Impaired neural drive in patients with low back pain

Chiou, See-Ying; Shih, Yi-Fen; Chou, Li-Wei; McGregor, Alison H.; Strutton, Paul H.

doi:10.1002/j.1532-2149.2013.00428.x

Cited by 34 publications

(36 citation statements)

References 47 publications

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“…Both an increased intramuscular fat content accompanied by a decreased SEMG fatigue could result from either non-recruitable, denervated muscle fibers in consequence to axonal degeneration with a consecutively increased proportion of type I fibers because of neuromuscular regeneration, or from long-term recruitment failure of high threshold type II glycolytic muscle fibers (McGregor et al 2014). The former likely suggests degeneration followed by secondary (incomplete) regeneration (McGregor et al 2014), and the latter, long-term impairment in neural drive with secondary inactivity-driven adaptations in muscle fibers (Chiou et al 2014). Previous research into normative values for paraspinal denervation using needle EMG showed older asymptomatic study participants had more denervation than younger ones (Tong et al 2005).…”

Section: Mf-semg Changes With Fatiguementioning

confidence: 99%

Age- and sex-specific effects in paravertebral surface electromyographic back extensor muscle fatigue in chronic low back pain

et al. 2019

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The impact of aging on the back muscles is not well understood, yet may hold clues to both normal aging and chronic low back pain (cLBP). This study sought to investigate whether the median frequency (MF) surface electromyographic (SEMG) back muscle fatigue method-a proxy for glycolytic muscle metabolismwould be able to detect age-and sex-specific differences in neuromuscular and muscle metabolic functions in individuals with cLBP in a reliable way, and whether it would be as sensitive as when used on healthy individuals. With participants seated on a dynamometer (20°t runk anteflexion), paraspinal SEMG activity was recorded bilaterally from the multifidus (L5), longissimus (L2), and iliolumbalis (L1) muscles during isometric, sustained back extensions loaded at 80% of maximum from 117 younger (58 females) and 112 older (56 female) cLBP individuals. Tests were repeated after 1-2 days and 6 weeks. Median frequency, the SEMG variable indicating neuromuscular fatigue, was analyzed. Maximum back extensor strength was comparable between younger and older participants. Significantly less MF-SEMG back muscle fatigue was observed in older as compared to younger, and in older female as compared to older male cLBP individuals. Relative reliability was excellent, but absolute reliability appeared large for this SEMG-fatigue measure. Findings suggest that cLBP likely does not mask the age-specific diagnostic potential of the MF-SEMG back extensor fatigue method. Thus, this method possesses a great potential to be further developed into a valuable biomarker capable of detecting back muscle function at risk of sarcopenia at very early stages.

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Section: Mf-semg Changes With Fatiguementioning

confidence: 99%

Age- and sex-specific effects in paravertebral surface electromyographic back extensor muscle fatigue in chronic low back pain

et al. 2019

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“…; Chiou et al . ). An increase in the MEP amplitude in ES during a static arm abduction in both standing and lying positions has been reported (Davey et al .…”

Section: Introductionmentioning

confidence: 97%

Cortical contributions to anticipatory postural adjustments in the trunk

Chiou

Hurry

Reed

et al. 2018

The Journal of Physiology

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Voluntary limb movements are associated with increases in trunk muscle activity, some of which occur within a time window considered too fast to be induced by sensory feedback; these increases are termed anticipatory postural adjustments (APAs). Although it is known that the function of APAs is to maintain postural stability in response to perturbations, excitability of the corticospinal projections to the trunk muscles during the APAs remains unclear. Thirty-four healthy subjects performed rapid shoulder flexion in response to a visual cue in standing and lying positions. Transcranial magnetic stimulation (TMS) was delivered over the trunk motor cortex to examine motor evoked potentials (MEPs) in erector spinae (ES) and in rectus abdominis (RA) muscles at several time points prior to the rise in electromyographic activity (EMG) of anterior deltoid (AD) muscle. TMS was also used to assess short-interval intracortical inhibition (SICI) and cervicomedullary MEPs (CMEPs) in ES in the standing position. MEPs in ES were larger at time points closer to the rise in AD EMG in both standing and lying positions, whereas MEPs in RA did not differ over the time course examined. Notably, SICI was reduced at time points closer to the rise in AD EMG, with no change in CMEPs. Our results demonstrate that increasing excitability of corticospinal projections to the trunk muscles prior to a voluntary limb movement is likely to be cortical in origin and is muscle specific.

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“…A simple to take measurement involves determination of Maximum Voluntary Force (MVC). However, an MVC measure can only be an approximation of a subject's force capacity, because it is influenced by motivation [6,7], experience with the required task [8], side dominance [9], tolerance to discomfort and pain [10], age [11], and sex [12,13]. Frequently the MVC is taken as the only measure to assess success of interventions.…”

Section: Introductionmentioning

confidence: 99%

The Neuromuscular Efficiency of Trunk Muscles is Altered by Age in the Abdominal Muscles but by Gender in the Back Muscles

Anders¹,

Huebner²,

Faenger³

2018

Int J Sports Exerc Med

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Purpose: Several measures are applied to characterize the functional state of muscles. Among these, the Maximum Voluntary Contraction (MVC) is most frequently used and considered the gold standard. A little understood and used measure is Neuromuscular Efficiency (NME) of muscles. Therefore, the present study was conducted to compare NME indices of several trunk muscles of healthy adults with respect to age and sex. Methods: Overall 100 healthy Caucasian subjects (equally distributed in young (19-39 years) and elderly (48-71 years) and persons of both sexes, i.e. 25 subjects per age group and sex) were investigated during submaximal and maximal isometric tasks of their trunk muscles in sagittal plane. Five major superficial trunk muscles were evaluated by means of Surface EMG (SEMG). NME and MVC values were extracted. NME was calculated using the inverse slope of the logarithmic transform of the SEMG amplitude to torque relationships of the submaximal tests. Results: The abdominal muscles showed no sex differences in NME but were always superior in both elderly groups. As could be expected MVC levels during flexion of men were higher but interestingly no age related MVC differences could be detected. However, for the back muscles NME showed no age-related effects and during extension MVC was reduced with age. Males compared with females showed significantly higher NME indices and also higher MVC values. Absolute SEMG amplitudes levels of all investigated trunk muscles were always lower in the elderly subjects. Conclusions: The NME is an SEMG amplitude independent parameter and may be applied to determine the functional state of (trunk) muscles as a complement to MVC measurements. The observed systematic differences of NME indices between sexes and age groups careful hint towards the NME being related to the functional cross-sectional area of type I fibers.

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Impaired neural drive in patients with low back pain

Cited by 34 publications

References 47 publications

Age- and sex-specific effects in paravertebral surface electromyographic back extensor muscle fatigue in chronic low back pain

Age- and sex-specific effects in paravertebral surface electromyographic back extensor muscle fatigue in chronic low back pain

Cortical contributions to anticipatory postural adjustments in the trunk

The Neuromuscular Efficiency of Trunk Muscles is Altered by Age in the Abdominal Muscles but by Gender in the Back Muscles

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