[Isokinetic measurements in adolescent runners]

The aim of the investigation was to study the course of the isokinetic parameters--peak torque, time range of tension development and fatigue index--in an age range from 13 to 19 years and to compare the results with those of competitive athletes of the same age specifically trained in running. For this purpose measurements of the flexors and extensors in the upper ankle joint, knee and hip were taken. The average for the six muscle groups correlated significantly in all three parameters not only with the age development but also with the degree of training. The individual muscle groups, however, differed widely. An increased frequency of injuries by certain ratios of peak torques between flexors and extensors was not found. Instead already in the physiological age development occurred relations that were connected with an increased frequency of injuries. Prospectively this suggests that the time range of tension development has additional influence here.