. DOMS itself is a common and rather unremarkable event in daily life. However, since hyperalgesic muscle in this DOMS model is reported to contain taut band-like muscle hardening and a trigger point-like sensitive spot (Itoh and Kawakita, 2002;Itoh et al., 2004), which are typical in myofascial pain syndrome (Russell and Bieber, 2006), uncovering the mechanism of DOMS in this model may shed light on the peripheral mechanism of the muscular mechanical hyperalgesia that occurs in pathological conditions.