| Type | MGI:General | Description | papillary muscle fibers exhibit increased calcium sensitivity of steady state force development in both sedentary and exercised groups maximal steady state force developed by muscle fibers is decreased in both sedentary and exercised groups muscle fibers show an increased rate of force activation and moderately increased rate of relaxation cardiac muscle is less sensitive to acidic pH and shows a smaller decrease in calcium-sensitivity of force development indicating a loss of sensitivity to pH-induced shifts in calcium dependence of force large increase in the calcium sensitivity of the ATPase activity and force development in skinned fibers |
