TY - JOUR AU - Rago, Vincenzo A2 - Rago, Vincenzo A2 - Brito, João A2 - Figueiredo, Pedro A2 - Carvalho, Thiago A2 - Fernandes, Tiago A2 - Fonseca, Pedro A2 - Rebelo, António DB - BISp DP - BISp KW - Bewegungsanalyse KW - Kraftmessplatte KW - Leistungsdiagnostik KW - Messtechnik KW - Messverfahren KW - Neuromotorik KW - Reliabilität KW - Sportmotorik KW - Sporttechnologie KW - Sprungkraft KW - Testverfahren KW - Untersuchung, empirische KW - Validität LA - eng TI - Countermovement jump analysis using different portable devices : implications for field testing TT - Counter Movement Jump mit unterschiedlichen tragbaren Messgeräten : Implikationen für Feldtests PY - 2018 N2 - The aim of this study was to analyze the concurrent validity, test–retest reliability, and capacity to detect changes of four different portable devices used to measure a wide range of neuromuscular parameters derived from countermovement jump (CMJ). An accelerometric device (Myotest), a jump mat (Ergojump), an optical device (Optojump), and a smartphone app (MyJump) were simultaneously examined for concurrent validity against gold-standard measures (motion-capture system and a force platform). Twenty-two CMJ-derived variables were collected from 15 healthy male subjects (n = 60 CMJs). Contraction time (CT) and eccentric duration (EccD) measurements obtained from the Myotest were moderately to largely associated with and not different from force platform measurements (r = 0.31 to 0.64, ES = 0.11 to 0.18) and showed moderate test-retest reliability (intraclass correlation coefficient (ICC) = 0.92 to 0.97, coefficient of variation (CV) = 3.8 to 8.0%). Flight time (FT) and jump height (JH) from Ergojump, Optojump, and MyJump showed moderate to strong associations with gold-standard measurements (r = 0.57 to 0.98) and good test–retest reliability (ICC = 0.54 to 0.97, CV = 1.8 to 4.2). However, all portable devices underestimated JH (ES = 1.25 to 2.75). Independent of the instrument used, the analyzed CMJ variables showed good capacity to detect changes (standard error of measurement (SEM) < smallest worthwhile change (SWC)), with the exception of rate of force and rate of power development parameters, which showed marginal capacity (SEM > SWC). The Myotest is preferable to measure temporal parameters during ground contact, whereas Ergojump, Optojump, and MyJump devices may be preferable to measure FT and JH, with the Optojump being the most accurate. L2 - https://www.mdpi.com/2075-4663/6/3/91/htm L2 - https://dx.doi.org/10.3390/sports6030091 L2 - https://www.mdpi.com/2075-4663/6/3/91/pdf DO - 10.3390/sports6030091 SP - Art.-ID 91, [15 S.] SN - 2075-4663 JO - Sports IS - 3 VL - 6 M3 - Elektronische Ressource (online) ID - PU201902001256 ER -