Ligaments: a source of work-related musculoskeletal disorders

Solomonow, Moshe

doi:10.1016/j.jelekin.2003.09.011

Cited by 106 publications

(90 citation statements)

References 76 publications

(85 reference statements)

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“…Recently, this creep effect has been shown to elicit a 'disordering' of the neuromuscular reflex response and, coupled with the concomitant increase in connective tissue compliance and ligamentous laxity, has been interpreted as representing a major knee injury risk factor (Chu et al 2003;Solomonow, 2004). In is interesting to note that results from the current investigation, show an improvement in magneticallyevoked EMD following fatigue.…”

Section: Magnetically-evoked Neuromuscular Performancementioning

confidence: 54%

“…Sporting pursuits involving cyclical loading of viscoelastic tissue may contribute to increased injury risk because compliance characteristics and reflexive muscular activity may be adversely affected (Solomonow, 2004). However, the magnitude of the loading applied cyclically on viscoelastic tissue within the present study was probably low.…”

Section: Volitional Neuromuscular Performancementioning

confidence: 73%

“…Recent research has demonstrated that loading of viscoelastic structures in isolation can cause creep within the affected tissue and a modulation of the neuromuscular performance characteristics of the associated musculature (Chu et al 2003;Sbriccoli et al 2005;Solomonow, 2004;Solomnow et al 2003). For example, cyclical loading (150-200N) of the anterior cruciate ligament has been associated with an approximate 10% reduction in knee extensor peak force (Sbriccoli et al, 2005).…”

Section: Volitional Neuromuscular Performancementioning

confidence: 99%

“…The importance of this index of performance can be exemplified further by recognising that factors such as muscle fatigue can cause increases in EMD latency of up to 70% . The extent of this change in EMD performance may also be influenced by the loading of viscoelastic structures, which can cause creep within the affected tissue and a modulation of the neuromuscular performance characteristics of the associated musculature (Chu et al 2003;Sbriccoli et al, 2005;Solomonow, 2004;Solomonow et al 2003). Clearly, any fatigue-related increases in muscle response time within the knee flexors to initiate force, coupled with the effects of increased ligamentous laxity and compliance within muscle-related connective tissue associated with cyclical loading during activity, may result in a hyper-lax system that is more likely to be incapable of restraining high joint loads rapidly enough to prevent ligamentous injury.…”

Section: Introductionmentioning

confidence: 99%

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Effects of acute fatigue on the volitional and magnetically-evoked electromechanical delay of the knee flexors in males and females

et al. 2007

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Neuromuscular performance capabilities, including those measured by evoked responses, may be adversely affected by fatigue; however, the capability of the neuromuscular system to initiate muscle force rapidly under these circumstances is yet to be established. Sex-differences in the acute responses of neuromuscular performance to exercise stress may be linked to evidence that females are much more vulnerable to ACL injury than males. Optimal functioning of the knee flexors is paramount to the dynamic stabilisation of the knee joint, therefore the aim of this investigation was to examine the effects of acute maximal intensity fatiguing exercise on the voluntary and magnetically-evoked electromechanical delay in the knee flexors of males and females. Knee flexor volitional and magnetically-evoked neuromuscular performance was assessed in seven male and nine females prior to and immediately after: (i) an intervention condition comprising a fatigue trial of 30-seconds maximal static exercise of the knee flexors, (ii) a control condition consisting of no exercise. The results showed that the fatigue intervention was associated with a substantive reduction in volitional peak force (PF V ) that was greater in males compared to females (15.0%, 10.2%, respectively, p < 0.01) and impairment to volitional electromechanical delay (EMD V ) in females exclusively (19.3%, p < 0.05).Similar improvements in magnetically-evoked electromechanical delay in males and females following fatigue (21%, p < 0.001), however, may suggest a vital facilitatory mechanism to overcome the effects of impaired voluntary capabilities, and a faster neuromuscular response that can be deployed during critical times to protect the joint system.

