Neural and biomechanical differences between men and young boys during a variety of motor tasks

Publisher Website
Google Scholar
Abstract
The adaptation in activation patterns of the ankle extensor muscles to different functional demands a‐as studied in adult men (n = 10) and 9‐year‐old boys (n= 10). The relative magnitude of the activation of the slow soleus (SOL) and the relatively fist medial gastrocnemius (MG) muscle was measured during various postures and hopping tasks on a force plate. In addition, the myo‐electric activity was quantificd in three different phases of the stretchbshortening cycles during hopping. Major differences between boys and adults were observed in the postul‐al tasks, where the boys appeared to utilize the MG to a relatively larger extent. During maximal height hopping there was a clearly larger potentiation of the MG activity in the adults, particularly in the eccentric phase. On the other hand, there were striking similarities between boqs and adults aith respect to the degree of pre‐activation of both muscles during the different hopping regimes as Hell as potentiation of muscle activity during the concentric phase ot maximal height hopping. Thus, sonic aspects of the selectivc ncural control of the ankle extenson muscles appear to be manifested in pre‐pubertal boys. However, the data also indicate that other factors, such as utilization of stored elastic energy in the muscles and stretch reflex potentiation, will still continue to develop from the age of nine.