Muscle blood flow changes during sleep as a function of fibre type composition.
In rabbits blood flow was measured in 19 muscles with the radioactive microsphere technique. Fibre type composition (SO, slow-twitch oxidative; FOG, fast-twitch oxidative-glycolytic; FG, fast-twitch glycolytic) was determined histochemically for the same muscles. While no significant changes occur in the transition from quiet wakefulness (QW) to synchronized sleep (SS), in desynchronized sleep (DS) blood flow decreases in SO and increases in FOG and FG fibres. These changes may be related to the changes in motor activity characteristic of DS: muscle atonia and twitches, respectively.
Lenzi
P
P
Institute of Human Physiology, University of Bologna, Italy.
Cianci
T
T
Leonardi
G S
GS
Martinelli
A
A
Franzini
C
C
D000818:Animals; D001783:Blood Flow Velocity; D008863:Microspheres; D009132:Muscles / Q000098:blood supply* / Q000166:cytology / Q000502:physiology; D011817:Rabbits; D012890:Sleep / Q000502:physiology*