ABSTRACT
Cerebral function depends on an uninterrupted oxygen (O2) delivery. The cerebral O2 reserve is low as illustrated by the immediate loss of consciousness with arrested cerebral blood flow (CBF) since the effect cannot be explained by depletion of intermediary metabolites. The exercise would improve brain function by increasing cerebral blood volume, however, the exact mechanisms are still unknown (Rasmussen et al., 2007). The advances in neuroimaging techniques have made it possible to investigate changes in the brain. It brought more understanding about cerebral activation processes, due to the close coupling of neural activity and brain metabolism, which accompany changes in cerebral blood flow (Timinkul et al., 2008).
