Extended Swimming Exercise Reduces Inflammatory and Peripheral Neuropathic Pain in Rodents

Karen E. Kuphal, Eugene E. Fibuch, Bradley K. Taylor

Research output: Contribution to journalArticlepeer-review

131 Scopus citations


Physical exercise is often recommended to patients who have chronic pain. However, only a small number of studies report exercise-induced analgesia in the setting of inflammatory pain, and even fewer relate long-term exercise to reductions in neuropathic pain. To address these questions, we evaluated the effect of extended swimming exercise in animal models of inflammatory (intraplantar injection of dilute formalin) and neuropathic (partial peripheral nerve injury) pain. We found that 9 days of swimming exercise in 37°C water for 90 min/d decreased licking and flinching responses to formalin, as compared with nonexercised control animals. In addition, 18 to 25 days of swimming decreased nerve injury-induced cold allodynia and thermal hyperalgesia in rats, and 7 days of swimming decreased nerve injury-induced thermal hyperalgesia in mice. Our data indicate that swimming exercise reduces behavioral hypersensitivity in formalin- and nerve injury-induced animal models of persistent pain. Perspective: Surprisingly, few animal studies have investigated the effects of extended exercise on chronic pain. Our results support the use of exercise as a nonpharmacological approach for the management of peripheral neuropathic pain.

Original languageEnglish (US)
Pages (from-to)989-997
Number of pages9
JournalJournal of Pain
Issue number12
StatePublished - Dec 2007
Externally publishedYes

Bibliographical note

Funding Information:
Supported by NIH grant NS45954 to B.K.T. and St. Luke’s Foundation funds to E.E.F.


  • Formalin
  • allodynia
  • hyperalgesia
  • mouse
  • rat


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