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Contraction force mobilisation by ischemia in cat fast-twitch and slow-twitch skeletal muscles



Contraction force mobilisation by ischemia in cat fast-twitch and slow-twitch skeletal muscles



Proceedings of the Latvian Academy of Sciences Section B Natural Exact & Applied Sciences 55(2-3): 96-99



The transient increase of skeletal muscle contraction force mobilisation in ischemic conditions was investigated in fast-twich (musculus gastrocnemius) and slow-twitch (M. soleus) muscles in cat. In anaesthetised (urethane-alpha-chloralose) cats, gastrocnemius muscle in one leg and soleus muscle in the other, were stimulated simultaneously by brief trains (0.33 s) of rectangular-wave electrical impulses (0.1 ms and 100 Hz) once every 2 s. The blood supply of one of the two muscles was suddenly interrupted by a tourniquet on the thigh for 7 min. During this time, after a latent period of 63+-19 s, there was an increase in gastrocnemius muscle contraction force by 106+-31%. The soleus muscle was mobilised less: latent period was 56+-17 s; increase of force, 47+-7%. After a blockade of the sympathetic ganglions by i.v. injection of benzohexony, the ischemia-induced increase of force in gastrocnemius muscle was significantly less (by 58+-15%) than before the blockade, but in soleus muscle the reaction did not considerably differ (increase of force by 45+-15%) from that of the undisturbed sympathetic nervous system. This indicated that the ischemic-mobilisation of skeletal muscle contraction force was more effective in fast-twitch, in comparison with slow-twitch, muscles. Also, the influence of the sympathetic nervous system in realisation of this reaction is more expressed in the fast-twitch muscles.

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Accession: 010381182

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