Randomized trial comparing the effects of one set vs two sets of resistance exercises for patients with cLBP.

Limke JC, Eur J Phys Rehab Med. Dec;44 2008.

This interesting study at the New England Baptist bone and joint institute in Boston investigated the efficacy of its (2) set progressive resistance (PRE) program used to reverse deconditioning vs just (1) set. They were investigating whether completing (1) vs. (2) sets of resistance exercise during an otherwise identical spine rehab program would prove additional benefits from the additional set. There were 100 subjects with a mean age of 46. The measures included back strength and progressive iso-inertial lifting evaluation (PILE) at discharge from the program. Exercises consisted of Cybex back extension, rotary torso, pull downs, various hip and leg exercises as well as lifting crates. A (4) rep max as well as the PILE measures were the outcome measures.

Results: at discharge there was NO significant difference in strength, disability or pain measures between subjects completing (1) vs. (2) sets.

Conclusions:  These findings suggest that there is NO added benefits for completing a second set for patients with cLBP.