Handford, M. J., Bright, T. E., Mundy, P., Lake, J. P., Theis, N. and Hughes, J. D. (2024) My coach says: The effects of accelerated eccentric and landing cues to elicit change in countermovement jump propulsive and landing performance. Journal of Strength and Conditioning Research. pp. 1-42. ISSN 1064-8011 (In Press)
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Abstract
The study aimed to determine if an accelerated eccentric (AE) cue during a countermovement jump (CMJ) produces distinct kinetic outputs. Eighteen strength-trained males (mean ± standard deviation ±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 two 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. Participants performed 4 repetitions of AEDC, AEDP, NORMDC, and NORMDP in a randomized order on two separate occasions. When compared to 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 to 0.46), braking impulse (ES = 0.35 to 0.41), force at minimal displacement (ES = 0.26 to 0.32), and peak propulsion force (ES = 0.24 to 0.26), with a reduced braking phase time (ES = 0.59 to 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.
Publication Type: | Articles |
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Uncontrolled Keywords: | braking strategy, braking, eccentric training, braking force, fast eccentrics |
Subjects: | G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports > GV711 Coaching Q Science > QP Physiology |
Divisions: | Academic Areas > Institute of Sport > Area > Sports Biomechanics and Sports Therapy Research Entities > Centre for Health and Allied Sport and Exercise Science Research (CHASER) |
Related URLs: | |
Depositing User: | Jason Lake |
Date Deposited: | 15 Jan 2025 10:00 |
Last Modified: | 15 Jan 2025 10:00 |
URI: | https://eprints.chi.ac.uk/id/eprint/7878 |