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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Spine J. 2014 Oct 29;15(4):596–606. doi: 10.1016/j.spinee.2014.10.020

Figure 1.

Figure 1

Experimental tasks and variables. A) Supported leg raise task (SLR); B) Unsupported leg raise task (ULR), and; C) Schematic of the vertical ground reaction forces under the feet (Fz) as well as representative EMG from a subject without LBP. The graphs of representative EMG illustrate the task dependence and temporal characteristics of EMG burst activity for muscles of the leg: from top to bottom, the left long-head of biceps femoris (BFM), the left rectus femoris (RFM), the right BFM, and the right RFM. Black traces represent responses during the ULR task; gray traces represent responses during the SLR task. Time 0 represents movement onset. The dashed black vertical line indicates the movement onset.