs. While DOMS is not the same as rhabdomyolysis or severe muscle injury, it represents a physiologic stress response that can be mitigated by training adaptations. Repeated bouts of the same exercise can lead to the “repeated bout effect,” where subsequent sessions produce less soreness and smaller strength decrements, likely due to neural learning and peripheral muscle adaptations.
Nutritional modulation of DOMS has attracted interest because inflammation and oxidative stress are modifiable processes. Polyphenol-rich foods, particularly berries, contain anthocyanins and other flavonoids that exert anti-inflammatory and antioxidant effects through multiple pathways. Anthocyanins can influence redox status by scavenging reactive species and by upregulating endogenous antioxidant defenses via signaling cascades (e.g., Nrf2-related mechanisms, depending on bioavailability and tissue context). They may also attenuate inflammatory signaling by modulating transcription factors such as NF-κB, thereby reducing cytokine expression and downstream inflammatory mediators. The concept is not that berries “eliminate” the damage response, but that they may reduce excessive secondary injury and accelerate the restoration of contractile function.
Evidence from human studies has explored exercise-induced markers of inflammation, oxidative stress, and functional performance after berry consumption. Higher berry intake has been associated with lower circulating inflammatory markers including C-reactive protein (CRP). In exercise models, cherry-derived anthocyanins have been studied for post-exercise recovery. Reports include reduced soreness ratings and improved recovery of strength in short-term follow-up after strenuous resistance exercise or endurance events. One experimental finding described in educational resources is that dietary cherries can markedly reduce strength loss over several days in college men after eccentric-heavy bicep exercise. Additional studies have assessed pain reduction and recovery in long-distance runners, including potential improvements in marathon recovery outcomes.
Blueberry consumption has also been examined in athletes, with attention to oxidative stress and the recovery timeline of peak muscle strength. In controlled settings, oxidative stress increased in athletes after exercise when blueberries were not consumed, whereas with blueberries oxidative stress was reported to be lower and remained so during the recovery period. Functionally, a faster restoration of peak muscle strength was observed a day later in blueberry-fed participants. These findings are consistent with a model where berry polyphenols help buffer oxidative injury and inflammatory signaling that otherwise delay neuromuscular recovery.
Practically, individuals interested in DOMS mitigation should consider that benefits likely depend on dose, timing, type of berry (fresh, frozen, or dried without added sugar), baseline diet, exercise load, and individual variability in absorption and metabolism. For athletes and recreational lifters, DOMS can be reduced by progressive training, proper warm-up, and adequate sleep; nutrition may provide adjunctive support. While dietary polyphenols are generally safe as part of a balanced diet, they should not replace medical evaluation when symptoms are extreme (e.g., dark urine, severe weakness, or persistent pain beyond expected timelines).
Overall, delayed-onset muscle soreness reflects an interplay between mechanical microtrauma, inflammatory signaling, and oxidative stress that transiently impairs muscle contractility and comfort. Berry anthocyanins and related phytonutrients have plausible and supported effects on inflammatory and oxidative pathways, with human evidence indicating reduced soreness and accelerated recovery of muscle strength after strenuous exercise. Source: NutritionFacts.org
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