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From Fellrnr.com, Running tips
→How long does DOMS last?
* There are some studies that indicate there are possible changes in muscle fiber recruitment patterns<ref name="Miles-1997"/><ref name="Zhou-1998"/><ref name="Zhou-1996"/>.
=How long does DOMS last?=
It seems likely that exercise characteristics (duration, intensity, etc.) will change the time to recovery<ref name="Vickers-2001"/><ref name="Paschalis-2005"/>. The soreness generally peaks between 24-72 hours after the damaging exercise, but will last at least 4 days<ref name="Paschalis-2005"/>. My personal experience is that DOMS can last for over a week, and I prefer to avoid [[Downhill Training]]in the two weeks before a race, though sometimes I will include it as close as 10 days beforehand.
=The effect of steepness on DOMS=
I have found that steeper descents produce disproportionately severe DOMS. This might be due to the angle of the knee, as most<ref name="Jones-1989"/><ref name="Child-1998"/> (but not all<ref name="Paschalis-2005"/>) studies indicate that the longer a muscle is when being stressed, the greater the DOMS. This effect is most noticeable when using a [[Treadmill]] for downhill training, as small changes in angle can produce a big difference in DOMS.
