Abstract
The purpose of this study is to clarify the developmental phase of patellar reflex function. The reflex time is measured by electric counter which is linked with the electoroswitch hammer that hits the patellar ligament. The subjects are 1275 males and females aged 4 to 21 years.
The reflex time ranges from 72 to 169 milliseconds with the normal distribution curve. However, the knee stretch reflex function does not necessarily develop with age. This is probably because the patellar reflex function develops synchronously as the standing ability develops during infancy.
