The Effect of Exercise-training on Sarcoplasmic Reticulum Function in Fast and Slow Skeletal Muscle

Authors

D. H. Kim, Marquette UniversityFollow
G. S. Wible, Marquette UniversityFollow
Frank Arthur Witzmann, Marquette UniversityFollow
Robert H. Fitts, Marquette UniversityFollow

Document Type

Article

Language

eng

Format of Original

7 p.

Publication Date

6-8-1981

Publisher

Elsevier

Source Publication

Life Sciences

Source ISSN

0024-3205

Abstract

The effect of endurance exercise on the capacity of crube homogenates (CH) to sequester Ca²⁺ was determined in the slow type I soleus, the fast type IIA deep region of the vastus lateralis (DVL), and the fast type IIB superficial region of the vastus lateralis (SVL). The Ca²⁺ uptake capacity was affected by exercise in a fiber type specific manner. The fast-twitch SVL showed a 35% decrease in the maximal rate of Ca²⁺ uptake (V_max) and a significantly lower K_m while the slow soleus and fast DVL were unaltered. The time course of Ca²⁺ uptake, and the peak amount of Ca²⁺ sequestered was not altered by exercise in any of the muscles studied. The homogenates from the exercise-trained soleus muscles exhibited an increased ability to retain Ca²⁺ and in this capacity became more like fast muscle.

Comments

Life Sciences, Vol. 28, No. 23 (June 1981): 2671-2677. DOI.

Recommended Citation

Kim, D. H.; Wible, G. S.; Witzmann, Frank Arthur; and Fitts, Robert H., "The Effect of Exercise-training on Sarcoplasmic Reticulum Function in Fast and Slow Skeletal Muscle" (1981). Biological Sciences Faculty Research and Publications. 486.
https://epublications.marquette.edu/bio_fac/486