In this text,we paid attention to the influence of the central fatigue on the situation assessment ability in soccer
game and reviewed the findings that attached to 1)the physiological responses in soccer,2)the relationship between
physical exercise and calculation result, and 3)ammonia as the central fatigue factor.
1) The high intensity movements such as jumps, turns, kicks, dribbles and tackles are irregularly demanded
based on the run movements of various intensities in soccer game.The average oxygen intake under the game is in
the range of 70-80％VO2max. Moreover, it would be true that there exists the phase the blood lactate value
temporarily becomes 10mmol/l or more if it conjectures from the data during or immediately after the game. 2)
There are a lot of findings that admit the reverse-U relationship between the exercise load and the calculation result.
In that case, the exercise load might be appropriate to imply the exercise intensity and the exercise duration.
Moreover, the investigation on both sides (the answer speed and accuracy)is needed further. In addition, after the
fatigue tolerance of subjects to the exercise is considered,it is necessary to discuss these issues.3)It is conjectured
that the main route of ammonia production is a purine nucleotide cycle in skeletal muscle during exercise, and the
ammonia production rises at the high intensity exercise that the fast twitch fibers are recruited and the fatigue with
a decrease in pH. Moreover, the exercise raises the blood ammonia and the brain ammonia via the blood brain
barrier,and it can be true that the enhanced brain ammonia suppress the brain energy metabolism.In addition,it can
be thought that decreases of glutamic acid and GABA by enhancement of the brain ammonia metabolism have
negative influences on the neurotransmission function and the performance of endurance exercise, respectively.