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Changes in Knee Vastii Muscle Activity in Women with Patellofemoral Pain Syndrome During the Menstrual Cycle
Author(s) -
Samani Mahbobeh,
Kordi Yoosefinejad Amin,
Campos Mario H.,
Lira Claudio A. B.,
Motealleh Alireza
Publication year - 2020
Publication title -
pmandr
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.617
H-Index - 66
eISSN - 1934-1563
pISSN - 1934-1482
DOI - 10.1002/pmrj.12239
Subject(s) - patellofemoral pain syndrome , menstrual cycle , medicine , physical therapy , follicular phase , physical medicine and rehabilitation , electromyography , rehabilitation , vastus medialis , hormone , alternative medicine , pathology
Background Changes in hormonal levels during the menstrual cycle are known to affect muscle electromyographic (EMG) activity, but no studies have investigated the effect of hormonal changes on the EMG activity of muscles around the knee in patients with patellofemoral pain syndrome (PFPS). Objective To evaluate the EMG activity of the vastus medialis obliquus (VMO) and vastus lateralis (VL) muscles during toe rise and heel rock tasks in different phases of the menstrual cycle in women with PFPS. Design Cross sectional study. Setting Rehabilitation Research Center at the School of Rehabilitation Sciences of Shiraz University of Medical Sciences. Participants Ten women with PFPS between 18 and 40 years of age. Intervention Not applicable. Main Outcome Measures The VL/VMO amplitude ratio and differences between onset (onset VL−onset VMO) of vastii muscle activity were measured in the affected limb during rise and rock tasks in the follicular and ovulatory phases of the menstrual cycle. The signals were analyzed with MATLAB software. Results During both tasks, there were no significant changes in onset differences in vastii muscles between the ovulatory and follicular phases. However, the amplitude ratio (VL/VMO) was significantly lower in the ovulatory phase compared to the follicular phase ( P = .035 for rise tasks and .010 for rock tasks). Conclusion The menstrual cycle may affect some EMG parameters. These factors can be taken into account when planning sports and rehabilitation training programs.