Architecture-based force-velocity models of load-moving skeletal muscles

Baratta, R.; Solomonow, Moshe; Best, Russell; Zembo, M.; D’Ambrosia, Robert

doi:10.1016/0268-0033(95)93705-x

Cited by 13 publications

(10 citation statements)

References 29 publications

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“…8B, Hill's constant a had to be increased from 0.35 up to 0.55 (Table 2). This was well outside the ranges of values commonly reported in the literature (Baratta et al, 1995;Fitts et al, 1991), and therefore was perceived not to be a valid solution from the fitting routine. Thus, using a narrower force-length relationship forced us to use an inappropriate force-velocity relationship to preserve the model's fit to experimental data.…”

Section: Interaction Between Parametersmentioning

confidence: 80%

“…As a consequence, prior literature reporting suitable values for Hill constants based on whole muscle models (e.g. Baratta et al, 1995) must be interpreted in consideration with the force-length relationship assumed within the model.…”

Section: Length (%) Normalised Forcementioning

confidence: 99%

“…(6), Appendix A) vary with fibre type. Furthermore, there is substantial variation in the range of Hill constants that have been measured experimentally (Baratta et al, 1995). Muscles of SCI individuals are relatively homogeneous, comprising mostly Type II fibres (Crameri et al, 2000;Round et al, 1993).…”

Section: Force-velocity Relationshipmentioning

confidence: 99%

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Musculo-skeletal modelling of NMES-evoked knee extension in spinal cord injury

Sinclair

Davis

Smith

2006

Journal of Biomechanics

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Section: Interaction Between Parametersmentioning

confidence: 80%

Section: Length (%) Normalised Forcementioning

confidence: 99%

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Musculo-skeletal modelling of NMES-evoked knee extension in spinal cord injury

Sinclair

Davis

Smith

2006

Journal of Biomechanics

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“…2,5,9,13,21,[28][29][30][31]39 Muscle shortening and force are two important parameters associated with the mechanical properties of muscles, and are the fundamental measurements used to study muscle specimens in vitro, either in isometric or isotonic conditions. Isometric contraction is a situation where the muscle is stimulated and develops a force at a constant length; it is a useful test to determine parameters such as twitch force, tetanic force and contraction time (the time to reach the peak force after delivery of single electrical pulses).…”

Section: Introductionmentioning

confidence: 99%

Measuring Mechanical Properties, Including Isotonic Fatigue, of Fast and Slow MLC/mIgf-1 Transgenic Skeletal Muscle

2008

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Contractile properties of fast-twitch (EDL) and slow-twitch (soleus) skeletal muscles were measured in MLC/mIgf-1 transgenic and wild-type mice. MLC/mIgf-1 mice express the local factor mIgf-1 under the transcriptional control of MLC promoter, selectively activated in fast-twitch muscle fibers. Isolated muscles were studied in vitro in both isometric and isotonic conditions. We used a rapid "ad hoc" testing protocol that measured, in a single procedure, contraction time, tetanic force, Hill's (F-v) curve, power curve and isotonic muscle fatigue. Transgenic soleus muscles did not differ from wild-type with regard to any measured variable. In contrast, transgenic EDL muscles displayed a hypertrophic phenotype, with a mass increase of 29.2% compared to wild-type. Absolute tetanic force increased by 21.5% and absolute maximum power by 34.1%. However, when normalized to muscle cross-sectional area and mass, specific force and normalized power were the same in transgenic and wild-type EDL muscles, revealing that mIgf-1 expression induces a functional hypertrophy without altering fibrotic tissue accumulation. Isotonic fatigue behavior did not differ between transgenic and wild-type muscles, suggesting that the ability of mIgf-1 transgenic muscle to generate a considerable higher absolute power did not affect its resistance to fatigue.

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“…If the pennation angle is greater then the force generation of the whole muscle would be lower in the same muscle. Greater pennation angle would also result in a lower contraction velocity of the whole muscle because the difference between the directions of the force vector representing the muscle fibres and the whole muscle becomes greater (Baratta et al 1995). These architectural considerations suggest that maximal estimated velocity under L 50 (C 50 ) is lower than that under L 80 (C 80 ) experimental conditions.…”

Section: The M-x Characteristicsmentioning

confidence: 92%

Contraction history affects the in vivo quadriceps torque-velocity relationship in humans

Rácz

Béres

Hortobágyi

et al. 2002

European Journal of Applied Physiology

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We hypothesized that the history of contraction would affect the in vivo quadriceps torque-velocity relationship. We examined the quadriceps torque-velocity relationship of the human knee extensors at the descending and ascending limb of the torque-position relationship by initiating the knee extension at a knee angle position of 1.39 rad (80 degrees ) or 0.87 rad (50 degrees ) over a 0.52 rad (30 degrees ) range of motion under conditions of constant or linearly increasing velocity. Maximal voluntary isometric knee extension torque (M(0)) was measured at 1.87 rad, 0.87 rad, and 0.35 rad, and concentric torque was measured. The subjects carried out ten maximal knee extensions at ten distinct velocities, each velocity ranging between 0.52 rad x s(-1) to 5.24 rad x s(-1) in steps of 0.52 rad x s(-1). Peak concentric torque was measured and mean torque calculated from the respective torque-time curves. Peak or mean torque, computed from the individual torque-time curves, and velocity data were fitted to the Hill equation under the four experimental conditions and the curve parameters computed. The M(0) was similar at 0.87 rad and 1.39 rad, but it was significantly lower at 0.35 rad. In the low-velocity domain of the torque-velocity curve where a plateau normally occurs, peak torque was always lower than M(0). Peak and mean torque were significantly greater under linearly increasing velocity conditions and the 1.39 rad starting knee position. Mean torque but not peak torque data could be well fitted to the Hill equation and the two computations resulted in significantly different Hill curve parameters including the concavity ratio, peak power, and maximal angular velocity. We concluded that the history of contraction significantly modifies the in vivo torque-velocity relationship of the human quadriceps muscle. Muscle mechanics and not neural factors may have accounted for the inconsistencies in the human torque-velocity relationships reported previously.

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Architecture-based force-velocity models of load-moving skeletal muscles

Cited by 13 publications

References 29 publications

Musculo-skeletal modelling of NMES-evoked knee extension in spinal cord injury

Musculo-skeletal modelling of NMES-evoked knee extension in spinal cord injury

Measuring Mechanical Properties, Including Isotonic Fatigue, of Fast and Slow MLC/mIgf-1 Transgenic Skeletal Muscle

Contraction history affects the in vivo quadriceps torque-velocity relationship in humans

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