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• W2017364869 abstract "There has been considerable debate concerning the optimal load for power output during the jump squat exercise. While most of the research has examined smith machine jump squats, few have examined free standing jump squats which may have more carryover to actual sport tasks. While a linear position transducer (LPT) is appropriate for measuring displacement during smith machine jump squats, this device has not been validated for free-standing jump squats. PURPOSE To determine the validity of a combination LPT/force platform method as compared to a 2D video/force platform method for measuring power output during jump squats. METHODS Seventeen college age males were instructed to dip to a self-selected depth and then jump as high as possible for 7 loading conditions ranging from 0% to 60% of a predicted 1 repetition maximum (RM) squat lift. Power values were obtained for both the LPT and 2D methods and compared using a multivariate analysis of variance (MANOVA). Confidence intervals were used to determine the proportion that the two methods were in agreement on the optimal load. Adjacent loads within each method were also tested for significant difference using a univariate analysis of variance (ANOVA) with a Tukey's B post-hoc test. RESULTS The LPT method produced significantly lower power values than the 2D method. The MANOVA showed the average optimal load for the LPT method at 0% load, while the average optimal load for the VA method occurred at 10% load. Confidence intervals (CI) revealed that the proportion of participants with the same optimal load between the two methods would fall between 35.5% and 82.1%. The actual proportion in agreement was 58.8%. The ANOVA revealed no significant difference between any of the loads for the LPT method per person, whereas the 2D method had no significant difference between the optimal load and the next highest load per person. All tests were conducted at a .05 level of significance. CONCLUSIONS While an LPT is appropriate for smith machine jump squats where the movement is constrained to vertical displacement, it is unable to distinguish between the vertical and horizontal displacement which occur during free standing jump squats. Error due to this is then compounded as displacement is differentiated to velocity and then combined with force to provide power output. The LPT does not appear to be a valid testing device for measuring power output during free standing jump squats." @default.
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• W2017364869 date "2005-05-01" @default.
• W2017364869 modified "2023-09-26" @default.
• W2017364869 title "Linear Position Transducer / Force Platform Method For Determining Power Output During Free-standing Jump Squats" @default.
• W2017364869 doi "https://doi.org/10.1097/00005768-200505001-02113" @default.
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