Concurrent validity of a portable force plate using vertical jump force–time characteristics
Deutscher übersetzter Titel: | Ermittlung der konkurrenten Validität einer tragbaren Kraftmessplatte durch Kraft-Zeit-Merkmale beim Vertikalsprung |
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Autor: | Lake, Jason P.; Mundy, Peter; Comfort, Paul; McMahon, John J.; Suchomel, Timothy J.; Carden, Patrick |
Erschienen in: | Journal of applied biomechanics |
Veröffentlicht: | 34 (2018), 5, S. 410-413, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1065-8483, 1543-2688 |
DOI: | 10.1123/jab.2017-0371 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201905003426 |
Quelle: | BISp |
Abstract des Autors
This study examined concurrent validity of countermovement vertical jump reactive strength index modified and force–time characteristics recorded using a 1-dimensional portable and laboratory force plate system. Twenty-eight men performed bilateral countermovement vertical jumps on 2 portable force plates placed on top of 2 in-ground force plates, both recording vertical ground reaction force at 1000 Hz. Time to takeoff; jump height; reactive strength index modified; and braking and propulsion impulse, mean net force, and duration were calculated from the vertical force from both force plate systems. Results from both systems were highly correlated (r ≥ .99). There were small (d < 0.12) but significant differences between their respective braking impulse, braking mean net force, propulsion impulse, and propulsion mean net force (P < .001). However, limits of agreement yielded a mean value of 1.7% relative to the laboratory force plate system (95% confidence limits, 0.9%–2.5%), indicating very good agreement across all of the dependent variables. The largest limits of agreement were for jump height (2.1%), time to takeoff (3.4%), and reactive strength index modified (3.8%). The portable force plate system provides a valid method of obtaining reactive strength measures, and several underpinning force–time variables, from unloaded countermovement vertical jump. Thus, practitioners can use both force plates interchangeably.