Downhill running causes exercise-induced muscle damage that can cut performance; the least-accustomed suffer most, and prior exposure to downhill running is the best-supported preventive strategy
Compression and footwear remain unconfirmed
Key Findings
Downhill running (DR) is used as a whole-body model of eccentric muscle action and exercise-induced muscle damage (EIMD); in sport, DR sections of off-road and road races can accentuate EIMD and reduce performance by altering muscle structure and function.
EIMD is mostly assessed by isometric maximal voluntary contraction, blood creatine kinase and delayed-onset muscle soreness; slope, duration and running speed are the main influencing factors. Across previous studies the median protocol was -12% slope (IQR -15% to -10%), 40 min (30-45 min) at 11.3 km/h (9.8-12.9 km/h).
Regardless of protocol, people least accustomed to DR generally experienced the most EIMD.
There is growing evidence that prior exposure to DR is the most effective preventive strategy; the effectiveness of in-situ strategies such as compression garments and specific footwear remains to be confirmed.
The review stresses large discrepancies between studies in EIMD assessment, DR protocols and populations, which prevent firm conclusions on the most influential factors and on adaptive strategies.
Practical Application
The review's best-supported preventive strategy for downhill muscle damage is prior exposure to downhill running, and the least-accustomed runners are damaged most — before a hilly or mountain race, include downhill-running sessions so race-day descents are not the first eccentric load the quads have seen.
Compression garments and special footwear are not confirmed to help; do not rely on them in place of downhill training.
Not from this paper; the base's own practice: progress downhill volume and gradient gradually over several weeks; the first sessions will produce soreness that later ones will not. The review does not specify how many sessions are needed or how much protection they give.
Limitations
Narrative review; the authors themselves note discrepancies in EIMD assessment, protocols and populations that prevent firm conclusions; optimal dose/timing of downhill exposure is not defined and individualises.
The median study protocol (-12%, 40 min, 11.3 km/h) describes the research, not a training prescription.
How this entry was checked and changed
Content correction 2026-09-27
Title and lead claimed "a few progressive downhill-running sessions trigger a repeated-bout adaptation that sharply cuts later muscle damage, soreness and performance loss" -> abstract: "growing evidence" that prior exposure to DR is the most effective preventive strategy, with discrepancies between studies preventing firm conclusions; the number of sessions and the size of the protection are not stated.Wording aligned; the progression advice is now labelled as the base's own practice.
Added the abstract's findings: least-accustomed suffer most EIMD; slope/duration/speed as main factors with the median study protocol (-12%, 40 min, 11.3 km/h); compression and footwear unconfirmed.