Kossioni A E, Karkazis H C
Department of Removable Prosthodontics, Experimental EMG Laboratory, Dental School, University of Athens, Greece.
Gerodontology. 1994 Jul;11(1):30-8. doi: 10.1111/j.1741-2358.1994.tb00100.x.
The effect of age on the masseteric jaw-jerk reflex was investigated in 22 young (11 males and 11 females with mean age 23.2 years) and 22 older dentate subjects (11 males and 11 females with mean age 61.3 years). Electromyographic (EMG) recordings were obtained, after chin taps, from the relaxed masseter muscle of the preferred chewing side, by use of a computerised recording and analysis system. With increasing age the occurrence of the reflex was reduced, the latency was increased, while the amplitude was decreased. Those findings are probably related to the general age related changes in the muscular tissue, the sense organs, the peripheral nerves and especially the central nervous system. Increased biological variance was also observed in the older subjects, as in most aspects of performance in the latent years. Furthermore, the effects of ageing were generally similar in men and women. The age-related decrement in the monosynaptic reflex response is indicative of a generalised decline in the motor performance of the stomatognathic system and the decreased ability of the older dental patient to easily adapt to any dramatic changes in the sensory input.
研究了年龄对咬肌下颌反射的影响，研究对象为22名年轻受试者（11名男性和11名女性，平均年龄23.2岁）和22名年龄较大的有牙受试者（11名男性和11名女性，平均年龄61.3岁）。在轻叩下巴后，通过计算机记录和分析系统，从偏好咀嚼侧放松的咬肌获取肌电图（EMG）记录。随着年龄的增长，反射的发生率降低，潜伏期延长，而幅度减小。这些发现可能与肌肉组织、感觉器官、周围神经尤其是中枢神经系统中与年龄相关的一般变化有关。在老年受试者中还观察到生物变异性增加，这与潜伏期大多数方面的表现情况类似。此外，衰老的影响在男性和女性中通常相似。单突触反射反应中与年龄相关的减退表明口颌系统运动性能普遍下降，以及老年牙科患者难以轻松适应感觉输入的任何剧烈变化。
