My coach says: The effects of accelerated eccentric and landing cues to elicit change in countermovement jump propulsive and landing performance
Document Type
Journal Article
Publication Title
Journal of Strength and Conditioning Research
Volume
39
Issue
6
First Page
e730
Last Page
e741
Publisher
National Strength and Conditioning Association
School
School of Medical and Health Sciences
Abstract
The aim of the study was to determine if an accelerated eccentric (AE) cue during a countermovement jump (CMJ) produces distinct kinetic outputs. Eighteen strength-trained men (mean ± SD: Age = 25.9 ± 4.5 years; body mass = 87.1 ± 12.2 kg; stature = 181.7 ± 6.2 cm) completed a jump cue ("jump as high and fast as possible") (NORM) or AE ("fast downward, max braking, and jump as high and fast as possible") with 2 types of landing cues: Deceleration eccentric (DC) ("decelerate as fast as possible once landed") and dissipating eccentric (DP) ("stop in your own time"). The Hawkin Dynamics Cloud system was used for jump analysis, including additional landing metrics. Subjects performed 4 repetitions of AEDC landling, AEDP landling, NORMDC landling, and NORMDP landling in a randomized order on 2 separate occasions. When compared with the NORM conditions, the AE conditions had significantly greater peak and mean braking velocity (effect size [ES] = -0.77 to -0.89 and -0.60 to -0.83, respectively), mean braking power (ES = -0.56 to -0.59), mean braking force (ES = 0.40-0.46), braking impulse (ES = 0.35-0.41), force at minimal displacement (ES = 0.26-0.32), and peak propulsion force (ES = 0.24-0.26), with a reduced braking phase time (ES = 0.59-1.14). Only landing impulse showed acceptable reliability for landing metrics, with no significant differences between groups. Findings highlight AE's enhance braking (eccentric) metrics and overall CMJ performance. Future research should explore AE in strength-based exercises and further investigate CMJ landing phase metrics.
DOI
10.1519/JSC.0000000000005070
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Comments
Handford, M. J., Bright, T. E., Mundy, P., Lake, J., Theis, N., & Hughes, J. D. (2022). My coach says: The effects of accelerated eccentric and landing cues to elicit change in countermovement jump propulsive and landing performance. The Journal of Strength & Conditioning Research, 39(6), e730-e741. https://doi.org/10.1519/JSC.0000000000005070