Effects of repeated + Gz forces on masticatory muscles.
- Author:
Zhenyu SUN
1
;
Min HU
;
Yin YIN
;
Liang MA
;
Ping DU
;
Ping WANG
Author Information
- Publication Type:Journal Article
- MeSH: Animals; Hypergravity; Male; Masseter Muscle; pathology; ultrastructure; Masticatory Muscles; pathology; ultrastructure; Microscopy, Electron; Pterygoid Muscles; pathology; ultrastructure; Rats; Rats, Wistar; Temporal Muscle; pathology; ultrastructure; Time Factors
- From: Chinese Journal of Stomatology 2002;37(5):327-329
- CountryChina
- Language:English
-
Abstract:
OBJECTIVETo study the effects of repeated + Gz forces on masticatory muscles.
METHODS48 male Wistar rats were randomly divided into 4 groups. Group A was normally fed. Group B was only fixed with rat-kept devices for 5 minutes. Group C was borne + 1 Gz for 5 minutes. Group D was repeatedly exposed + 10 Gz (each for 30 s, onset rate about 0.5 G/s, 5 times/d with + 1 Gz 1 minute intervals, 4 d/wk, 3 weeks in total). The histological changes of the masseter, temporal and lateral pterygoid muscles were observed.
RESULTSNo abnormal changes were observed in Group A, B and C. But pathological changes could be found in group D. The wrench and deformation of muscular fibers, the dissolution of partial myofibril, the swelling of mitochondria, the reduce of hepatin from the masseter and lateral pterygoid muscles could be found.
CONCLUSIONSRepeated + Gz stresses could induce the damage of masticatory muscles in different degrees.
