Intra- and inter-day reliability of weightlifting variables and correlation to performance during cleans

Sorensen, Angela, Chavda, Shyam, Comfort, Paul, Lake, Jason P. and Turner, Anthony (2022) Intra- and inter-day reliability of weightlifting variables and correlation to performance during cleans. Journal of Strength and Conditioning Research. ISSN 1064-8011 (In Press)

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Abstract

The purpose of this investigation was to examine intra- and inter-day reliability of kinetic and kinematic variables assessed during the clean, assess their relationship to clean performance, and determine their suitability in weightlifting performance analysis. Eight competitive weightlifters performed 3 sets of single repetition cleans with 90% of their one-repetition maximum. Force-time data were collected via dual force plates with displacement-time data collected via 3-dimensional motion capture, on three separate occasions under the same testing conditions. Seventy kinetic and kinematic variables were analyzed for intra- and inter-day reliability using intraclass correlation coefficients (ICC) and the coefficient of variation (CV). Pearson’s correlation coefficients were calculated to determine relationships between barbell and body kinematics and ground reaction forces and for correlations to be deemed as statistically significant, an alpha-level of p ≤ 0.005 was set. Eleven variables were found to have ‘good’ to ‘excellent’ intra- and inter-day ICC (0.779-0.994 and 0.974-0.996, respectively) and CV (0.64-6.89% and 1.14-6.37%, respectively), with strong correlations (r = 0.880-0.988) to cleans performed at 90% 1RM. Average resultant force of the weighting 1 (W1) phase demonstrated the best intra- and inter-day reliability (ICC = 0.994 and 0.996 respectively), and very strong correlation (r = 0.981) to clean performance. Average bar power from point of lift off to peak bar height exhibited the highest correlation (r = 0.988) to clean performance. Additional reliable variables with strong correlations to clean performance were found, many of these occurred during or included the W1 phase, which suggests coaches should pay particular attention to the performance of the W1 phase.

Item Type: Article
Additional Information: Copyright © 2022 National Strength and Conditioning Association.
Subjects: Q Science > QM Human anatomy
Q Science > QP Physiology
Divisions: Academic Areas > Institute of Sport > Area > Exercise Physiology
Related URLs:
Depositing User: Jason Lake
Date Deposited: 27 Jan 2022 14:38
Last Modified: 11 May 2022 15:26
URI: https://eprints.chi.ac.uk/id/eprint/6114

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