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Author/Association: Witvrouw E, Cambier D, Danneels L, Bellemans J, Werner S, Almqvist F, Verdonk R
Title: The effect of exercise regimens on reflex response time of the vasti muscles in patients with anterior knee pain: a prospective randomized intervention study [with consumer summary]
Source: Scandinavian Journal of Medicine & Science in Sports 2003 Aug;13(4):251-258
Method: clinical trial
Method Score: 7/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*
Consumer Summary: PERSPECTIVES: The present study showed no significant alterations in reflex response times of VMO and/or VL after either an open or a closed kinetic chain exercise program in patients with anterior knee pain. This finding suggests that the anterior knee pain patients still have an insufficient reflex response of their quadriceps muscle after the training period. This insufficient reflex response of the quadriceps might lead to a diminished spinal capacity of the quadriceps muscle to respond correctly and to provide the PF-joint with sufficient stability during sudden movements. Based on our findings we are making an attempt to state that if the primary objective of an exercise program is to modify the reflex response time of VMO and VL, the use of these two investigated exercise programs is not to be advised. In addition, these findings emphasize the need for studies analyzing the effect of specifically designed 'VMO timing' programs on neuromuscular parameters. Interestingly enough, despite the lack of significant alteration of the reflex response times of VMO and VL, we observed a significant anterior knee pain reduction in both groups. Subsequently, while the exact relationship between the timing of VMO and VL in patients with anterior knee pain and their symptoms remains enigmatic, functional improvements have been observed without alterations in muscle reflex response times.
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