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Vertical drop jump landing depth influences knee kinematics in female recreational athletes

Ryman Augustsson, Sofia LU ; Tranberg, Roy; Zügner, Roland and Augustsson, Jesper (2018) In Physical Therapy in Sport 33. p.133-138
Abstract (Swedish)
Objectives: To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and
stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes.
The purpose was also to identify whether leg muscle strength is a predictive factor for knee control
during a VDJ.
Design: Cross-sectional.
Setting: Biomechanics laboratory. Participants: Eighteen women aged between 18 and 30 years.
Main outcome measures: Three VDJ tests were used for biomechanical analysis: 1) small “bounce” jump
(BJ), 2) deep “countermovement” jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects
also performed an isometric knee-extension strength test, dichotomized to ‘weak’... (More)
Objectives: To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and
stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes.
The purpose was also to identify whether leg muscle strength is a predictive factor for knee control
during a VDJ.
Design: Cross-sectional.
Setting: Biomechanics laboratory. Participants: Eighteen women aged between 18 and 30 years.
Main outcome measures: Three VDJ tests were used for biomechanical analysis: 1) small “bounce” jump
(BJ), 2) deep “countermovement” jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects
also performed an isometric knee-extension strength test, dichotomized to ‘weak’ versus ‘strong’ subjects
according to median and quartiles.
Results: There were greater knee valgus angles during landing for both the CMJW and CMJN test
compared to the BJ test (p 0.05). Differences in knee valgus between weak and strong subjects were
significant for the BJ test (p ¼ 0.044) but not for any of the other tests.
Conclusions: VDJ landing depth influences knee kinematics in women. Landing depth may therefore be
considered when screening athletes using the VDJ test. Also, muscle strength seems to influence the
amount of knee valgus angles, but the difference was not statistically significant (except for the BJ test) in
this small cohort. (Less)
Abstract
Objectives

To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes. The purpose was also to identify whether leg muscle strength is a predictive factor for knee control during a VDJ.
Design

Cross-sectional.
Setting

Biomechanics laboratory. Participants: Eighteen women aged between 18 and 30 years.
Main outcome measures

Three VDJ tests were used for biomechanical analysis: 1) small “bounce” jump (BJ), 2) deep “countermovement” jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects also performed an isometric knee-extension strength test, dichotomized... (More)
Objectives

To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes. The purpose was also to identify whether leg muscle strength is a predictive factor for knee control during a VDJ.
Design

Cross-sectional.
Setting

Biomechanics laboratory. Participants: Eighteen women aged between 18 and 30 years.
Main outcome measures

Three VDJ tests were used for biomechanical analysis: 1) small “bounce” jump (BJ), 2) deep “countermovement” jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects also performed an isometric knee-extension strength test, dichotomized to ‘weak’ versus ‘strong’ subjects according to median and quartiles.
Results

There were greater knee valgus angles during landing for both the CMJW and CMJN test compared to the BJ test (p ≤ 0.05). Differences in knee valgus between weak and strong subjects were significant for the BJ test (p = 0.044) but not for any of the other tests.
Conclusions

VDJ landing depth influences knee kinematics in women. Landing depth may therefore be considered when screening athletes using the VDJ test. Also, muscle strength seems to influence the amount of knee valgus angles, but the difference was not statistically significant (except for the BJ test) in this small cohort. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Therapy in Sport
volume
33
pages
133 - 138
publisher
Elsevier
external identifiers
  • scopus:85053209865
ISSN
1873-1600
DOI
10.1016/j.ptsp.2018.08.002
language
English
LU publication?
yes
id
c49d8ee8-03c1-40df-b22c-ea6901935eb2
date added to LUP
2018-09-21 09:54:28
date last changed
2019-01-06 14:05:20
@article{c49d8ee8-03c1-40df-b22c-ea6901935eb2,
  abstract     = {Objectives<br/><br/>To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes. The purpose was also to identify whether leg muscle strength is a predictive factor for knee control during a VDJ.<br/>Design<br/><br/>Cross-sectional.<br/>Setting<br/><br/>Biomechanics laboratory. Participants: Eighteen women aged between 18 and 30 years.<br/>Main outcome measures<br/><br/>Three VDJ tests were used for biomechanical analysis: 1) small “bounce” jump (BJ), 2) deep “countermovement” jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects also performed an isometric knee-extension strength test, dichotomized to ‘weak’ versus ‘strong’ subjects according to median and quartiles.<br/>Results<br/><br/>There were greater knee valgus angles during landing for both the CMJW and CMJN test compared to the BJ test (p ≤ 0.05). Differences in knee valgus between weak and strong subjects were significant for the BJ test (p = 0.044) but not for any of the other tests.<br/>Conclusions<br/><br/>VDJ landing depth influences knee kinematics in women. Landing depth may therefore be considered when screening athletes using the VDJ test. Also, muscle strength seems to influence the amount of knee valgus angles, but the difference was not statistically significant (except for the BJ test) in this small cohort.},
  author       = {Ryman Augustsson, Sofia and Tranberg, Roy and  Zügner, Roland and Augustsson, Jesper},
  issn         = {1873-1600},
  language     = {eng},
  pages        = {133--138},
  publisher    = {Elsevier},
  series       = {Physical Therapy in Sport},
  title        = {Vertical drop jump landing depth influences knee kinematics in female recreational athletes},
  url          = {http://dx.doi.org/10.1016/j.ptsp.2018.08.002},
  volume       = {33},
  year         = {2018},
}