The blood pressure response during isometric exercise in fast and slow twitch skeletal muscle in the cat |
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Authors: | Jerrold S. Petrofsky Alexander R. Lind |
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Affiliation: | (1) Biomedical Engineering Laboratory, Depts. of Engineering and Physiology, Wright State University, 45435 Dayton, OH, USA;(2) Dept. of Physiology, St. Louis University, 63104 St. Louis, MI, USA |
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Abstract: | Summary The blood pressure response during fatiguing isometric contractions was examined in a slow twitch muscle (the soleus) and a mixed muscle (the medial gastrocnemius) of the cat. The results of these experiments showed that electrical stimulation of the ventral roots of the spinal cord which carried the efferent innervation to the soleus muscle failed to result in a blood pressure response during isometric exercise. Further, although stimulation of the fast twitch motor units in the medial gastrocnemius muscle was associated with a potent pressor response to isometric exercise, stimulation of the slow twitch motor units was associated with a markedly reduced response throughout the duration of the exercise. These findings infer that the pressor response to isometric exercise may be a function of the fast twitch motor units in the muscle. |
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Keywords: | Blood pressure Exertion Static exercise Pressor response |
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