1. Figure 2: Muscle activity (% of maximal extension strength test) of the spinal erector muscles performing the core stability (light grey) and back endurance test. The muscle activity performing the endurance test was divided in four similar time periods (0-25, 26-50, and % of time from start to exhaustion).
* indicates significant lower muscle activity between the core stability and core endurance test on a p < 0.05 level.
† indicates significant difference between these two time periods on a p ≤ 0.05 level.