Reliability of performance measurements derived from ground reaction force data during countermovement jump and the influence of sampling frequency

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Bibliographic Details
Title translated into German:Reliabilität von Leistungsmessungen als Ableitung von Bodenreaktionskraftdaten während des Countermovement-Sprungs und der Einfluss der Sampling-Frequenz
Author:Hori, Naruhiro; Newton, Robert U.; Kawamori, Naoki; McGuigan, Michael R.; Kraemer, William J.; Nosaka, Kazunori
Published in:Journal of strength and conditioning research
Published:23 (2009), 3, S. 874-882, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Language:English
ISSN:1064-8011, 1533-4287
Keywords:
Online Access:
Identification number:PU201001000437
Source:BISp

Abstract

Force platforms are used extensively to measure force and power output during countermovement jump (CMJ). The purpose of this study was to examine measurement reliability and validity of commonly used performance measurements derived from ground reaction force (GRF)-time data during CMJ and the influence of sampling at different frequencies. Twenty-four men performed 2 trials of CMJ on a force platform, and GRF-time data were sampled at a rate of 500 Hz. Data obtained at 500 Hz were considered as the reference, and then data were resampled at 400, 250, 200, 100, 50, and 25 Hz, using interpolation. Commonly used power, force, and velocity performance measures were obtained from GRF-time data. Reliability was assessed by intraclass correlation coefficient (ICC) and coefficient of variation (CV) between the 2 trials within the session. Peak power, peak force, and peak velocity were highly reliable across all sampling frequencies (ICC = 0.92-0.98, CV = 1.3-4.1). Percentage differences from 500-Hz reference values ranged from -0.85 to 0.20% at 400 Hz, -1.88 to 0.89% at 250 Hz, -1.80 to 1.31% at 200 Hz, -3.63 to 3.34% at 100 Hz, -11.37 to 6.51% at 50 Hz, and -13.17 to 9.03% at 25 Hz. In conclusion, peak power, force, and velocity measurements derived from GRF to assess leg extensor capabilities are reliable within a test session except for peak rate of force development and time to peak power. With regard to sampling frequency, scientists and practitioners may consider sampling as low as 200 Hz, depending on the purpose of measurement, because the percentage difference is not markedly enlarged until the frequency is 100 Hz or lower. Verf.-Referat