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Section: Magnetically-evoked Neuromuscular Performancementioning

confidence: 54%

Section: Volitional Neuromuscular Performancementioning

confidence: 73%

Section: Volitional Neuromuscular Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of acute fatigue on the volitional and magnetically-evoked electromechanical delay of the knee flexors in males and females

et al. 2007

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“…The musculoskeletal system is able to respond to changes in the conditions of mechanical load 2,3,11,12 , and this functional and structural adaptation is already well understood to muscle and bone. However, little is known about the effects of exercise on ligaments 13 .…”

Section: Discussionmentioning

confidence: 99%

Avaliação dos ligamentos longitudinais da coluna de ratos Wistar em modelo experimental da terapia Suit

et al. 2016

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| Ligaments adapt according to the intensity of physical activity and mechanical load to which they are subjected. In the last decade there have been methods and protocols in the field of infant neurofunctional physiotherapy, which have the term "suit" in common, to characterize the existence of suits with adjustable elastic bands and the possibility of applying load on the human skeleton. Since the mechanical load can produce fibrocartilaginous changes on the ligaments and also that no studies evaluating the effect of suit therapy on ligaments of the spine were found, research with experimental methods of load are justified. The aim of this study was to analyze thickness and morphology of longitudinal ligaments of the spine of Wistar rats when subjected to mechanical load by vertebral compression. Thirty animals were separated into five groups (G1 -control; G2 -simulation of the use of suit; G3, G4, and G5 -maintenance of the suit). The suit experimental model, in G4 and G5, were adapted weights or elastic bands arranged in "X" for 50% of spinal overload of the weight of the animal, who remained with the suit for 40 hours over four weeks of experiment, five days a week.There were no significant differences for thickness, and morphological changes of longitudinal ligaments were also not observed. We concluded that there were no changes in longitudinal ligaments of the spine in animals subjected to the experimental model of suit therapy. RESUMEN | Pueden adaptarse los ligamentos a la intensidad de la actividad física y a la carga mecánica sometida a ellos. En la última década, han surgido métodos y protocolos en el área de fisioterapia neurofuncional infantil que tienen en común el término "suit" para caracterizar la existencia de ropas con bandas elásticas ajustables y la posibilidad de aplicación de cargas en el esqueleto humano. Debido a que la carga mecánica puede producir alteraciones fibrocartilaginosas en los ligamentos y que no han sido encontrados estudios que evaluaron el efecto de la terapia suit en los ligamentos de la columna vertebral, las investigaciones con métodos experimentales de carga son necesarias. Este estudio tiene el propósito de evaluar las espesuras y la morfología de los ligamentos longitudinales de la columna vertebral de ratas Wistar cuando sometida a carga mecánica por compresión vertebral. Se dividieron treinta ratas en cinco grupos (G1 -grupo control; G2 -simulación de la utilización del suit; G3, G4, G5 -mantenimiento de la ropa).Desde el modelo experimental del suit, en el G4 y G5 se adaptaron pesos o elásticos puestos en "X" para la sobrecarga vertebral de 50% del peso de los animales, los cuales permanecieron con la ropa durante cuarenta horas, al largo de cuatro semanas de experimento, en cinco días semanales. No fueron observadas diferencias significativas para la espesura, tampoco cambios morfológicos en los ligamentos longitudinales. Se concluye que no se observaron alteraciones en los ligamentos longitudinales de la columna vertebral de los animales sometidos al ...

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Basic Biomechanics and Workstation Design

Marras¹

2006

Handbook of Human Factors and Ergonomics

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Ligaments: a source of work-related musculoskeletal disorders

Cited by 106 publications

References 76 publications

Effects of acute fatigue on the volitional and magnetically-evoked electromechanical delay of the knee flexors in males and females

Effects of acute fatigue on the volitional and magnetically-evoked electromechanical delay of the knee flexors in males and females

Avaliação dos ligamentos longitudinais da coluna de ratos Wistar em modelo experimental da terapia Suit

Basic Biomechanics and Workstation Design

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