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Low-Intensity Exercise Reverses Chronic Muscle Pain in the Rat in a Naloxone-Dependent Manner
Journal article   Peer reviewed

Low-Intensity Exercise Reverses Chronic Muscle Pain in the Rat in a Naloxone-Dependent Manner

Marie K Hoeger Bement and Kathleen A Sluka
Archives of physical medicine and rehabilitation, Vol.86(9), pp.1736-1740
2005
DOI: 10.1016/j.apmr.2005.03.029
PMID: 16181935

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Abstract

Hoeger Bement MK, Sluka KA. Low-intensity exercise reverses chronic muscle pain in the rat in a naloxone-dependent manner. To determine the effects of low-intensity exercise on chronic muscle pain and potential activation of the endogenous opioid system. Randomized placebo-controlled trial. Animal laboratory. Sixty-three male Sprague-Dawley rats. Rats performed a low-intensity exercise protocol for 5 consecutive days after the induction of chronic muscle pain. In a separate experiment, naloxone or saline was administered systemically before 5 low-intensity exercise sessions. Mechanical hyperalgesia was measured using von Frey filaments to determine the mechanical withdrawal threshold. Low-intensity exercise increased mechanical withdrawal threshold in the chronic muscle pain model. Naloxone attenuated the antihyperalgesic effects of low-intensity exercise. Low-intensity exercise reversed mechanical hyperalgesia in the chronic muscle pain model through activation of the endogenous opioid system.
Exercise Pain Analgesia Rehabilitation Opioids

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