Abstract:
:The beneficial effects of physical activity for pain are denominated exercise-induced hypoalgesia (EIH). Here, we examined the age-related change and potential role of the neurosteroid allopregnanolone (ALLO) on EIH in rats. Adult and aged rats were randomly divided into one of three groups; non-exercise control, Low-exercise, and High-exercise. The animals in the Low- and High-exercise groups were subjected to a 10-minute treadmill workout at 40% and 80% maximum oxygen intake intensity, respectively. In the Low-exercise groups, a significant EIH response was observed in aged but not in adult rats. The pre-treatment with ALLO synthesis inhibitor finasteride, but not opioid-receptor antagonist naloxone, inhibited the Low-exercise induced EIH response in aged rats. Furthermore, the Low-exercise increased brain ALLO levels in aged animals compared with controls, which was correlated with the mechanical pain sensitivity. On the other hand, High-exercise could induce EIH response in both adult and aged animals, but it was more effective in adult rats. The pre-treatment with naloxone, but not finasteride, reduced the EIH observed after High-exercise in both adult and aged rats. Our findings demonstrated that effective EIH can be achieved even by mild-intensity exercise in aged animals via an increase of the brain ALLO levels.
journal_name
J Pharmacol Scijournal_title
Journal of pharmacological sciencesauthors
Aoyama B,Kawano T,Iwata H,Nishigaki A,Yamanaka D,Tateiwa H,Shigematsu-Locatelli M,Eguchi S,Locatelli FM,Yokoyama Mdoi
10.1016/j.jphs.2018.11.009subject
Has Abstractpub_date
2019-02-01 00:00:00pages
77-83issue
2eissn
1347-8613issn
1347-8648pii
S1347-8613(18)30213-5journal_volume
139pub_type
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