Contractile behaviour in skeletal muscle-tendon unit during small amplitude sine wave perturbations

Ettema, Gertjan

doi:10.1016/0021-9290(96)00014-0

Cited by 10 publications

(10 citation statements)

References 19 publications

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“…From the same experiments, passive force levels were obtained prior to activation, with data ®tted according to (2). CE force±velocity characteristics were determined by applying isokinetic contractions with speeds varying from )60 mm s )1 to +8 mm s )1 Ettema 1996). The force levels during the middle of the shortening period (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…For each contraction the isometric force was measured before onset of the 210-Hz vibrations. These data, corrected for series elastic elongation, yielded the length±force characteristics of the CE (Ettema 1996). The force±stiness data and length±force data were ®tted according to (1) and (3), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Short-amplitude contractile behaviour (with little or no myo®lament sliding) is dissimilar from large-amplitude movement behaviour (e.g. Ettema 1996). Furthermore, Kawai and Brandt (1980) presented a model in the Laplace domain which responded to a step input as the sum of three exponentials.…”

Section: Short Duration Vs Long Duration Eectsmentioning

confidence: 97%

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Muscle contraction history: modified Hill versus an exponential decay model

Ettema

Meijer

2000

Biological Cybernetics

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In recent years, it has been recognised that improvements to classic models of muscle mechanical behaviour are often necessary for properly modelling coordinated multi-joint actions. In this respect, the purpose of the present study was to improve on modelling stretch-induced force enhancement and shortening-induced force depression of muscle contraction. For this purpose, two models were used: a modified Hill model and a model based loosely on mechano-chemistry of the cross-bridge cycle (exponential decay model). The models were compared with a classic Hill modeland experimental data. Parameter values were based, as much as possible, on experimental findings in the literature, and tested with new experiments on the gastrocnemius of the rat. Both models describe many features of slow-ramp movements well during short contractions (300-500 ms), but long-duration behaviour is described only partly. The exponential decay model does not incorporate a force-velocity curve. Therefore, its good performance indicates that the status ofthe classic force-velocity characteristic may have to be reconsidered. Like movement-induced force depression and enhancement, it seems a particular manifestation of time-dependent force behaviour of muscle, rather than a fundamental property of muscle (like the length-tension curve). It is argued that a combination of the exponential decay model (or other models based on the mechano-chemistry of contraction) and structurally based models may be fruitful in explaining this time-dependent contraction behaviour. Furthermore, not in the least because of its relative simplicity, the exponential decay model may prove more suitable for modelling multi-joint movements than the Hill model.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Muscle contraction history: modified Hill versus an exponential decay model

Ettema

Meijer

2000

Biological Cybernetics

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“…At these velocities, over very short distances (1.49-3.95 mm) human muscle has been shown to produce significantly more force than concentric contractions during eccentric contractions [13]. However Ettema [19] has shown that due to series elastic component-contractile element interaction, isokinetic and isotonic force-velocity curves are poor predictors of muscle-tendon performance ability during locomotor or sinusoidal movements. It is therefore possible that under the conditions of this experiment (high load and high velocity over a large range of motion) the eccentric loading of the elbow flexors does not react as would be expected and that the force-velocity curve should have a descending slope.…”

Section: Ssc Workmentioning

confidence: 98%

“…Numerous studies have been performed using muscle specimens and isolated muscles stimulated supra-maximally under differing contraction conditions in order to quantify this phenomenon [37,38,18,19]. However, only a limited number of studies have been performed on humans to investigate this phenomenon, under conditions that can relate the findings directly to neuromuscular mechanisms [25,4].…”

Section: Introduction and Review Of Literaturementioning

confidence: 98%

In vivo assessment of elbow flexor work and activation during stretch-shortening cycle tasks

Benoit

Dowling

2006

Journal of Electromyography and Kinesiology

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Contractile behaviour in skeletal muscle-tendon unit during small amplitude sine wave perturbations

Cited by 10 publications

References 19 publications

Muscle contraction history: modified Hill versus an exponential decay model

Muscle contraction history: modified Hill versus an exponential decay model

In vivo assessment of elbow flexor work and activation during stretch-shortening cycle tasks

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