TY  - JOUR
AU  - Palmieri-Smith, Riann M.
A2  - Palmieri-Smith, Riann M.
A2  - McLean, Scott G.
A2  - Ashton-Miller, James A.
A2  - Wojtys, Edward M.
DB  - BISp
DP  - BISp
KW  - Abduktion
KW  - Analyse, biomechanische
KW  - Biomechanik
KW  - Elektromyographie
KW  - Geschlechtsunterschied
KW  - Kinematik
KW  - Kinetik
KW  - Kniegelenk
KW  - Kreuzbandverletzung
KW  - M. quadriceps femoris
KW  - Muskelaktivität
KW  - Muskulatur, ischiocrurale
KW  - Neuromotorik
KW  - Sprung
KW  - Untersuchung, empirische
KW  - Verletzungsgefahr
LA  - eng
TI  - Association of quadriceps and hamstrings cocontraction patterns with knee joint loading
TT  - Verbindung von Kokontraktionsmustern des M. quadriceps femoris und der ischiocruralen Muskulatur mit der Belastung des Kniegelenks
PY  - 2009
N2  - Context: Sex differences in neuromuscular control of the lower extremity have been identified as a potential cause for the greater incidence of anterior cruciate ligament (ACL) injuries in female athletes compared with male athletes. Women tend to land in greater knee valgus with higher abduction loads than men. Because knee abduction loads increase ACL strain, the inability to minimize these loads may lead to ACL failure. Objective: To investigate the activation patterns of the quadriceps and hamstrings muscles with respect to the peak knee abduction moment. Design: Cross-sectional study. Setting: Neuromuscular research laboratory. Patients or Other Participants: Twenty-one recreationally active adults (11 women, 10 men). Main Outcome Measure(s): Volunteers performed 3 trials of a 100-cm forward hop. During the hop task, we recorded surface electromyographic data from the medial and lateral hamstrings and quadriceps and recorded lower extremity kinematics and kinetics. Lateral and medial quadriceps-to-hamstrings (QH) cocontraction indices, the ratio of medial-to-lateral QH cocontraction, normalized root mean square electromyographic data for medial and lateral quadriceps and hamstrings, and peak knee abduction moment were calculated and used in data analyses. Results: Overall cocontraction was lower in women than in men, whereas activation was lower in the medial than in the lateral musculature in both sexes (P < .05). The medial QH cocontraction index (R2  =  0.792) accounted for a significant portion of the variance in the peak knee abduction moment in women (P  =  .001). Women demonstrated less activation in the vastus medialis than in the vastus lateralis (P  =  .49) and less activation in the medial hamstrings than in the lateral hamstrings (P  =  .01). Conclusions: Medial-to-lateral QH cocontraction appears to be unbalanced in women, which may limit their ability to resist abduction loads. Because higher abduction loads increase strain on the ACL, restoring medial-to-lateral QH cocontraction balance in women may help reduce ACL injury risk. Verf.-Referat
L2  - http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2681209/pdf/attr-44-03-256.pdf
L2  - https://dx.doi.org/10.4085/1062-6050-44.3.256
DO  - 10.4085/1062-6050-44.3.256
SP  - S. 256-263
SN  - 1062-6050
JO  - Journal of athletic training
IS  - 3
VL  - 44
M3  - Elektronische Ressource (online)
M3  - Gedruckte Ressource
ID  - PU201105004307
ER  -