Gorbunova I M, Zalkind V I
Fiziol Zh SSSR Im I M Sechenova. 1979 Jun;65(6):855-61.
When studying responses of 500 muscle receptors to stretching of the m. triceps of the cat deafferented hindlimb, 23 cases revealed a transient decrease in the firing rate (DFR) of muscle spindles' receptors. The DFR occurs in the same receptor at different forms and rates of stretching approximately at the same area of stretching ("the DFR area"). When increasing the rate of stretching, the DFR effect is enhanced. The DFR effect seems to be due to a short-lasting unloading of the spindle area which contains the receptor terminals. The unhomogenous structure of the extrafusal muscle as well as various mechanical properties of the intrafusal muscle fibers can provide necessary conditions for the above effect.
在研究500个肌肉感受器对猫去传入后肢肱三头肌拉伸的反应时，23例显示肌梭感受器的放电频率出现短暂下降（DFR）。DFR在同一感受器上，以不同的拉伸形式和速率，大约在相同的拉伸区域（“DFR区域”）出现。当增加拉伸速率时，DFR效应增强。DFR效应似乎是由于包含感受器终末的梭内区域短暂卸载所致。梭外肌的不均匀结构以及梭内肌纤维的各种力学特性可为上述效应提供必要条件。
