Effect of morphine on sympathetic nerve activity in humans.

@article{Carter2002EffectOM,
  title={Effect of morphine on sympathetic nerve activity in humans.},
  author={Jason R. Carter and Charity L. Sauder and Chester A. Ray},
  journal={Journal of applied physiology},
  year={2002},
  volume={93 5},
  pages={
          1764-9
        }
}
There are conflicting reports for the role of endogenous opioids on sympathetic and cardiovascular responses to exercise in humans. A number of studies have utilized naloxone (an opioid-receptor antagonist) to investigate the effect of opioids during exercise. In the present study, we examined the effect of morphine (an opioid-receptor agonist) on sympathetic and cardiovascular responses at rest and during isometric handgrip (IHG). Eleven subjects performed 2 min of IHG (30% maximum) followed… 
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