Fig. 8. Sample raw EMG traces from a 21.6kg dog trotting at 2.4ms^-1 while carrying 3.2kg (15% of body mass) in saddle bags on its back. Both traces are from the same electrode, implanted in the left longissimus dorsi muscle at the lumbar site. The accelerometer recordings are from an accelerometer positioned to record vertical accelerations at mid-trunk. (A) Data from a trial in which half the added mass was carried over the pectoral girdle and the other half was carried over the pelvic girdle. (B) Data from a trial in which all of the added mass was carried mid-trunk.