Clarkson P M
Dept. of Exercise Science, Univ. of Massachusetts, Amherst 01003.
J Gerontol. 1978 Sep;33(5):650-6. doi: 10.1093/geronj/33.5.650.
Sixty male subjects were placed into four equal groups based upon age and level of physical activity: Old Active, Old Inactive, Young Active, and Young Inactive. The criterion measure of total patellar reflex time was fractionated into a central component, reflex latency, and a peripheral component, reflex motor time. Subjects were tested on 2 separate days and on each day, two blocks of ten patellar reflex trials were taken alternating trials between normal and Jendrassik conditions. A split plot analysis of variance showed that no statistically significant differences were found between any group for either of the fractionated components. Also, the amount of Jendrassik facilitation was similar for all four groups. The results suggested that the entire patellar stretch reflex apparatus and the system of alpha-gamma linkage may be unaffected by age and level of activity.
60名男性受试者根据年龄和身体活动水平被分为四个相等的组：老年活跃组、老年不活跃组、青年活跃组和青年不活跃组。髌反射总时间的标准测量被分为一个中枢成分，即反射潜伏期，和一个外周成分，即反射运动时间。受试者在2个不同的日子接受测试，并且在每一天，进行两组，每组十次髌反射试验，在正常和Jendrassik条件之间交替进行试验。方差的裂区分析表明，对于任何一个分组成分，在任何组之间均未发现统计学上的显著差异。此外，所有四组的Jendrassik易化量相似。结果表明，整个髌伸展反射装置和α-γ联动系统可能不受年龄和活动水平的影响。
