Improvements to Hoang et al.'s method for measuring passive length–tension properties of human gastrocnemius muscle in vivo

Nordez, Antoine; Fouré, Alexandre; Dombroski, Erik; Mariot, J.-P.; Cornu, Christophe; McNair, Peter

doi:10.1016/j.jbiomech.2009.07.034

Cited by 40 publications

(40 citation statements)

References 12 publications

(24 reference statements)

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“…sEMG and mechanical (T, h a and x) signals were sampled at 1,000 Hz using an A/D converter (National Instrument, Delsys Ò Inc, Boston, MA, USA) and stored on a hard drive using EMGWorks 3.1 software (Delsys Ò Inc, Boston, MA, USA) for further analysis. If during the passive measurements sEMG values were found to be greater than 1% of the maximal sEMG value determined during maximal voluntary contractions for a given subject, its data was disregarded for analysis (e.g., McNair et al 2001;Nordez et al 2008Nordez et al , 2009b.…”

Section: Range Of Motion and Passive Torque-angle Relationshipmentioning

confidence: 99%

“…Passive cyclic stretches are conventionally performed to obtain passive torque-angle relationships, from which the mechanical properties of the musculo-articular complex can be extracted (e.g., Magnusson 1998;Mahieu et al 2008;Nordez et al 2009a). Recently, a mathematical model developed by Hoang et al (2005) and improved by Nordez et al (2010) was used to assess passive force-length relationship of the gastrocnemii MTC.…”

Section: Introductionmentioning

confidence: 99%

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Effects of plyometric training on passive stiffness of gastrocnemii muscles and Achilles tendon

2011

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Plyometric training is commonly used to improve athletic performance; however, it is unclear how each component of the muscle-tendon complex (MTC) is affected by this intervention. The effects of 14 weeks of plyometric training on the passive stiffness of the gastrocnemii muscles and Achilles tendon was determined simultaneously to assess possible local adaptations of elastic properties. The passive force-length relationship of the gastrocnemii MTC and elongation of the gastrocnemii muscles were determined using ultrasonography during passive cyclic stretching in 19 subjects divided into trained (n = 9) and control (n = 10) groups. An upward trend in stiffness of the gastrocnemii MTC (P = 0.09) and a significant increase in the intrinsic gastrocnemii muscle stiffness were found (P < 0.05). In contrast, no significant change in gastrocnemii tendon stiffness, or in muscle and tendon geometry, was determined (P > 0.05). Considering the lack of change in gastrocnemii muscle geometry, the change in the gastrocnemii muscle stiffness may be mainly due to a change in the intrinsic mechanical properties of the muscular tissues.

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Section: Range Of Motion and Passive Torque-angle Relationshipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of plyometric training on passive stiffness of gastrocnemii muscles and Achilles tendon

2011

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“…This technique cannot isolate the behavior of one muscle and it is difficult to apply on pathologic subjects, due technical difficulties of performing the test on pathological subjects with high joint stiffness or bone deformities. Gastrocnemius muscle-tendon unit stiffness of the calf has also been evaluated using a numerical optimization from the measurement of the passive ankle torque depending on ankle angle (Hoang et al, 2005;Nordez et al, 2010). This elegant method provided low reliability for some parameters and cannot be used to evaluate only one given muscle.…”

Section: Introduction and Literaturementioning

confidence: 99%

Reliable Protocol for Shear Wave Elastography of Lower Limb Muscles at Rest and During Passive Stretching

Dubois¹,

Kheireddine²,

Vergari³

et al. 2015

Ultrasound in Medicine & Biology

111

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Accepted Manuscript. Ultrasound in Medicine and Biologyy. The original publication is available at www.sciencedirect.com. DOI: doi:10.1016/j.ultrasmedbio.2015.04.020.Development of shear wave elastography gave access to non-invasive muscle stiffness assessment in vivo. The aim of the present study was to define a measurement protocol to quantify the shear modulus of lower limb muscles in order to be used in clinical routine. Four positions were defined to evaluate shear modulus, parallel to the fibers, in the anterior and posterior aspect of the lower limb, at rest and during passive stretching, of 10 healthy subjects. Reliability was first evaluated on 2 muscles by 3 operators, measurements were repeated 6 times. Then, reliability comparison of different muscle was evaluated on 11 muscles by 2 operators, measurements repeated 3 times. Reproducibility of shear modulus was 0.48 kPa and repeatability was 0.41 kPa, with all muscles pooled. The position did not significantly influence the reliability. SWE appeared as an appropriate and reliable tool to evaluate shear modulus of lower limb muscles with the proposed protocol.

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“…[14][15][16] Three different mathematical models were fitted to the angle (θ)-torque (τ) data as previously described: [16][17][18][19][20][21][22][23][24][25][26][27] (i) Second-order polynomial (SOP) model (Equation 1)…”

Section: Discussionmentioning

confidence: 99%

Mechanical and neural changes in plantar-flexor muscles after spinal cord injury in humans

et al. 2015

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Study design: Cross-sectional study. Objectives: To determine the effect of injury duration on plantar-flexor elastic properties in individuals with chronic spinal cord injury (SCI) and spasticity. Setting: National Rehabilitation Center for Persons with Disabilities, Japan. Methods: A total of 16 chronic SCI patients (age, 33 ± 9.3 years; injury localization, C6-T12; injury duration, 11-371 months) participated. Spasticity of the ankle plantar-flexors was assessed using the Modified Ashworth Scale (MAS). The calf circumference and muscle thickness of the medial gastrocnemius (MG), lateral gastrocnemius and soleus were assessed using tape measure and ultrasonography. In addition, the ankle was rotated from 10°plantar-flexion to 20°dorsiflexion at 5 deg s −1 with a dynamometer, and the ankle angle and torque were recorded. After normalizing the data (the initial points of angle and torque were set to zero), we calculated the peak torque and energy. Furthermore, angle-torque data (before and after normalization) were fitted with a second-and fourth-order polynomial, and exponential (Sten-Knudsen) models, and stiffness indices (SI SOP, SI FOP, SI SK ) and Angle SLACK (the angle at which plantar-flexor passive torque equals zero) were calculated. The stretch reflex gain and offset were determined from 0-10°d orsiflexion at 50, 90, 120 and 150 deg s −1 . After logarithmic transformation, Pearson's correlation coefficients were calculated. Results: MAS, calf circumference, MG thickness, peak torque and SI FOP significantly decreased with injury duration (r loglog = − 0.63, − 0.69, − 0.63, − 0.53 and − 0.55, respectively, Po0.05). The peak torque and SI FOP maintained significant relationships even after excluding impacts from muscle morphology. Conclusion: Plantar-flexor elasticity in chronic SCI patients decreased with increased injury duration.

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Improvements to Hoang et al.'s method for measuring passive length–tension properties of human gastrocnemius muscle in vivo

Cited by 40 publications

References 12 publications

Effects of plyometric training on passive stiffness of gastrocnemii muscles and Achilles tendon

Effects of plyometric training on passive stiffness of gastrocnemii muscles and Achilles tendon

Reliable Protocol for Shear Wave Elastography of Lower Limb Muscles at Rest and During Passive Stretching

Mechanical and neural changes in plantar-flexor muscles after spinal cord injury in humans

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