By methods of chronobiology, the effects of chrono-exercise on the circadian and amounts of glutamate neuro- transmitters in Rat's three brain levels (stem brain, diencephalon and telencephalon) were studied. The results showed that both neurotransmitters demonstrated a significant circadian, and chrono-exercise could make both amounts and circadian of the neurotransmitters .change. The changes of circadian concentrated on phase lead the changes of Mesor and amplitude. The changes of amounts displayed a ex...