1988 Volvo Award in Biomechanics: The Triaxial Coupling of Torque Generation of Trunk Muscles during Isometric Exertions and the Effect of Fatiguing Isoinertial Movements on the Motor Output and Movement Patterns

Parnianpour, Mohamad; Nordin, Margareta; Kahanovitz, Neil; Frankel, Victor H.

doi:10.1097/00007632-198809000-00004

Cited by 244 publications

(97 citation statements)

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“…Isoinertial dynamometric measures may offer a more standardised and controlled assessment of dynamic strength or power than do ''field tests'' of strength, in which the actual load being resisted is difficult to ascertain. A number of studies have shown that the velocity of trunk movement might be important in relation to LBP [37,38]. In an adult population, Marras et al showed that the velocity of movement during various trunk functional tests was one of the few parameters that was capable of distinguishing between groups of individuals with LBP and controls [16].…”

Section: Discussionmentioning

confidence: 99%

The association between isoinertial trunk muscle performance and low back pain in male adolescents

et al. 2009

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The literature reports inconsistent findings regarding the association between low back pain (LBP) and trunk muscle function, in both adults and children. The strength of the relationship appears to be influenced by how LBP is qualified and the means by which muscle function is measured. The aim of this study was to examine the association between isoinertial trunk muscle performance and consequential (non-trivial) low back pain (LBP) in male adolescents. Healthy male adolescents underwent anthropometric measurements, clinical evaluation, and tests of trunk range of motion (ROM), maximum isometric strength (STRENGTH) and peak movement velocity (VEL), using an isoinertial device. They provided information about their regular sporting activities, history and family history of LBP. Predictors of ''relevant/consequential LBP'' were examined using multivariable logistic regression. LBP status was reassessed after 2 years and the change from baseline was categorised. At baseline, 33/95 (35%) subjects reported having experienced consequential LBP. BMI, a family history of LBP, and regularly playing sport were each significantly associated with a history of consequential LBP (p \ 0.05). 85/95 (89%) boys participated in the follow-up: 51 (60%) reported no LBP at either baseline or follow-up (never LBP); 5 (6%) no LBP at baseline, but LBP at follow-up (new LBP); 19 (22%) LBP at baseline, but none at follow-up; and 10 (12%) LBP at both time-points (recurrent/persistent LBP). The only distinguishing features of group membership in these small groups were: fewer sport-active in the ''never LBP'' group); worse trunk mobility, in the ''persistent LBP'' group, lower baseline sagittal ROM in the ''never LBP'' and ''new LBP'' (p \ 0.05). Regular involvement in sport was a consistent predictor of LBP. Isoinertial trunk performance was not associated with LBP in adolescents.

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Section: Discussionmentioning

confidence: 99%

The association between isoinertial trunk muscle performance and low back pain in male adolescents

et al. 2009

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“…The B200 has a self-calibration sequence built into its software, and this procedure was carried out at the beginning of each testing day. The reliability of the B200 performance measurements has been previously reported by several investigators [6,15,19].…”

Section: Methodsmentioning

confidence: 60%

Relationships between isoinertial lumbar dynamometry parameters and demographic parameters in chronic low back pain patients

Hutten

Hermens

1998

European Spine Journal

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IntroductionInterest in developing isoinertial measurement techniques to evaluate the low back muscle function in patients with chronic low back pain has increased during the last few years. Patient performance is compared with standards estimated for healthy persons in order to gain insight into the low back muscle function. A problem inherent in muscle performance testing, however, is the large degree of intersubject variability. The absolute magnitude of force or velocity produced by individuals will vary according to different populations, depending on various factors, e.g. gender, age, weight and height. For example, the force exerted by a 60-year-old woman will be different from that expected for a 20-year-old man. The problem facing the clinician is interpretation of the obtained muscle performance. One way to handle this large intersubject variabilAbstract The purpose of this study was to investigate which demographic parameters are most important in relation to lumbar dynamometry performance in patients with chronic low back pain (LBP). Fortyfive chronic LBP patients participated in this study. Gender, age, weight and height were determined and a lumbar dynamometry measurement was carried out, using the Isostation B200. Student's t-test, ANOVA techniques and correlation coefficients were used to investigate the relationships between each demographic parameter and lumbar dynamometry performance. Stepwise multiple linear regression analyses were performed afterwards to determine which demographic parameters are most important in relation to lumbar dynamometry performance. Results indicate significant relationships (1) between gender, height, weight and all lumbar dynamometry parameters and (2) between age and three of the six isometric torque parameters. No significant relationship was found between age and maximum velocity parameters. Results of the stepwise multiple linear regression analyses show that the demographic parameters explain 27-47% of the variance in maximum isometric strength parameters and 19-25% of the variance in maximum velocity parameters. Gender is the most important demographic parameter, being related to nearly all maximum isometric torque parameters (percentage explained variance 6-37%) and height is the only important demographic parameter related to the velocity parameters (percentage explained variance 19-25%). Weight and age account for only a small amount of variance in lumbar dynamometry parameters (percentage explained variance 5-7%), meaning that these parameters are non-relevant predictors.

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“…But fatigue also poses other more subtle dilemmas for the spine system. Fatigue has been shown to impair spine proprioception (Taimela et al, 1999) and the ability to regulate force (Parnianpour et al, 1988;Sparto et al, 1997). Recently, we conducted an experiment that showed trunk muscle force variability increases after a fatiguing trial, and like others found that fatigue also produces more trunk muscle co-activation (O'Brien and Potvin, 1997;Potvin and O'Brien, 1998;Granata et al, 2004b).…”

Section: Controller Related Impairmentmentioning

confidence: 74%

Spine stability: The six blind men and the elephant

Reeves

Narendra

Cholewicki

2007

Clinical Biomechanics

214

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Stability is one of the most fundamental concepts to characterize and evaluate any system. This term is often ambiguously used in spinal biomechanics. Confusion arises when the static analyses of stability are used to study dynamic systems such as the spine. Therefore, the purpose of this paper is to establish a common ground of understanding, using standard, well-defined terms to frame future discussions regarding spine dynamics, stability, and injury. A qualitative definition of stability, applicable to dynamic systems, is presented. Additional terms, such as robustness (which is often confused with stability) and performance are also defined. The importance of feedback control in maintaining stability is discussed. Finally, these concepts are applied to understand low back pain and risk of injury.

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1988 Volvo Award in Biomechanics: The Triaxial Coupling of Torque Generation of Trunk Muscles during Isometric Exertions and the Effect of Fatiguing Isoinertial Movements on the Motor Output and Movement Patterns

Cited by 244 publications

References 0 publications

The association between isoinertial trunk muscle performance and low back pain in male adolescents

The association between isoinertial trunk muscle performance and low back pain in male adolescents

Relationships between isoinertial lumbar dynamometry parameters and demographic parameters in chronic low back pain patients

Spine stability: The six blind men and the elephant

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