Stensdotter Ann-Katrin, Hodges Paul, Ohberg Fredrik, Häger-Ross Charlotte
Umeå University, Umeå, Sweden.
J Mot Behav. 2007 May;39(3):194-202. doi: 10.3200/JMBR.39.3.194-202.
The authors investigated whether the discrepancy noted in the literature regarding delayed and decreased activity in vastus medialis obliquus (VMO) in people with patellofemoral pain (PFP) depends on the nature of the open kinetic chain (OKC) and the closed kinetic chain (CKC) in the experimental task. They hypothesized that activity in VMO would be more delayed and decreased in CKC tasks than in OKC tasks. Women with PFP (n = 17) and healthy controls (n = 17) performed isometric quadriceps contractions in CKC and OKC tasks. The authors manipulated only the application of resistance. Electromyographs (EMGs) showed that participants with PFP reacted later and activated the quadriceps more in the CKC task but had intramuscular quadriceps coordination similar to that of controls. The nature of the OKC task or the CKC task does not seem to explain contradictory findings regarding VMO activation.
作者们研究了文献中所指出的髌股疼痛（PFP）患者股内侧斜肌（VMO）活动延迟和减弱的差异是否取决于实验任务中开链运动（OKC）和闭链运动（CKC）的性质。他们假设，与OKC任务相比，VMO在CKC任务中的活动会更延迟且减弱。患有PFP的女性（n = 17）和健康对照组（n = 17）在CKC和OKC任务中进行等长股四头肌收缩。作者仅对阻力的施加进行了操控。肌电图（EMG）显示，患有PFP的参与者反应较晚，且在CKC任务中股四头肌的激活程度更高，但股四头肌的肌肉内协调性与对照组相似。OKC任务或CKC任务的性质似乎并不能解释关于VMO激活的矛盾研究结果。
