Validity of a linear velocity transducer for testing maximum vertical jumps
(Gültigkeit eines linearen Geschwindigkeitsmessumformers zur Prüfung von maximalen vertikalen Sprüngen)
This study aimed to examine the validity of mechanical variables obtained by a linear velocity transducer from the unconstrained and constrained squat jump (SJ). Twenty-three men were tested on the unconstrained SJ and the SJ constrained by a Smith machine. Maximum values of force, velocity, and power were simultaneously recorded both by a linear velocity transducer attached to a bar of mass of 17, 30, 45, 60, and 75 kg and by a force plate. Linear velocity transducer generally overestimated the outcomes measured as compared to the force plate, particularly in unconstrained SJ. Bland-Altman plots revealed that heteroscedasticity of errors was mainly observed for velocity variables (r 2?=.26-.58) where the differences were negatively associated with the load magnitude. However, exceptionally high correlations were observed between the same outcomes recorded with the 2 methods in both unconstrained (median r=.89 [.71-.95]) and constrained SJ (r=.90 [.65-.95]). Although the systematic and proportional bias needs to be acknowledged, the high correlations between the variables obtained by 2 methods suggest that the linear velocity transducer could provide valid values of the force, velocity, and power outputs from both unconstrained and constrained SJ.
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Schlagworte: | Biomechanik Messverfahren Gütekriterien Geschwindigkeit Sprung maximal Test |
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Notationen: | Naturwissenschaften und Technik Trainingswissenschaft |
DOI: | 10.1123/jab.2016-0142 |
Veröffentlicht in: | Journal of Applied Biomechanics |
Veröffentlicht: |
2017
|
Jahrgang: | 33 |
Heft: | 5 |
Seiten: | 388-392 |
Dokumentenarten: | elektronische Zeitschrift |
Sprache: | Englisch |
Level: | hoch |