Abstract
The effect of endurance exercise on the capacity of crube homogenates (CH) to sequester Ca 2+ 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 Ca 2+ 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 Ca 2+ uptake (V max) and a significantly lower K m while the slow soleus and fast DVL were unaltered. The time course of Ca 2+ uptake, and the peak amount of Ca 2+ 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 Ca 2+ and in this capacity became more like fast muscle.
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