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Article

Within-Subject Consistency of Unimodal and Bimodal Force Application during the Countermovement Jump

1
Chichester Institute of Sport, University of Chichester, Chichester, West Sussex PO19 6PE, UK
2
Directorate of Sport, Exercise and Physiotherapy, University of Salford, Frederick Road, Salford M6 6PU, UK
*
Author to whom correspondence should be addressed.
Sports 2018, 6(4), 143; https://doi.org/10.3390/sports6040143
Received: 30 September 2018 / Revised: 2 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
Countermovement jump (CMJ) force data are often time-normalized so researchers and practitioners can study the effect that sex, training status, and training intervention have on CMJ strategy: the so-called force–time curve shape. Data are often collected on an individual basis and then averaged across interest-groups. However, little is known about the agreement of the CMJ force–time curve shape within-subject, and this formed the aim of this study. Fifteen men performed 10 CMJs on in-ground force plates. The resulting force–time curves were plotted, with their shape categorized as exhibiting either a single peak (unimodal) or a double peak (bimodal). Percentage-agreement and the kappa-coefficient were used to assess within-subject agreement. Over two and three trials, 13% demonstrated a unimodal shape, 67% exhibited a bimodal shape, and 20% were inconsistent. When five trials were considered, the unimodal shape was not demonstrated consistently; 67% demonstrated a bimodal shape, and 33% were inconsistent. Over 10 trials, none demonstrated a unimodal shape, 60% demonstrated a bimodal shape, and 40% were inconsistent. The results of this study suggest that researchers and practitioners should ensure within-subject consistency before group averaging CMJ force–time data, to avoid errors. View Full-Text
Keywords: jump strategy; force platform; jump monitoring; temporal phase analysis jump strategy; force platform; jump monitoring; temporal phase analysis
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MDPI and ACS Style

Lake, J.P.; McMahon, J.J. Within-Subject Consistency of Unimodal and Bimodal Force Application during the Countermovement Jump. Sports 2018, 6, 143. https://doi.org/10.3390/sports6040143

AMA Style

Lake JP, McMahon JJ. Within-Subject Consistency of Unimodal and Bimodal Force Application during the Countermovement Jump. Sports. 2018; 6(4):143. https://doi.org/10.3390/sports6040143

Chicago/Turabian Style

Lake, Jason P., and John J. McMahon 2018. "Within-Subject Consistency of Unimodal and Bimodal Force Application during the Countermovement Jump" Sports 6, no. 4: 143. https://doi.org/10.3390/sports6040143

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