Improvement of isometric dorsiflexion protocol for assessment of tibialis anterior muscle strength

Siddiqi, Ariba; Arjunan, Sridhar P.; Kumar, Deepak

doi:10.1016/j.mex.2015.02.006

Cited by 15 publications

(15 citation statements)

References 17 publications

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“…The IMUs were placed on the Medial Gastrocnemius muscle (MG) and Tibialis Anterior (TA) muscles of the left and right legs as shown in Figure 1 and the positioning was based on the SENIAM recommendation [45]. The sensor placed in the TA muscle was used to compute the gait intervals, which was considered the best location to study gait events [46].…”

Section: Methodsmentioning

confidence: 99%

Which Gait Parameters and Walking Patterns Show the Significant Differences Between Parkinson’s Disease and Healthy Participants?

et al. 2019

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This study investigated the difference in the gait of patients with Parkinson’s disease (PD), age-matched controls and young controls during three walking patterns. Experiments were conducted with 24 PD, 24 age-matched controls and 24 young controls, and four gait intervals were measured using inertial measurement units (IMU). Group differences between the mean and variance of the gait parameters (stride interval, stance interval, swing interval and double support interval) for the three groups were calculated and statistical significance was tested. The results showed that the variance in each of the four gait parameters of PD patients was significantly higher compared with the controls, irrespective of the three walking patterns. This study showed that the variance of any of the gait interval parameters obtained using IMU during any of the walking patterns could be used to differentiate between the gait of PD and control people.

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Section: Methodsmentioning

confidence: 99%

Which Gait Parameters and Walking Patterns Show the Significant Differences Between Parkinson’s Disease and Healthy Participants?

et al. 2019

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“…The apparatus was developed in consultation with clinicians, and was developed to be MR‐safe, low cost, sturdy and easily constructed. The set‐up followed recommendations for accurate estimation of maximum voluntary contraction of the targeted tibialis anterior muscle through use of a strap placed tightly over the toes (Siddiqi et al, 2015). By introducing individualized resistance to a small amplitude movement, the task appears accessible to children with a wide range of abilities and provides a method to normalize subjective task difficulty.…”

Section: Discussionmentioning

confidence: 99%

“…This small, active movement range is available to most children with UCP (Nordmark et al, 2009). The participant's foot was secured to a hinged pedal using two padded Velcro straps, with one strap over the toes following recommendations for assessment of isolated tibialis anterior activation (Siddiqi et al, 2015). The heel was placed on a constructed ledge just above the hinge point.…”

Section: Methodsmentioning

confidence: 99%

Optimization of fMRI methods to determine laterality of cortical activation during ankle movements of children with unilateral cerebral palsy

Hilderley

Taylor

Chen

et al. 2018

Intl J of Devlp Neuroscience

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Measurement of laterality of motor cortical activations may provide valuable information about lower limb control in children with unilateral cerebral palsy (UCP). Evidence from upper limb research suggests that increased contralateral activity may accompany functional gains. However, lower limb areas of activation and associated changes have been underexplored due to challenges with imaging motor cortical leg representations. In this study, methods for a task-based functional magnetic resonance imaging (fMRI) ankle dorsiflexion paradigm were refined with three pilot groups of participants: (i) adults (n = 5); (ii) typically developing (TD) children (n = 5) and; (iii) children with UCP (n = 4). Parameters of experimental design, task resistance, reproducibility, and pre-scan procedures were tested/refined using a staged development approach with additions or changes introduced if image quality did not meet pre-defined standards. When image quality was acceptable for two consecutive participants, the next participant group was recruited to test/refine the next parameter. The final paradigm involved an event-related design of a single dorsiflexion movement against individualized resistance, with two runs per leg. It included a pre-scan session to increase child comfort and determine task resistance. This paradigm produced valid data for laterality index (LI) calculations to determine the ratio of activity in each hemisphere. Ventricle and lesion masks were used in non-linear image registration, and individual thresholds were used for extent-based LI calculations. LI of dominant ankle movements were contralateral (LI ≥ +0.2) for TD children (mean LI = +0.89, std = 0.27) and children with UCP (mean LI = +0.86, std = 0.26). For the affected ankle of children with UCP, LI values indicated ipsilateral and/or contralateral activation (mean LI = +0.02, std = 0.71, range -0.92 to +1.00). This fMRI paradigm will support investigations of cortical activation and mechanisms of skill improvement following lower limb interventions.

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“…The experimental procedures used in this study have been reported in our earlier studies. 31,26,56 Experimental protocol. This study protocol was approved by the 'RMIT University Human Research Ethics Committee' (SEHAPP 15751 (40/13)) and was carried out in accordance with the Declaration of Helsinki.…”

Section: Methodsmentioning

confidence: 99%

Implementation and experimental validation of surface electromyogram and force model of Tibialis Anterior muscle for examining muscular factors

Arjunan

Siddiqi

Swaminathan

et al. 2019

Proc Inst Mech Eng H

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This study reports a surface electromyogram and force of contraction model. The objective was to investigate the effect of changes in the size, type and number of motor units in the Tibialis Anterior muscle to surface electromyogram and force of dorsiflexion. A computational model to simulate surface electromyogram and associated force of contraction by the Tibialis Anterior muscle was developed. This model was simulated for isometric dorsiflexion, and comparative experiments were conducted for validation. Repeated simulations were performed to investigate the different parameters and evaluate inter-experimental variability. An equivalence statistical test and the Bland–Altman method were used to observe the significance between the simulated and experimental data. Simulated and experimentally recorded data had high similarity for the three measures: maximal power of power spectral density ( p < 0.0001), root mean square of surface electromyogram ( p < 0.0001) and force recorded at the footplate ( p < 0.03). Inter-subject variability in the experimental results was in-line with the variability in the repeated simulation results. This experimentally validated computational model for the surface electromyogram and force of the Tibialis Anterior muscle is significant as it allows the examination of three important muscular factors associated with ageing and disease: size, fibre type and number of motor units.

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Improvement of isometric dorsiflexion protocol for assessment of tibialis anterior muscle strength

Cited by 15 publications

References 17 publications

Which Gait Parameters and Walking Patterns Show the Significant Differences Between Parkinson’s Disease and Healthy Participants?

Which Gait Parameters and Walking Patterns Show the Significant Differences Between Parkinson’s Disease and Healthy Participants?

Optimization of fMRI methods to determine laterality of cortical activation during ankle movements of children with unilateral cerebral palsy

Implementation and experimental validation of surface electromyogram and force model of Tibialis Anterior muscle for examining muscular factors

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