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The Effect of Various Body Positions on Performance of the Isometric Mid-Thigh Pull

While the isometric mid-thigh pull (IMTP) has been used often in the literature, the effects of familiarization on kinetic variables of the pull has not been determined. We measured performance of two positions of the IMTP over 5 days of familiarization and testing. Subjects were drawn from two populations, experience with weightlifting derivatives (>6 months of regular use) and little experience with weightlifting derivatives (<3 months of use). Peak force, force at 90ms, force at 250ms, and impulse 0-250ms were compared used multiple mixed-design ANOVAs. The effect of familiarization was not statistically significant as a main effect or as part of an interaction effect. This indicates that only small amounts of familiarization (the warmups used prior to the first pull (2 repetitions of 50% effort, 2 repetitions of 75% effort) were sufficient for familiarizing subjects both experienced and inexperienced with weightlifting derivatives.