0.05). It seems that the immediate effects of cold spray on the muscles activity were not severe and long-term effects were very low. In addition, since co-contraction depends on the motor control of nervous system, probably cryotherapy effects used in this study was limited to the muscles and motor program of the central nervous system has not altered. Also, it is likely that as a result of decreasing conduction velocity in muscle tissue in the concentric phase, more motor units are recruited as a compensatory mechanism. Future studies are needed to identify other changes following cryotherapy.]]>