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Relationships Between Eccentric and Concentric Knee Strength Capacities and Maximal Linear Deceleration Ability in Male Academy Soccer Players

Harper, Damian J.1,2; Jordan, Alastair R.1; Kiely, John2

The Journal of Strength & Conditioning Research: July 09, 2018 - Volume Publish Ahead of Print - Issue - p
doi: 10.1519/JSC.0000000000002739
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Harper, DJ, Jordan, AR, and Kiely, J. Relationships between eccentric and concentric knee strength capacities and maximal linear deceleration ability in male academy soccer players. J Strength Cond Res XX(X): 000–000, 2018—The purpose of this study was to investigate the relationships between maximal linear deceleration ability, and knee flexor (KF) and knee extensor (KE) strength. Fourteen male academy soccer players completed a 30-m linear sprint, a maximal linear deceleration test, and eccentric and concentric KF and KE contractions in both dominant leg (DL) and nondominant leg (NDL) at slower (60°·s−1) and faster (180°·s−1) angular velocities on an isokinetic dynamometer. Maximal linear deceleration ability was evaluated using distance-to-stop (DEC-DTS) and time-to-stop (DEC-TTS), with isokinetic peak torque representing KF and KE strength capacity. Relationships were established using Pearson's correlation coefficients (r) with magnitude-based inferences used to describe the uncertainty in the correlation. Both concentric KE and KF strength at 180°·s−1 in the NDL had the highest correlations with deceleration ability (r = −0.76 and r = −0.78, respectively). In the DL, concentric KE and KF strength at 180°·s−1 also had very likely large correlations with deceleration ability (r = −0.54 and −0.55, respectively). All correlations between eccentric KF strength and deceleration ability were unclear. At 180°·s−1, correlations between eccentric KE strength and deceleration ability were also unclear; however, at 60°·s−1, both DL (r = −0.63 to −0.64) and NDL (r = −0.54 to −0.55) had very likely large correlations with deceleration ability. These findings provide novel insights into the unilateral KF and KE strength capacities underpinning the ability to decelerate rapidly from high-sprint velocities.

1School of Sport, York St John University, York, United Kingdom; and

2Institute of Coaching and Performance, School of Sport and Wellbeing, University of Central Lancashire, Preston, United Kingdom

Address correspondence to Damian J. Harper, d.harper@yorksj.ac.uk.

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