Pooled Versus Individualized Load–Velocity Profiling in the Free-Weight Back Squat and Power Clean

THOMPSON, Steve W, ROGERSON, David, RUDDOCK, Alan, BANYARD, Harry G and BARNES, Andrew (2021). Pooled Versus Individualized Load–Velocity Profiling in the Free-Weight Back Squat and Power Clean. International Journal of Sports Physiology and Performance.

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Link to published version:: https://doi.org/10.1123/ijspp.2020-0534
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    Abstract

    Purpose: This study compared pooled against individualized load–velocity profiles (LVPs) in the free-weight back squat and power clean. Methods: A total of 10 competitive weightlifters completed baseline 1-repetition maximum assessments in the back squat and power clean. Three incremental LVPs were completed, separated by 48 to 72 hours. Mean and peak velocity were measured via a linear-position transducer (GymAware). Linear and nonlinear (second-order polynomial) regression models were applied to all pooled and individualized LVP data. A combination of coefficient of variation (CV), intraclass correlation coefficient, typical error of measurement, and limits of agreement assessed between-subject variability and within-subject reliability. Acceptable reliability was defined a priori as intraclass correlation coefficient > .7 and CV < 10%. Results: Very high to practically perfect inverse relationships were evident in the back squat (r = .83–.96) and power clean (r = .83–.89) for both regression models; however, stronger correlations were observed in the individualized LVPs for both exercises (r = .85–.99). Between-subject variability was moderate to large across all relative loads in the back squat (CV = 8.2%–27.8%) but smaller in the power clean (CV = 4.6%–8.5%). The power clean met our criteria for acceptable reliability across all relative loads; however, the back squat revealed large CVs in loads ≥90% of 1-repetition maximum (13.1%–20.5%). Conclusions: Evidently, load– velocity characteristics are highly individualized, with acceptable levels of reliability observed in the power clean but not in the back squat (≥90% of 1-repetition maximum). If practitioners want to adopt load–velocity profiling as part of their testing and monitoring procedures, an individualized LVP should be utilized over pooled LVPs.

    Item Type: Article
    Additional Information: Published online date found in hidden metadata - right click and view page source
    Uncontrolled Keywords: Sport Sciences; 1106 Human Movement and Sports Sciences; 1116 Medical Physiology; 1701 Psychology
    Identification Number: https://doi.org/10.1123/ijspp.2020-0534
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 10 Feb 2021 16:00
    Last Modified: 17 Mar 2021 13:45
    URI: http://shura.shu.ac.uk/id/eprint/28128

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