## Q points: Scaling model of Olympic-style weightlifting performances to account for body mass ------------------------------------------------------------------------ - Project Status: CLOSED - Collaborators: Marianne Huebner, David E. Meltzer, Ásgeir Bjarnason, Aris Perperoglou ---------- #### DESCRIPTION Q-points = a scaling model to compare performances by weightlifters of different body mass Performance = total weight lifted measured by the sum of the best snatch (of three attempts) and the best clean and jerk (of three attempts) ---------- #### Model The formula for Q-points used quantile regression models (hence "Q") to scale the total T based on a function of body weight B: $$ \mbox{Q-points} = T \frac{Tmax}{f(B)}$$ where $$f(B) = \beta_0+ \beta_1 (B/100)^{-2} + \beta_2 (B/100)^2$$ There are separate formulas for men and women. ---------- #### Code - Web application: [https://huebner.shinyapps.io/Qpointsapp/][1] - Formulas that can be used on an Excel spreadsheet for competitions: qpoints_Excelformula.txt - R code that can be used for updating the formulas with new data: qpoints_Rcode.R ---------- #### Reference Huebner M, Meltzer D, Bjarnason A, Perperoglou A. Comparison of Olympic-style weightlifting performances of elite athletes: scaling models account for body mass. Med Sci Sports Exerc. Dec 2023 DOI: 10.1249/MSS.0000000000003252. (Published ahead of print: [Link][3] July 7, 2023) ---------- #### Data For the 2023 Q-point formula data from Olympics and World and Continental Championships from 2017 to 2021 were used. [https://iwf.sport/results/][2] Results from athletes with doping violations were excluded, resulting in performances from 1,900 athletes from 150 countries for use in analysis. See Files: 'STROBE diagram.pdf' ---------- #### Related References Perperoglou A, Huebner M. Quantile foliation for modeling performance across body mass and life span in Olympic weightlifting. Statistical Modelling. 2020 (Aug). https://journals.sagepub.com/doi/full/10.1177/1471082X20940156. Preprint on Research Gate Huebner M, Meltzer D, Perperoglou A. Age-associated Performance Decline and Sex Differences in Olympic Weightlifting. Med Sci Sports Exerc. 2019 Nov;51(11):2302–8. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7028478/ Huebner M, Perperoglou A. Performance Development From Youth to Senior and Age of Peak Performance in Olympic Weightlifting. Front Physiol. 2019; 1121. https://www.frontiersin.org/articles/10.3389/fphys.2019.01121/full Huebner M, Perperoglou A. Sex differences and impact of body mass on performance from childhood to senior athletes in Olympic weightlifting. PLoS One 2020 (Sep); https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0238369 [1]: https://huebner.shinyapps.io/Qpointsapp/. [2]: https://iwf.sport/results/ [3]: https://journals.lww.com/acsm-msse/Abstract/9900/Comparison_of_Olympic_Style_Weightlifting.321.aspx