Hiraki Y, Kimura H, Mizukawa K, Tabuchi A
Department of Ophthalmology, Kawasaki Medical School, 577 Matsushima, Kurashiki 701-01, Japan.
Nippon Ganka Gakkai Zasshi. 2001 Nov;105(11):745-9.
To evaluate the mechanical properties of slow fibers and fast fibers which make up the extraocular muscles in rabbits.
I studied the contractile properties and viscoelastic properties of the superior rectus muscle(SR) and the retractor bulbi muscle (RB) of rabbits using the quick release method and the frequency response method.
In the quick release method, isometric tension transients were slower in the SR than in the RB. In the frequency response method, the muscle length is perturbed sinusoidally to measure kinetic viscoelasticity. In resting muscle, dynamic stiffness was not changed with increasing frequency. In contracted muscle, dynamic stiffness was increased with increasing frequency, and the rate of increase was greater in the SR than in the RB.
It was concluded that the viscoelasticity of the activated cross bridge is greater in slow fibers than in fast fibers.
评估构成兔眼外肌的慢肌纤维和快肌纤维的力学特性。
我采用快速释放法和频率响应法研究了兔上直肌（SR）和眼球退缩肌（RB）的收缩特性和粘弹性特性。
在快速释放法中，SR的等长张力瞬变比RB慢。在频率响应法中，肌肉长度以正弦形式受到扰动以测量动态粘弹性。在静息肌肉中，动态刚度不随频率增加而变化。在收缩肌肉中，动态刚度随频率增加而增加，且SR的增加速率比RB大。
得出的结论是，慢肌纤维中活化横桥的粘弹性比快肌纤维大。
