• Eduardo Enrique Guzmán Muñoz Universidad Santo Tomás, Chile, Chile
  • Yeny Fabiola Concha Cisternas Universidad Santo Tomás, Chile, Chile
Keywords: Patellofemoral pain syndrome, muscle latency, muscle reaction time, electromyography


Purpose: To determine the onset latency of the vastus medialis oblique (VMO) and vastus lateralis (VL) muscles in individuals with patellofemoral pain syndrome (PFPS). Methodology: A case-control study. Fourteen female participants with PFPS and fifteen female participants without PFPS performed a sudden lower extremity perturbation test in anterior and posterior directions. The electromyographic onset latency of the VMO and VL were measured during this test. A student’s t-test was used to compare muscle latency between the groups. Significance level was established a priori at P < 0.05. Results: During sudden anterior perturbation a significant latency delay of the VMO (p < 0.001) and VL muscles (p = 0.019) was observed in participants with PFPS. In the sudden posterior perturbation a delayed response in the activation of VMO (p = 0.023) and VL (p < 0.038) muscles was observed in individuals with PFPS. Conclusions: The results of this study indicate that individuals with PFPS have a motor deficit reflected in the latency delay of VMO and VL muscles during a sudden perturbation in the sagittal plane.

Author Biographies

Eduardo Enrique Guzmán Muñoz, Universidad Santo Tomás, Chile
Escuela de Kinesiología, Jefe de Carrera. Facultad de Salud, Universidad Santo Tomás, Chile.
Yeny Fabiola Concha Cisternas, Universidad Santo Tomás, Chile
Escuela de Enfermería, Facultad de Salud, Universidad Santo Tomás, Chile


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How to Cite
Guzmán Muñoz, E. E., & Concha Cisternas, Y. (2016). LATENCY DELAY OF THE VASTUS MEDIALIS OBLIQUE AND VASTUS LATERALIS IN INDIVIDUALS WITH PATELLOFEMORAL PAIN SYNDROME. MHSalud: Revista En Ciencias Del Movimiento Humano Y Salud, 13(2).

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