TY  - JOUR
A1  - Prieske, Olaf
A1  - Mühlbauer, Thomas
A1  - Krüger, Tom
A1  - Kibele, A.
A1  - Behm, David George
A1  - Granacher, Urs
T1  - Sex-Specific effects of surface instability on drop jump and landing biomechanics
T2  - International journal of sports medicine
N2  - This study investigated sex-specific effects of surface instability on kinetics and lower extremity kinematics during drop jumping and landing. Ground reaction forces as well as knee valgus and flexion angles were tested in 14 males (age: 23 +/- 2 years) and 14 females (age: 24 +/- 3 years) when jumping and landing on stable and unstable surfaces. Jump height was found to be significantly lower (9 %, p < 0.001) when drop jumps were performed on unstable vs. stable surface. Significantly higher peak ground reaction forces were observed when jumping was performed on unstable vs. stable surfaces (5 %, p = 0.022). Regarding frontal plane kinematics during jumping and landing, knee valgus angles were higher on unstable compared to stable surfaces (1932 %, p < 0.05). Additionally, at the onset of ground contact during landings, females showed higher knee valgus angles than males (222 %, p = 0.027). Sagittal plane kinematics indicated significantly smaller knee flexion angles (6-35 %, p < 0.05) when jumping and landing on unstable vs. stable surfaces. During drop jumps and landings, women showed smaller knee flexion angles at ground contact compared to men (27-33 %, p < 0.05). These findings imply that knee motion strategies were modified by surface instability and sex during drop jumps and landings.
KW  - stretch-shortening cycle
KW  - ground reaction force
KW  - knee joint angle
KW  - injury risk
Y1  - 2015
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/39397
SN  - 0172-4622
SN  - 1439-3964
VL  - 36
IS  - 1
SP  - 75
EP  - 81
PB  - Thieme
CY  - Stuttgart
ER  -