Most experts have long held that partial repetitions provide no benefit to the serious weightlifter. This was not the finding of a study done at the University of Southern Mississippi compared using partial range of motion (ROM) repetitions and full ROM repetitions in the development of strength in untrained males. As far as the development of maximal strength was concerned, partial and mixed repetitions were found to be equally as effective as full repetitions.

This study was conducted over 10 weeks and used the bench press as criterion for measurement. Fifty six subjects were divided into three groups: the first group used three full ROM sets; the second group used three partial ROM sets; the third group used a combination. The researchers found no differences between the three groups. However, they do point out that this study does suggest partial reps can be a benefit to a person?s maximal strength. (J strength Cond Res 18(3), 518-521, 2004)

Does this mean partial reps should be the major component of a strength training routine? Absolutely not. As with all studies concerning progressive resistance training, there were too few subjects, and the length of time involved was too short in duration. However, this study does find support in using partial reps in addition to a traditional strength training program. This is especially true for power lifters and other athletes who need to ?lock a weight out? at the top portion of the lift.