Department of Kinesiology, Recreation and Sport
Master of Science of Physical Education
Thirty-one trained male subjects performed one-repetition maximum lifts (IRM's) on three Hammer Strength Externally Loaded Machines and three comparable Free Weight Exercises. All tests were counterbalanced and randomly assigned. Subjects performed two 1RM tests during each lab session, with at least 48-72 hours of recovery between each. IRM's were recorded as the greatest amount of weight lifted with proper technique. 1RM data was used to (1) determine the relationship between 1RM performed on Hammer Strength machines versus Free Weights and (2) to develop regression equations that can accurately predict IRM's when switching from one exercise modality to another. Statistics revealed significant differences (p<0.05) between IRM's performed on the Hammer Strength equipment as compared to its counterpart free weight exercise. For all exercises, IRM's were significantly greater/higher on Hammer Strength equipment. Regression equations were developed for all exercises, except when predicting the Hammer Strength shoulder press and the Hammer Strength Preacher Curls from their free weight counterparts, where no variables existed that could significantly predict their respective IRM's.
Thoma, Matthew, "Hammer Strength vs. Free Weights: Upper Body 1 RM Comparisons" (2006). Masters Theses & Specialist Projects. Paper 299.