JPD plots from a single animal throughout the 6 hours with and without eEmc. (A) Joint probability distribution plots showing the relationship between the soleus and TA activity expressed in 10-min bins during the 6-hr recording period for a representative spinal rat. The 6-hr recording occurred during the dark period (8:00 pm to 2:00 am), i.e., the active period of the rats. (B) The incidence of occurrence of different joint probability distributions for 10 min of activity without (I) and with (II) eEmc. The asterisks in (A) identify the two bins being compared in (B), without eEmc (I) and with eEmc (II). Note the lack of consistent alternating flexor-extensor activation without compared to with eEmc.