Knee torque generation capacities modelled with physiological torque-angle-velocity relationships

Puchaud, Pierre; Dumont, Georges; Bideau, Nicolas; Pontonnier, Charles

doi:10.1080/10255842.2020.1714915

Cited by 1 publication

(2 citation statements)

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“…Additionally, muscle strength including EMG used for normalisation was assessed at 50 o flexion the angle at which the greatest force is produced [30][31][32]. While the previous literature uses 15 o 45 o , 55 o , 90 o [13,37,[41][42][43][44], or do not report the joint angle [27,[45][46][47].…”

Section: Discussionmentioning

confidence: 99%

“…45 o and 30 o knee flexion is the typical angle for strength testing due to its link between strength and functional performance [28] and least ligamentous strain [29] respectively. However, 50 o flexion is the angle at which the greatest force is produced [30][31][32]. The dynamometer lever arm was attached to the distal shank approximately an inch above the malleolus, aligned to the knee joint axis.…”

Section: Muscle Strength Testingmentioning

confidence: 99%

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Sex- and osteoarthritis-related differences in muscle co-activation during weight-bearing tasks

2020

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Background: Individuals with knee osteoarthritis (OA) demonstrate impairments in muscle function (i.e. muscle weakness, high muscle co-activation believed to have detrimental effects on joint integrity). Women with knee OA exhibit poorer health outcomes than men. Sex and muscle function are known risk factors for knee OA. It is unclear how these risk factors are associated with muscle function in knee OA and the implications for disease aetiology.Research question: How does sex and knee osteoarthritis disease status relate to muscle function, specifically strength and muscle co-activation, during walking, stair negotiation and sit-to-walk activities.Methods: A cross-sectional study assessed muscle co-activation in 77 individuals with knee OA (62.5[8.1]yrs; 48/29 women/men) and 18 age-matched controls (62.5[10.4]yrs; 9/9 women/men), during a series of walking, stair ascent and descent and sit-to-walk activities. Muscle strength of the knee extensors and flexors was assessed using maximal voluntary isometric contractions (MVIC).Electromyography was recorded from the vastus lateralis/medalis, rectus femoris, biceps femoris, semitendinosus, medial/lateral gastrocnemius normalised to MVIC. Multiple regression assessed the relationship between sex, disease status, and muscle strength on muscle co-activation.Results: Individuals with knee OA were weaker than controls, had higher hamstrings-quadriceps and medial-lateral co-activation for specific phases of gait. Women were weaker than men with higher muscle co-activation across all activities. Sex and muscle weakness, but not age or disease status predicted high muscle co-activation.Significance: High muscle co-activation was associated with female sex and muscle weakness regardless of disease status and age. High muscle co-activation is believed to be a compensatory mechanism for muscle weakness to maintain a certain level of function. High muscle co-activation is also thought to have detrimental effects on cartilage and joint integrity this may explain high muscle 4 co-activation in women with muscle weakness and contribute to increased risk of incidence and progression of knee OA in women.

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