[Increase in the contractile force of the skeletal muscles during the reflex activation of the sympathetic nervous system].
In anesthetized cats, the muscles of hindlimb if contracting in steady-state regimen (one brief tetanic contraction every 5 sec) under direct stimulation with trains of electrical pulses increase their contraction force following a sudden decrease of arterial blood pressure (down to 60 mm Hg) or asphyxia. This reflex reaction reaches its maximum (the increase in the force by 38.2 +/- 6.6%) if the muscle contracts with 25% of the maximal force. The sympathetic nerve influence is transduced through beta adrenoreceptors.
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D000818:Animals; D001237:Asphyxia / Q000503:physiopathology; D001794:Blood Pressure / Q000502:physiology; D002415:Cats; D004558:Electric Stimulation; D004837:Epinephrine / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects / Q000502:physiology*; D010646:Phentolamine / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D011942:Receptors, Adrenergic, alpha / Q000187:drug effects / Q000502:physiology; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000502:physiology; D012018:Reflex / Q000187:drug effects / Q000502:physiology*; D013564:Sympathetic Nervous System / Q000187:drug effects / Q000502:physiology*
D011942:Receptors, Adrenergic, alpha; D011943:Receptors, Adrenergic, beta; D011433:Propranolol; D004837:Epinephrine; D010646:Phentolamine
Povyshenie sily sokrashcheniia skeletnykh myshts pri reflektornoĭ aktivatsii simpaticheskoĭ nervnoĭ sistemy.