Fig. 4

Construct validity of stretch reflexes: the three neurophysciological criteria for stretch reflexes are shown (row 1–5), as well as the clinical criteria (row 6, 7). (1) The mechanical response for the ankle and knee joint; and (2, 3) of the gastrocnemius medialis (GM), soleus (SO) and tibialis anterior (TA) muscle; (4) the electrophysiological response for the GM, SO and TA; (5) the amount of co-contraction; (6) muscular response strength; and (7) response duration. Bar graphs indicate mean and standard error of the mean values. Values are presented for unperturbed (unp) and perturbation intensity (Intens) 1–3. For the clinical criteria, only I1-3 are shown. Values for the selective dorsal rhizotomy (SDR) group are only presented for clinical criteria. MTL muscle tendon lengthening, MTV muscle tendon velocity, CCI co-contraction index; norm normalized