DOMS: Delayed Onset Muscle Soreness — mechanism and what actually works

Delayed onset muscle soreness (DOMS) is familiar to anyone who returns to training after a break or performs an unfamiliar exercise for the first time. Despite the ubiquity of the phenomenon, its mechanism was long debated, and methods for accelerating recovery were largely based on tradition rather than evidence.

Why DOMS occurs — and why with a delay?

DOMS is triggered primarily by eccentric muscle contractions — when a muscle lengthens under load (the lowering phase of a barbell lift, descending stairs, downhill running). During such contractions, the mechanical stress per unit cross-sectional area is significantly higher than during concentric contractions, leading to micro-tears in myofibrils and the sarcolemma.

The development of DOMS is described in the review by Stožer et al. (Physiological Research, 2020): neutrophils migrate into damaged tissue within the first 2 hours; macrophages predominate by the end of the first day; pro-inflammatory cytokines IL-1β and TNF-α persist for up to 5 days. It is prostaglandins, histamine, and bradykinin — mediators of the inflammatory cascade — that sensitise type III (Aδ) and IV (C) mechanoreceptors, lowering their excitation threshold. Pain appears not at the moment of exercise but 12–48 hours later, because the inflammatory response unfolds gradually. The typical peak is 24–72 hours, with full resolution in 5–7 days.

DOMS is a poor marker of workout effectiveness

It is widely believed that post-workout soreness indicates its productivity: "no pain, no gain." This is not supported by the evidence. Stožer et al. (2020) explicitly state: DOMS intensity only weakly correlates with the actual extent of muscle fibre damage and the degree of inflammation. The absence of pain does not mean a workout was ineffective. Meanwhile, adapted athletes with experience performing eccentric exercises show significantly less DOMS at the same training volume — this is the "repeated bout effect": muscles protect themselves rather than becoming less adaptive.

What actually reduces DOMS: evidence from meta-analyses

Cold-water immersion

The most studied intervention in the context of DOMS. Wang et al. conducted a network meta-analysis of 55 randomised controlled trials involving 1,139 participants (Frontiers in Physiology, February 2025). The analysis found that the optimal protocol for reducing DOMS is immersion in water at 11–15°C for 10–15 minutes: standardised mean difference SMD = −1.45 (95% CI: −2.13 to −0.77), representing a large effect size. For reducing blood markers of muscle damage (creatine kinase), colder protocols — 5–10°C for the same 10–15 minutes — are more effective.

An important caveat: systematic use of cold-water immersion immediately after hypertrophy-focused workouts may blunt the anabolic adaptive signal — the very signal that triggers muscle fibre remodelling in response to load. This is worth considering when choosing a strategy depending on your goals.

Massage

Guo et al. conducted a meta-analysis of 11 RCTs with 504 participants (Frontiers in Physiology, September 2017). Massage significantly reduced subjective pain throughout the entire observation period: SMD = −0.61 at 24 hours, SMD = −1.51 at 48 hours, SMD = −1.46 at 72 hours. Additional reductions in creatine kinase activity (SMD = −0.64) and improvements in maximum isometric strength (SMD = 0.56) were also recorded. The mechanism involves activation of mechanoreceptors and large afferent fibres that suppress nociceptive transmission via gate control.

Active recovery

Light low-intensity aerobic activity — walking, swimming, easy cycling — accelerates circulation, enhances lymphatic drainage, and promotes metabolic clearance of pro-inflammatory mediators from muscle tissue. There are fewer large direct RCTs comparing this to passive rest in the context of DOMS than for cold-water immersion, but active recovery is a low-risk intervention with sound physiological rationale.

What to use with caution

Non-steroidal anti-inflammatory drugs (NSAIDs, e.g. ibuprofen) effectively reduce pain by inhibiting the prostaglandin cascade. However, regular use of NSAIDs in a training context may blunt the inflammatory adaptive signal — precisely the one that triggers muscle fibre remodelling in response to load. In specific cases — when severe pain impairs function — their use is justified. As a routine recovery tool after every workout it is not advisable.

Static stretching immediately before or after a workout does not reduce DOMS to a clinically meaningful degree — data from systematic reviews on this point are consistent. Stretching is beneficial for joint mobility, but it is not a tool for preventing DOMS.