Divergence analysis of failed and successful unanticipated single-leg landings reveals the importance of the flight phase and upper body biomechanics
(2020) In Journal of Biomechanics 109.- Abstract
The purpose of this study was to describe neuromuscular and kinematic differences during failed and successful drop-vertical jumps in a pediatric population. Healthy young athletes (n = 32) completed single-leg drop vertical jump landings where the required landing leg was unanticipated. Trials were categorized as failed if the participant shifted their base of support during the landing. Joint kinematics and muscle activation amplitudes were time normalized over the flight and landing phases. Statistical parametric mapping (SPM) was used to compare landings and a moving average convergence divergence oscillator was then calculated to determine where failed and successful waveforms began to diverge prior to reaching statistical... (More)
The purpose of this study was to describe neuromuscular and kinematic differences during failed and successful drop-vertical jumps in a pediatric population. Healthy young athletes (n = 32) completed single-leg drop vertical jump landings where the required landing leg was unanticipated. Trials were categorized as failed if the participant shifted their base of support during the landing. Joint kinematics and muscle activation amplitudes were time normalized over the flight and landing phases. Statistical parametric mapping (SPM) was used to compare landings and a moving average convergence divergence oscillator was then calculated to determine where failed and successful waveforms began to diverge prior to reaching statistical significance. SPM determined that participants performed the failed trials with reduced pelvic tilt towards the landing limb during 41–69% of the flight phase, greater trunk flexion angle during 31–100% of the landing phase and greater trunk tilt away from the landing limb during 3–13% and 21–90% of the landing phase. Greater rectus femoris activation during the failed trials was identified during 88–100% of the flight phase, as well as 1–4% and 71–97% of the landing phase. Greater gluteus medius and biceps femoris activation was also identified in the failed trials during 54–72% and 76–89% of the landing phase respectively. These findings indicate that the control of proximal joints has an important role in determining if a participant will fail a landing; and that how athletes prepare for a landing may be more relevant than the kinematics following ground contact.
(Less)
- author
- Romanchuk, Nicholas J. ; Smale, Kenneth B. ; Del Bel, Michael J. and Benoit, Daniel L. LU
- publishing date
- 2020-08-26
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Drop-jumps, Electromyography, Kinematics, Knee, Youth
- in
- Journal of Biomechanics
- volume
- 109
- article number
- 109879
- publisher
- Elsevier
- external identifiers
-
- scopus:85087963839
- pmid:32807323
- ISSN
- 0021-9290
- DOI
- 10.1016/j.jbiomech.2020.109879
- language
- English
- LU publication?
- no
- additional info
- Funding Information: The authors would like to thank Lisa Ek Orloff, Saskia Hanssen, Laura Boonstra, Laryssa Kemp and Céline Girard for their contributions in data collections. They would also like to thank the Ontario Graduate Scholarship, Natural Sciences and Engineering Research Council of Canada and the University of Ottawa for their support in the form of student and operating grants. Publisher Copyright: © 2020 Elsevier Ltd
- id
- c30fb62e-eb26-4da8-b104-9c7b7dadcc75
- date added to LUP
- 2023-08-24 16:30:01
- date last changed
- 2024-06-01 06:05:06
@article{c30fb62e-eb26-4da8-b104-9c7b7dadcc75,
abstract = {{<p>The purpose of this study was to describe neuromuscular and kinematic differences during failed and successful drop-vertical jumps in a pediatric population. Healthy young athletes (n = 32) completed single-leg drop vertical jump landings where the required landing leg was unanticipated. Trials were categorized as failed if the participant shifted their base of support during the landing. Joint kinematics and muscle activation amplitudes were time normalized over the flight and landing phases. Statistical parametric mapping (SPM) was used to compare landings and a moving average convergence divergence oscillator was then calculated to determine where failed and successful waveforms began to diverge prior to reaching statistical significance. SPM determined that participants performed the failed trials with reduced pelvic tilt towards the landing limb during 41–69% of the flight phase, greater trunk flexion angle during 31–100% of the landing phase and greater trunk tilt away from the landing limb during 3–13% and 21–90% of the landing phase. Greater rectus femoris activation during the failed trials was identified during 88–100% of the flight phase, as well as 1–4% and 71–97% of the landing phase. Greater gluteus medius and biceps femoris activation was also identified in the failed trials during 54–72% and 76–89% of the landing phase respectively. These findings indicate that the control of proximal joints has an important role in determining if a participant will fail a landing; and that how athletes prepare for a landing may be more relevant than the kinematics following ground contact.</p>}},
author = {{Romanchuk, Nicholas J. and Smale, Kenneth B. and Del Bel, Michael J. and Benoit, Daniel L.}},
issn = {{0021-9290}},
keywords = {{Drop-jumps; Electromyography; Kinematics; Knee; Youth}},
language = {{eng}},
month = {{08}},
publisher = {{Elsevier}},
series = {{Journal of Biomechanics}},
title = {{Divergence analysis of failed and successful unanticipated single-leg landings reveals the importance of the flight phase and upper body biomechanics}},
url = {{http://dx.doi.org/10.1016/j.jbiomech.2020.109879}},
doi = {{10.1016/j.jbiomech.2020.109879}},
volume = {{109}},
year = {{2020}},
}