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Sports 2018, 6(2), 36; https://doi.org/10.3390/sports6020036

Is a Bimodal Force-Time Curve Related to Countermovement Jump Performance?

1
School of Sport, Ulster University, Jordanstown, Shore Road, Newtownabbey, County Antrim BT37 0QB, UK
2
Ulster Rugby, Kingspan Stadium, Belfast BT6 0FT, UK
*
Author to whom correspondence should be addressed.
Received: 12 March 2018 / Revised: 13 April 2018 / Accepted: 16 April 2018 / Published: 18 April 2018
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Abstract

A countermovement jump (CMJ) represents one of the most frequently used performance tests for monitoring neuromuscular function in athletes. An often-overlooked feature that may provide some useful diagnostic information is the actual shape of the force-time curve. The aim of this study was therefore to consider how the shape of the force-time curve influences jump performance. Thirty-three male rugby union players performed two CMJs on a force plate, with discrete variables and continuous curve analysis used. The subjects were dichotomized based on shape of the force-time curve during the propulsion phase and by jump height. The differences between the unimodal and bimodal groups were unclear for jump height (ES = 0.28, ±0.58) and reactive strength index-modified (ES = −0.30, ±0.59). A substantial difference between high (40.2 ± 2.9 cm) and low (31.2 ± 3.2 cm) jumpers only existed in the late propulsion phase by 79.0% to 97.0% of the normalized force-time curve. A bimodal force-time curve is not representative of an optimal pattern of performance and simply reflects an inefficient stretch-shortening cycle. The inter-individual variability that exists in braking COM displacement renders temporal phase analysis impractical in cross-sectional type studies. View Full-Text
Keywords: movement; attention; neuromuscular function; shape movement; attention; neuromuscular function; shape
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Kennedy, R.A.; Drake, D. Is a Bimodal Force-Time Curve Related to Countermovement Jump Performance? Sports 2018, 6, 36.

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