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      Topical thermal therapy with hot packs suppresses physical inactivity-induced mechanical hyperalgesia and up-regulation of NGF.

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          Abstract

          We focused on the analgesic effect of hot packs for mechanical hyperalgesia in physically inactive rats. Male Wistar rats were randomly divided into four groups: control, physical inactivity (PI), PI + sham treatment (PI + sham), and PI + hot pack treatment (PI + hot pack) groups. Physical inactivity rats wore casts on both hind limbs in full plantar flexed position for 4 weeks. Hot pack treatment was performed for 20 min a day, 5 days a week. Although mechanical hyperalgesia and the up-regulation of NGF in the plantar skin and gastrocnemius muscle were observed in the PI and the PI + sham groups, these changes were significantly suppressed in the PI + hot pack group. The present results clearly demonstrated that hot pack treatment was effective in reducing physical inactivity-induced mechanical hyperalgesia and up-regulation of NGF in plantar skin and gastrocnemius muscle.

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          Author and article information

          Journal
          J Physiol Sci
          The journal of physiological sciences : JPS
          Springer Science and Business Media LLC
          1880-6562
          1880-6546
          Sep 2018
          : 68
          : 5
          Affiliations
          [1 ] Department of Functional Anatomy, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan.
          [2 ] Faculty of Rehabilitation Sciences, Department of Physical Therapy, Nagoya Gakuin University, 1350 Kamishinano-cho, Seto, 480-1298, Japan.
          [3 ] Department of Physical Therapy, College of Life and Health Sciences, Chubu University, 1200 Matsumoto-cho, Kasugai, Japan.
          [4 ] Faculty of Rehabilitation Sciences, Department of Physical Therapy, Nagoya Gakuin University, 1350 Kamishinano-cho, Seto, 480-1298, Japan. tomokoed@ngu.ac.jp.
          Article
          10.1007/s12576-017-0574-4
          10.1007/s12576-017-0574-4
          29027134
          9a7ecc2c-1597-42a4-a592-da8cba284da7

          Physical inactivity,Analgesia,Mechanical hyperalgesia,Nerve growth factor,Thermal therapy

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