Volume 24, Number 4 (2-2011)                   Med J Islam Repub Iran 2011 | Back to browse issues page

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Motealleh A, Maroufi N, Sarrafzadeh J, Sanjari M. The test-retest reliability of the onset of core and vasti electromyographic activity while ascending and descending stairs in healthy controls and patellofemoral pain patients. Med J Islam Repub Iran. 2011; 24 (4) :221-231
URL: http://mjiri.iums.ac.ir/article-1-221-en.html

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Abstract:   (3029 Views)



entity. It is hypothesized to result from abnormal patellar tracking caused by altered motor

control. Deficit in neuromotor control of the core may be a remote contributing factor to the

development of PFP. Application of reliable EMG measures would be helpful to handle this

theory. Therefore, the purpose of this study was to determine the test-retest reliability of the

core and vasti EMG onsets, while ascending/descending stairs.

: Patellofemoral pain (PFP) is a common affliction and complex clinical


and Core EMG onsets during stair stepping were assessed two times a day. Intraclass correlation

coefficients (ICCs) and standard errors of measurement (SEMs) were calculated.

: Ten males with PFP and ten healthy controls participated in this study. Vasti


onsets of control cases (ICC 3,1 ≥ 0.70) except Quadratus Lumborum (QL) which showed

a moderate reliability (ICC for ascending=0.59 and for descending = 0.61). In controls,

Vasti in both tasks showed the highest absolute reliability. During ascending, high

reliability (ICC ≥ 0.70) in PFP group was demonstrated for all EMG onsets except Gluteus

maximus (GMAX) and QL which showed a moderate reliability (ICC = 0.69 and 0.63 respectively).

In this group while descending stairs, all EMG onsets showed high relative

reliability (ICC ≥ 0.70). Moderate to high absolute reliability was obtained for onset times

while ascending/descending stairs in PFP group.

: During both ascending/descending, high reliability was found for all EMG



: Most EMG onsets during stair ascending/descending had moderate to high
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Type of Study: Original Research | Subject: Rehabilitation

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