Properties of Force Output and Spectral EMG in Young Patients with          Nonspecific Low Back Pain during Isometric Trunk Extension

Miura, Tatsuhiro; Sakuraba, Keishoku

doi:10.1589/jpts.26.323

Cited by 18 publications

(14 citation statements)

References 64 publications

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“…Muscle activity as recorded by EMG and presented as RMS in all 4 measuring sites displayed an activity level within the same range as previous studies, using similar loading mode and protocols (18,19). In general, a strong valid EMG recording was possible from all sensors, but highly dependent…”

Section: General Observations Emgsupporting

confidence: 76%

A model for evaluation of the electric activity and oxygenation in the erector spinae muscle during isometric loading adapted for spine patients

Ekström

Zhang

Abrahamson

et al. 2020

Preprint

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Background: Simultaneous measurement of electromyography (EMG) and local muscle oxygenation is proposed in an isometric loading model adjusted for patients that have undergone spinal surgery. Methods: Twelve patients with degenerative lumbar spinal stenosis (DLSS) were included. They were subjected to a test protocol before and after surgery. The protocol consisted of two parts, a dynamic and an isometric Ito loading with a time frame of 60 seconds and accompanying rest of 120 seconds. The Ito test was repeated three times. EMG was measured bilaterally at the L4 level and L2 and was recorded using surface electrodes and collected (Biopac Systems Inc). EMG signal was expressed as RMS and median frequency (MF). Muscle tissue oxygen saturation (MrSO 2 ) was monitored using a Near-infrared spectroscopy (NIRS) device ( INVOS ® 5100C Oxymeter). Two NIRS sensors were positioned bilaterally at the L4 level. The intensity of the leg and back pain and perceived exertion before, during and after the test was evaluated with a Visual Analogue Scale (VAS) and Borg RPE-scale, respectively. Results: All patients were able to perform and complete the test protocol pre- and postoperatively. A consistency of lower median and range values was noted in the sensors of EMG1 (15.3 µV, range 4.5-30.7 µV) and EMG2 (13.6 µV, range 4.0 -46.5 µV) that were positioned lateral to NIRS sensors at L4 compared with EMG3 (18.9 µV, range 6.5 -50.0 µV) and EMG4 (20.4 µV, range 7.5 -49.0 µV) at L2. Right and left side of the erector spinae exhibited a similar electrical activity behaviour over time during Ito test (60s). Regional MrSO 2 decreased over time during loading and returned to the baseline level during recovery on both left and right side. Both low back and leg pain was significantly reduced postoperatively. Conclusion: Simultaneous measurement of surface EMG and NIRS seems to be a promising tool for objective assessment of paraspinal muscle function in terms of muscular activity and local muscle oxygenation changes in response to isometric trunk extension in patients that have undergone laminectomy for spinal stenosis. Keywords: Spinal stenosis, EMG, NIRS, paraspinal muscle, muscle oxygenation, muscle activity, laminectomy.

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Section: General Observations Emgsupporting

confidence: 76%

A model for evaluation of the electric activity and oxygenation in the erector spinae muscle during isometric loading adapted for spine patients

Ekström

Zhang

Abrahamson

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Muscle activity as recorded by EMG and presented as RMS in all 4 measuring sites displayed an activity level within the same range as previous studies, using similar loading mode and protocols [18,19]. In general, a strong valid EMG recording was possible from all sensors, but highly dependent on a good reference position (C7) as well as its conductivity.…”

