Altered squat jumping mechanics after specific exercise

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Altered squat jumping mechanics after specific exercise. / Ullrich, Boris; Heinrich, Kai; Goldmann, Jan-Peter; Brüggemann, Gert-Peter.

In: International journal of sports medicine, Vol. 31, No. 4, 01.04.2010, p. 243-250.

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@article{6e2000ed952c49fa8d6b54026cbd1368,
title = "Altered squat jumping mechanics after specific exercise",
abstract = "This study examined squat jumping (SJ) mechanics following length restricted strength training regimens of the knee extensors and flexors. SJ from a 110 degrees knee joint angle starting position and isometric moment-knee angle relations of knee extensors and flexors were analysed in 16 athletes before and directly after 8 weeks of strength training regimens that were restricted to knee joint angles corresponding to long muscle-tendon unit (MTU) length for the knee extensors and flexors. SJ mechanics were studied using a two-dimensional kinematic model with three rigid bodies (upper leg, lower leg, foot) in combination with force plates measurements of ground reaction force in the right and left lower extremity. Centre of mass jumping height significantly (p<0.05) increased post training, but this was not explained by enhanced absolute power generation in the knee joint. However, post training small but significant (p<0.05) shifts to smaller knee joint angles occurred in the normalized [{\%} Max.] knee joint angle dependent power generation in the right and left knee joint during SJ. The isometric moment-knee angle relation of the knee extensors was also significantly (p<0.05) shifted to longer MTU lengths of knee extensors. Length restricted strength training may alter the mechanical situation during both isometric contractions and dynamic athletic movements.",
keywords = "Arthrometry, Articular, Biomechanical Phenomena, Exercise, Female, Humans, Isometric Contraction, Knee Joint, Leg, Male, Muscle Strength, Muscle, Skeletal, Posture, Resistance Training, Sports, Statistics as Topic, Time Factors, Young Adult",
author = "Boris Ullrich and Kai Heinrich and Jan-Peter Goldmann and Gert-Peter Br{\"u}ggemann",
note = "Copyright Georg Thieme Verlag KG Stuttgart . New York.",
year = "2010",
month = "4",
day = "1",
doi = "10.1055/s-0029-1242813",
language = "English",
volume = "31",
pages = "243--250",
journal = "International journal of sports medicine",
issn = "0172-4622",
publisher = "Georg Thieme Verlag",
number = "4",

}

RIS

TY - JOUR

T1 - Altered squat jumping mechanics after specific exercise

AU - Ullrich, Boris

AU - Heinrich, Kai

AU - Goldmann, Jan-Peter

AU - Brüggemann, Gert-Peter

N1 - Copyright Georg Thieme Verlag KG Stuttgart . New York.

PY - 2010/4/1

Y1 - 2010/4/1

N2 - This study examined squat jumping (SJ) mechanics following length restricted strength training regimens of the knee extensors and flexors. SJ from a 110 degrees knee joint angle starting position and isometric moment-knee angle relations of knee extensors and flexors were analysed in 16 athletes before and directly after 8 weeks of strength training regimens that were restricted to knee joint angles corresponding to long muscle-tendon unit (MTU) length for the knee extensors and flexors. SJ mechanics were studied using a two-dimensional kinematic model with three rigid bodies (upper leg, lower leg, foot) in combination with force plates measurements of ground reaction force in the right and left lower extremity. Centre of mass jumping height significantly (p<0.05) increased post training, but this was not explained by enhanced absolute power generation in the knee joint. However, post training small but significant (p<0.05) shifts to smaller knee joint angles occurred in the normalized [% Max.] knee joint angle dependent power generation in the right and left knee joint during SJ. The isometric moment-knee angle relation of the knee extensors was also significantly (p<0.05) shifted to longer MTU lengths of knee extensors. Length restricted strength training may alter the mechanical situation during both isometric contractions and dynamic athletic movements.

AB - This study examined squat jumping (SJ) mechanics following length restricted strength training regimens of the knee extensors and flexors. SJ from a 110 degrees knee joint angle starting position and isometric moment-knee angle relations of knee extensors and flexors were analysed in 16 athletes before and directly after 8 weeks of strength training regimens that were restricted to knee joint angles corresponding to long muscle-tendon unit (MTU) length for the knee extensors and flexors. SJ mechanics were studied using a two-dimensional kinematic model with three rigid bodies (upper leg, lower leg, foot) in combination with force plates measurements of ground reaction force in the right and left lower extremity. Centre of mass jumping height significantly (p<0.05) increased post training, but this was not explained by enhanced absolute power generation in the knee joint. However, post training small but significant (p<0.05) shifts to smaller knee joint angles occurred in the normalized [% Max.] knee joint angle dependent power generation in the right and left knee joint during SJ. The isometric moment-knee angle relation of the knee extensors was also significantly (p<0.05) shifted to longer MTU lengths of knee extensors. Length restricted strength training may alter the mechanical situation during both isometric contractions and dynamic athletic movements.

KW - Arthrometry, Articular

KW - Biomechanical Phenomena

KW - Exercise

KW - Female

KW - Humans

KW - Isometric Contraction

KW - Knee Joint

KW - Leg

KW - Male

KW - Muscle Strength

KW - Muscle, Skeletal

KW - Posture

KW - Resistance Training

KW - Sports

KW - Statistics as Topic

KW - Time Factors

KW - Young Adult

U2 - 10.1055/s-0029-1242813

DO - 10.1055/s-0029-1242813

M3 - Journal articles

C2 - 20180174

VL - 31

SP - 243

EP - 250

JO - International journal of sports medicine

JF - International journal of sports medicine

SN - 0172-4622

IS - 4

ER -

ID: 27525