Cormie, P., R. Deane, and J.M. McBride. Methodo-logical concerns for determining power output in the jump squat. J. Strength Cond. Res. 21(2):424–430. 2007.—The purpose of this study was to investigate the validity of power measurement techniques during the jump squat (JS) utilizing various combi-nations of a force plate and linear position transducer (LPT) de-vices. Nine men with at least 6 months of prior resistance train-ing experience participated in this acute investigation. One rep-etition maximums (1RM) in the squat were determined, followed by JS testing under 2 loading conditions (30% of 1RM [JS30] and 90% of 1RM [JS90]). Three different techniques were used simultaneously in data collection: (a) 1 linear position transduc-er (1-LPT); (b) 1 linear position transducer and a force plate (1-LPT ϩ FP); and (c) 2 linear position transducers and a force place (2-LPT ϩ FP). Vertical velocity-, force-, and power-time curves were calculated for each lift using these methodologies and were compared. Peak force and peak power were overesti-mated by 1-LPT in both JS30 and JS90 compared with 2-LPT ϩ FP and 1-LPT ϩ FP (p Յ 0.05). Peak power determined by 2-LPT ϩ FP was significantly higher than that determined by 1-LPT ϩ FP under the JS90 loading condition. Peak vertical velocity determined by 2-LPT ϩ FP was significantly lower than that determined by either 1-LPT and 1-LPT ϩ FP in JS90. This investigation indicates that peak power and the timing of power output in the jump squat varies according to the measurement technique utilized. The 1-LPT methodology is not a valid means of determining power output in the jump squat. Furthermore, the 1-LPT ϩ FP method may not accurately represent power output in free weight movements that involve a significant amount of horizontal motion.
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