K. Inoue et al., RELEASE OF A SUBSTANCE THAT SUPPRESSES SPONTANEOUS MOTOR-ACTIVITY IN THE BRAIN BY PHYSICAL EXERCISE, Physiology & behavior, 64(2), 1998, pp. 185-190
Injection of the cerebrospinal fluid (CSF) collected from rats fatigue
d by obligatory swimming into the cisterna magna of mice suppressed th
e spontaneous motor activity of the mice. The suppressive activity was
abolished by heat denaturation of the CSF and was found in the CSF fr
action with a molecular weight above 10,000 after ultrafiltration. The
se findings suggest the presence of a substance(s) released in a fatig
ued animal's brain that suppresses its spontaneous motor activity and
generates the sensation of fatigue, (C) 1998 Elsevier Science Inc.