The purpose of this study was to investigate the injurious influence of aerobic dancing on the lower limbs injuries. Subjects were personally interviewed about exercise hours and the intensity of their classes, together with experience of injury, and their body configurations, alignments, ranges of motion, and muscular strengths were measured. EMG during aerobic dance exercise was measured in subjects with knee Q angles over and under 20 degrees.
The incidence of lower limb injury was 64.3%, and the most frequent injury was shin splint. The injured individuals had significantly more high-intensity classes than normal. As to body configuration, the width in patella per femur was significantly lower and the value of patellar ligament per height was significantly higher in the injured than in the normal subjects. The range of motion of hip external rotation in the injured was significantly smaller than that in the normal subjects. EMG discharge of the vastus medialis in the injured with a knee Q angle of over 20 degrees was markedly greater than that in normal subjects with an angle of less than 20 degrees.