Trunk extensor endurance: determination and relation to low-back trouble

Jørgensen, Kenneth Mølbjerg; Nicolaisen, T

doi:10.1080/00140138708969704

Cited by 104 publications

(59 citation statements)

References 9 publications

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“…This variable has demonstrated to be related with the occurrence of low-back pain (14,15) , once the IRT of volunteers with low-back pain has demonstrated to be significantly lower when compared with healthy volunteers (2,16,17) . Other variable related with the etiology of the low-back disorders is the muscular strength.…”

Section: Discussionmentioning

confidence: 99%

Análise de parâmetros de força e resistência dos músculos eretores da espinha lombar durante a realização de exercício isométrico em diferentes níveis de esforço

Gonçalves

Barbosa

2005

Rev Bras Med Esporte

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The low-back pain has demonstrated to be a common finding among athletes and particularly the overload in the lumbar column resulting from a strength or isometric resistance involvement of muscles of this segment as result of the muscular fatigue has been considered as important etiological factor for its development. In this context, tests used for the training evaluation of the lumbar spinae erector muscles are emphasized. In the present study, the analysis of the strength and isometric resistance parameters was used with the objective of evaluating responses of these muscles during maximal and sub-maximal voluntary isometric contractions (MVIC) in two situations: with fatigue and without fatigue induced by isometric exercise performed until exhaustion. Nine male healthy volunteers performed MVIC before and after vertebral column extension exercises supporting 5%, 10%, 15% and 20% of the MVIC. In each one of these situations, the electromyographic signal (EMG) of the iliocostalis and multifidus muscles as well as the strength level generated in the MVIC were recorded. Muscular fatigue was identified through the MVIC values decrease verification and median frequency (MF) of the EMG signals obtained after isometric exercise. The results demonstrated that while the strength was able to evidence muscular fatigue, the MF demonstrated in a statistically significant way the iliocostalis and multifidus muscles fatigue, and the multifidus muscles presented a higher muscular fatigue level. Interestingly, loads between 5% and 20% of the MVIC induced the same level of muscular fatigue. Thus, although the strength generated during vertebral column extension after isometric exercise-induced exhaustion remains unchanged, probably due to the action of accessory muscles, the overload on the vertebral column is developed as result of the vertebral column stability involvement resulting from the muscular fatigue identified after isometric exercise.

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Section: Discussionmentioning

confidence: 99%

Análise de parâmetros de força e resistência dos músculos eretores da espinha lombar durante a realização de exercício isométrico em diferentes níveis de esforço

Gonçalves

Barbosa

2005

Rev Bras Med Esporte

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“…In the present study, the back pain patients were physically active (as shown in the habitual physical activity indices) and were pain-free or in a minimal pain state during testing. In previous studies, back pain patients who were occupationally active exhibited no strength differences when compared with normal controls [24,28,44,53]. In addition, patients without acute back pain or pain-free at the time of testing were found to have similar isometric muscle strength with healthy subjects [26,59,65].…”

Section: Torque Outputmentioning

confidence: 99%

EMG activity of trunk muscles and torque output during isometric axial rotation exertion: a comparison between back pain patients and matched controls

Richardson

Parnianpour

et al. 2002

Journal Orthopaedic Research

139

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Abstract.4bnormal patterns of trunk muscle activity could aKect the biomechanics of spinal movements and result in back pain. The present study aimed to examine electromyographic (EMG) activity of abdominal and back muscles as well as triaxial torque output during isometric axial rotation at different exertion levels in back pain patients and matched controls. Twelve back pain patients and 12 matched controls performed isometric right and left axial rotation at 100%, 70%, 50%) and 30% maximum voluntary contractions in a standing position. Surface EMG activity of rectus abdominis, external oblique, internal oblique, latissimus dorsi, iliocostalis lumborum and multifidus were recorded bilaterally. The primary torque in the transverse plane and the coupling torques in sagittal and coronal planes were measured. Results showed that there was a trend ( P = 0.08) of higher flexion coupling torque during left axial rotation exertion in back pain patients. Higher activity for external oblique and lower activity for multifidus was shown during left axial rotation exertion in back pain group when compared to the control group. In right axial rotation, back pain patients exhibited lesser activity of rectus abdominis at higher levels of exertion when compared with matched controls. These findings demonstrated that decreased activation of one muscle may be compensated by overactivity in other muscles. The reduced levels of activity of the multifidus muscle during axial rotation exertion in back pain patients may indicate that spinal stability could be compromised. Future studies should consider these alternations in recruitment patterns in terms of spinal stability and internal loading. The findings also indicate the importance of training for coordination besides the strengthening of trunk muscles during rehabilitation process.

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“…The treatments applied to target these dysfunctions can be expensive, requiring individual treatment, specially trained therapists, and/or specialised equipment; if there is no evidence that specific exercises are actually required, then they represent an unnecessary drain on our limited health-care resources. If the observed alterations in the periphery, such as increased movement asymmetry and variability [27][28][29], reduced movement speed [30], increased muscle co-contraction [31,32], and decreased back muscle endurance [33][34][35], strength [33,35] and mobility [36] are compensatory rather than causative, then future research could be directed towards alternative (and perhaps less costly) intervention models with new approaches, e.g. strategies for re-training the cortical function [14,[37][38][39][40][41][42], hopefully generating more effective results in the treatment of cLBP.…”

Section: Introductionmentioning

confidence: 99%

Is a positive clinical outcome after exercise therapy for chronic non-specific low back pain contingent upon a corresponding improvement in the targeted aspect(s) of performance? A systematic review

et al. 2011

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Introduction The effect size for exercise therapy in the treatment of chronic non-specific low back pain (cLBP) is only modest. This review aims to analyse the specificity of the effect by examining the relationship between the changes in clinical outcome (pain, disability) and the changes in the targeted aspects of physical function (muscle strength, mobility, muscular endurance) after exercise therapy. Methods We searched for exercise therapy trials for cLBP published up to 15 April 2010 in Medline, Embase, Cochrane Library, Cinahl, and PEDro. Two independent reviewers selected studies according to the inclusion criteria. Data extraction: one author extracted the data of the articles. Results Data synthesis: 16 studies with a total of 1,476 participants met the inclusion criteria. There was little evidence supporting a relationship between the changes in pain or physical function and the changes in performance for the following measures: mobility (no correlation in 9 studies, weak correlation in 1 study), trunk extension strength (7 and 2, respectively), trunk flexion strength (4 and 1, respectively) and back muscle endurance (7 and 0, respectively). Changes in disability showed no correlation with changes in mobility in three studies and a weak correlation in two; for strength, the numbers were four (no correlation) and two (weak correlation), respectively. ConclusionsThe findings do not support the notion that the treatment effects of exercise therapy in cLBP are directly attributable to changes in the musculoskeletal system. Future research aimed at increasing the effectiveness of exercise therapy in cLBP should explore the coincidental factors influencing symptom improvement.

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Trunk extensor endurance: determination and relation to low-back trouble

Cited by 104 publications

References 9 publications

Análise de parâmetros de força e resistência dos músculos eretores da espinha lombar durante a realização de exercício isométrico em diferentes níveis de esforço

Análise de parâmetros de força e resistência dos músculos eretores da espinha lombar durante a realização de exercício isométrico em diferentes níveis de esforço

EMG activity of trunk muscles and torque output during isometric axial rotation exertion: a comparison between back pain patients and matched controls

Is a positive clinical outcome after exercise therapy for chronic non-specific low back pain contingent upon a corresponding improvement in the targeted aspect(s) of performance? A systematic review

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