What these findings suggest, the authors conclude, is that endurance training and weight training may have different physiological effects within the brain and cause improvements in different types of memory.
That idea tallies nicely with the results of the other recent study of exercise and memory, in which lab rats either ran on wheels or, to the extent possible, lifted weights. Specifically, the researchers taped weights to the animals’ tails and had them repeatedly climb little ladders to simulate resistance training.
Little weights taped to their tails? --ts