EMG recovery and ratings after back extensor fatigue in patients with lumbar disc herniation and healthy subjects

Abstract

This prospective study aimed to examine whether patients with lumbar disc herniation, before and after surgery, showed impaired recovery from fatigue measured with EMG and subjective ratings as compared to healthy subjects. Forty-three patients due for, and after, lumbar disc surgery and 60 healthy subjects were fatigued using a modified Sørensen's test. Recovery of back extensor muscles was assessed using electromyography and the Borg scale ratings at 1, 2, 3, and 5 minutes of recovery, and was further analyzed using an exponential time-dependence model. The patients completed four questionnaires: the Oswestry, the Roland-Morris, a self-efficacy scale and the SF-36. The exponential time-dependence model was successful for 14 of the 43 patients and 57 of the 60 healthy subjects. The patients for whom the model succeeded had significantly better scores on the questionnaires than those for whom the model was unsuccessful. Specific items related to standing and lifting were identified. The patients' recovery was impaired compared to the healthy subjects, as determined by use of the exponential time-dependence model. The combination of fatigue and recovery measures was reflected in the questionnaire scores and is therefore important for evaluating patients with lumbar disc herniation.

Development of a German version of the Oswestry Disability Index. Part 1: cross-cultural adaptation, reliability, and validity

“…The weighted j values for the individual questions were moderate to very good, ranging from 0.59 (for the ''lifting'' question) to 0.85 (for ''walking''); no j values for the ODI have previously been reported in the literature for comparison [32]. Although the j values reported in the present study indicate that some of the individual questions could be used reliably in sub-analyses, as done in previous studies [12], the questionnaire was originally intended only to provide a sum-score for disability.…”

Low Back Muscle Fatigue Measurements of Cyclic and Prolonged Stooped Work

“…The tendency was an overall decrease for EMG median frequency in the lower back for all conditions. The results from BSME test were similar to previous studies, which further validate the EMG as valid fatigue assessments (Elfving, Liljequist et al 2002;Dedering, Elfving et al 2004). No significant differences were observed between the left and right erector spinae muscles for EMG variables at the point of fatigue which also agrees with previous findings (Elfving, Liljequist et al 2002).…”

“…The change in the slope of the median frequency with respect to time calculated using the least squares method indicates a change in the muscle fatigue rate (Elfving, Liljequist et al 2002;Dedering, Elfving et al 2004). Regression slopes for each muscle group observed were pooled across subjects and subjected to a onetailed Student's t-test to determine if they were significantly less than zero.…”

“…Localized muscle fatigue would cause the EMG median frequencies to decrease (Elfving, Nemeth et al 1999;Elfving, Nemeth et al 2000;Elfving, Liljequist et al 2002;Elfving, Dedering et al 2003) yielding a negative regression slope. The change in the slope of the median frequency with respect to time calculated using the least squares method indicates a change in the muscle fatigue rate (Elfving, Liljequist et al 2002;Dedering, Elfving et al 2004). Regression slopes for each muscle group observed were pooled across subjects and subjected to a onetailed Student's t-test to determine if they were significantly less than zero.…”

Ασκήσεις Σταθεροποίησης Και Μάλαξη Εγκάρσιας Τριβής Ασθενών Χρόνιου Μυοπεριτονιακού Πόνου Με Κλινική Αστάθεια Οσφύος

“…Ωστόσο, σε χρόνιο στάδιο, εμπλέκονται και τα μυϊκά στοιχεία με σχηματισμό σημείων πυροδότησης μυοπεριτονιακού πόνου (ΣΠΜΠ) (Borg-Stein & Wilkins, 2006;Hubbard & Berkoff, 1993;Ge, De las Peñas & Yue, 2011a;Gerwin, Dommerholt & Shah, 2004;Gunn, 1997;O'Neill, Manniche, Graven-Nielsen & Arendt-Nielsen, 2007;Shah et al, 2015;Simons, 2001;Simons, Hong & Simons, 2002) συνυπολογίζοντας τις εκφυλιστικές αλλαγές στους δίσκους και στις ζυγο-αποφυσιακές αρθρώσεις (Adams, Dolan & Hutton, 1988;Adams, Freeman, Morrison, Nelson & Dolan, 2000;Holm, Holm, Ekstrom, Karladani & Hansson, 2004;Yang & King, 1984). Αποτέλεσμα των παραπάνω, είναι η εκδήλωση της κλινικής αστάθειας της ΟΜΣΣ (O'Sullivan, 2000(O'Sullivan, , 2005Panjabi, 2003) με διαφορετικά πρότυπα ενεργοποίησης των σταθεροποιών μυών (Abboud et al, 2014;Chiou et al, 2014;Ghamkhar, Emami, Mohseni-Bandpei & Behtash, 2011;Heydari, Nargol, Jones, Humphrey & Greenough, 2010;Hyde et al, 2012;Sahrmann, 2002), διαταραχές δυναμικής ισορροπίας (Brumagne et al, 2007), κόπωση των παρασπονδυλικών μυών (Abboud et al, 2014;Dedering et al, 2004;Dedering et al, 2010;Dedering et al, 2006;Demulin, Crielaard & Vanderthommen, 2006), λειτουργική ανικανότητα των ασθενών (Waddell, 2004) και διαιώνιση του συνδρόμου του μυοπεριτονιακού πόνου (ΣΜΠ) (Chen & Nizar, 2011).…”