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Assessing reactive strength measures in jumping and hopping using the Optojump (TM) system

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dc.contributor.author Healy, Robin
dc.contributor.author Kenny, Ian C.
dc.contributor.author Harrison, Andrew J.
dc.date.accessioned 2017-02-28T12:03:24Z
dc.date.available 2017-02-28T12:03:24Z
dc.date.issued 2016
dc.identifier.uri http://hdl.handle.net/10344/5568
dc.description peer-reviewed en_US
dc.description.abstract The aim of this study was to assess the concurrent validity of the OptojumpTM system (Microgate, Bolzano, Italy) versus a force platform in the estimation of temporal and reactive strength measures. In two separate investigations, twenty physically active males performed double-leg and single-leg drop jumps from a box height of 0.3 m and a 10 s vertical bilateral hopping test. Contact time, flight time and total time (the sum of contact and flight time) were concurrently assessed during single and double-leg drop jumps and during hopping. Jump height, the reactive strength index and the reactive strength ratio were also calculated from contact time and flight time. Despite intraclass correlation coefficients (ICCs) for all variables being close to 1 (ICC > 0.975), a significant overestimation was found in contact time (0.005 +/- 0.002 s) and underestimations in flight time (0.005 +/- 0.003 s), the reactive strength index (0.04 +/- 0.02 m center dot s(-1)) and the reactive strength ratio (0.07 +/- 0.04). Overestimations in contact time and underestimations in flight time were attributed to the physical design of the OptojumpTM system as the transmitter and receiver units were positioned 0.003 m above the floor level. The OptojumpTM demonstrated excellent overall temporal validity with no differences found between systems for total time. Coaches are advised to be consistent with the instrumentation used to assess athletes, however, in the case of comparison between reactive strength values collected with the OptojumpTM and values collected with a force platform, regression equations are provided. en_US
dc.language.iso eng en_US
dc.publisher De Gruyter Open en_US
dc.relation.ispartofseries Journal of Human Kinetics;54 , pp. 23-32
dc.relation.uri http://dx.doi.org/10.1515/hukin-2016-0032
dc.subject force platform en_US
dc.subject drop jump en_US
dc.subject jump height en_US
dc.subject contact time en_US
dc.subject validity en_US
dc.subject photoelectric cells en_US
dc.title Assessing reactive strength measures in jumping and hopping using the Optojump (TM) system en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.date.updated 2017-02-28T11:49:18Z
dc.description.version PUBLISHED
dc.identifier.doi 10.1515/hukin-2016-0032
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2698438
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Journal Of Human Kinetics
dc.description.status peer-reviewed


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