title: Studies in muscle rigidity, nitrous oxide, and narcotic analgesic agents.
mesh_terms: D000328:Adult; D004576:Electromyography; D005283:Fentanyl / Q000494:pharmacology*; D006801:Humans; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D009129:Muscle Tonus / Q000187:drug effects*; D009132:Muscles / Q000187:drug effects*; D009609:Nitrous Oxide / Q000494:pharmacology*; D010423:Pentazocine / Q000494:pharmacology*; D012018:Reflex / Q000187:drug effects
chemical_list: D009020:Morphine; D009609:Nitrous Oxide; D010423:Pentazocine; D005283:Fentanyl