Fig. 6

Associations. a Greater MVC torque of trunk flexor muscles was associated with larger lean mass in the trunk (r = 0.378, p = 0.011). b Longer-time-to-task failure during an intermittent isometric trunk flexion fatiguing exercise task was associated with greater MVC torque of trunk flexor muscles (r = 0.473, p = 0.005). c Longer-time-to-task failure of the trunk flexor muscles was associated with self-reported physical activity levels over the preceding year (r = 0.456, p = 0.030). d Greater self-reported physical activity levels over the preceding year were associated with greater lean mass in the trunk (r = 0.486, p = 0.007)