Section: General Observations Emgsupporting

confidence: 76%

A model for evaluation of the electric activity and oxygenation in the erector spinae muscle during isometric loading adapted for spine patients

et al. 2020

View full text Add to dashboard Cite

Background: Simultaneous measurement of electromyography (EMG) and local muscle oxygenation is proposed in an isometric loading model adjusted for patients that have undergone spinal surgery. Methods: Twelve patients with degenerative lumbar spinal stenosis (DLSS) were included. They were subjected to a test protocol before and after surgery. The protocol consisted of two parts, a dynamic and an isometric Ito loading with a time frame of 60 s and accompanying rest of 120 s. The Ito test was repeated three times. EMG was measured bilaterally at the L4 level and L2 and was recorded using surface electrodes and collected (Biopac Systems Inc.). EMG signal was expressed as RMS and median frequency (MF). Muscle tissue oxygen saturation (MrSO 2) was monitored using a near-infrared spectroscopy (NIRS) device (INVOS® 5100C Oxymeter). Two NIRS sensors were positioned bilaterally at the L4 level. The intensity of the leg and back pain and perceived exertion before, during, and after the test was evaluated with a visual analogue scale (VAS) and Borg RPE-scale, respectively. Results: All patients were able to perform and complete the test protocol pre-and postoperatively. A consistency of lower median and range values was noted in the sensors of EMG1 (15.3 μV, range 4.5-30.7 μV) and EMG2 (13.6 μV, range 4.0-46.5 μV) that were positioned lateral to NIRS sensors at L4 compared with EMG3 (18.9 μV, range 6.5-50.0 μV) and EMG4 (20.4 μV, range 7.5-49.0 μV) at L2. Right and left side of the erector spinae exhibited a similar electrical activity behaviour over time during Ito test (60 s). Regional MrSO 2 decreased over time during loading and returned to the baseline level during recovery on both left and right side. Both low back and leg pain was significantly reduced postoperatively. Conclusion: Simultaneous measurement of surface EMG and NIRS seems to be a promising tool for objective assessment of paraspinal muscle function in terms of muscular activity and local muscle oxygenation changes in response to isometric trunk extension in patients that have undergone laminectomy for spinal stenosis.

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“…Motor units composed of type I fibers have more ordered firing characteristics and larger inter-peak periods, and therefore a more synchronous activation. While motor units composed of type II fibers present shorter intervals, frequently present in individuals with low back pain, it can be visualized as an increase in the amplitude of the EMG signal 38 . When the temporal EMG parameters were compared to LM and TrA/IO before the Pilates protocol, the time from onset to peak and the duration of contraction were different.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of the Pilates method for individuals with nonspecific low back pain: clinical and electromyographic aspects.

Machado

Alves

Hendler

et al. 2018

Motriz: rev. educ. fis.

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-Aims:The aim of this study was to verify the influence of Pilates on muscle activation of lumbar multifidus (LM) and transversus abdominis/internal oblique muscles (TrA/IO) in individuals with nonspecific low back pain. Methods: Twelve individuals of both sexes with non-specific low back pain were evaluated before and after a twomonth Pilates program in relation to electromyographic activity of LM and TrA/IO, as well as clinical aspects such as pain, flexibility, muscular endurance, quality of life; and Fear-Avoidance Beliefs Questionnaire (in relation to physical and work-related activities. A statistical analysis was performed using a test for independent samples and significance was established at the level of 0.05. Results: After eight weeks of Pilates training, there was an improvement in the clinical parameters of pain, flexibility, muscular endurance and disability. The individuals presented lower LM activation (p=0.025), higher trunk extension strength (p=0.005) and an increase in time from onset to peak muscle activation (p=0.02). Conclusion: Pilates protocol was effective for clinical improvement and motor behavior in patients with nonspecific low back pain and the parameters assessed showed a large effect size despite the small sample.

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Properties of Force Output and Spectral EMG in Young Patients with Nonspecific Low Back Pain during Isometric Trunk Extension

Cited by 18 publications

References 64 publications

A model for evaluation of the electric activity and oxygenation in the erector spinae muscle during isometric loading adapted for spine patients

A model for evaluation of the electric activity and oxygenation in the erector spinae muscle during isometric loading adapted for spine patients

A model for evaluation of the electric activity and oxygenation in the erector spinae muscle during isometric loading adapted for spine patients

Effectiveness of the Pilates method for individuals with nonspecific low back pain: clinical and electromyographic aspects.

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