Bone mineral density is known to take a long time to change (improve) so it's not surprising that no improvement was shown at the lumbar region after 12 weeks in any of the groups. Therefore I found it surprising that by the end of 6 months, there was statistically significant improvement at the lumbar region after 24 weeks in the exercise + fish oil group. Most surprising of all, the authors found statistically significant improvement at the femoral neck at both 12 and 24 weeks in this same group. Compared to controls, those randomized to either exercise or supplements demonstrated intermediate improvements in bone mineral density at the femoral neck such that exercise and fish oil appear to be synergistic.
Today's take home point? The combination of exercise and fish oil is good for your bones (and heart). But you knew that already, didn't you?