Estimation of muscle forces in gait using a simulation of the electromyographic activity and numerical optimization

Ravera, Emiliano Pablo; Crespo, Marcos; Braidot, Ariel

doi:10.1080/10255842.2014.980820

Cited by 12 publications

(6 citation statements)

References 32 publications

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“…40 Indeed, previous studies have reported that people with MS have greater variability in gait mechanics compared with controls, [41][42][43] and, therefore, the variability in the magnitude of adaptations measured in the present study may reflect differences in lower limb muscle activation and gait mechanics among participants. Although studies using electromyography have demonstrated reduced gastrocnemius activation during push-off compared with controls, 41,44 the improvement in oxidative capacity observed in the present study suggests that the voluntary activation of the gastrocnemius muscle during the antigravity treadmill training was sufficient to initiate the biochemical pathways required for mitochondrial biogenesis. 45 Reductions in muscle oxidative capacity may be related to walking dysfunction in people with MS, 7,13,40 and the present findings lend support to the use of antigravity treadmill training in interventions aiming to improve muscle oxidative metabolism in people with MS who have significant walking impairments.…”

Section: Discussioncontrasting

confidence: 73%

Effects of Treadmill Training on Muscle Oxidative Capacity and Endurance in People with Multiple Sclerosis with Significant Walking Limitations

Willingham¹,

Melbourn²,

Moldavskiy³

et al. 2019

International Journal of MS Care

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Background: Exercise can improve muscle function and mobility in people with multiple sclerosis (MS). However, the effects of exercise training on skeletal muscle oxidative capacity and endurance in people with MS remain unclear, and few studies have evaluated muscle plasticity in people with MS who have moderate-to-severe disability. The present study evaluated the effects of treadmill training on muscle oxidative capacity and muscle endurance and examined the relationship to walking function in people with MS who have moderate-to-severe disability. Methods: Six adults (mean ± SD age, 50 ± 4.9 years) with MS (Expanded Disability Status Scale score, 6.0–6.5) performed treadmill training for 24 minutes approximately twice per week for approximately 8 weeks (16 sessions total) using an antigravity treadmill system. The following measures were taken before and after the intervention phase: muscle oxidative capacity in the medial gastrocnemius using near-infrared spectroscopy after 15 to 20 seconds of electrical stimulation; muscle endurance in the medial gastrocnemius using accelerometer-based mechanomyography during 9 minutes of twitch electrical stimulation in three stages (3 minutes per stage) of increasing frequency (2, 4, and 6 Hz); and walking function using the 2-Minute Walk Test. Results: Mean ± SD muscle oxidative capacity increased from 0.64 ± 0.19 min−1 to 1.08 ± 0.52 min−1 (68.2%). Mean ± SD muscle endurance increased from 80.9% ± 15.2% to 91.5% ± 4.8% at 2 Hz, from 56.3% ± 20.1% to 76.6% ± 15.8% at 4 Hz, and from 29.2% ± 13.1% to 53.9% ± 19.4% at 6 Hz of stimulation in the gastrocnemius. There were no significant improvements in walking function. Conclusions: Treadmill training can improve muscle oxidative capacity and endurance in people with MS who have moderate-to-severe levels of disability.

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Section: Discussioncontrasting

confidence: 73%

Effects of Treadmill Training on Muscle Oxidative Capacity and Endurance in People with Multiple Sclerosis with Significant Walking Limitations

Willingham¹,

Melbourn²,

Moldavskiy³

et al. 2019

International Journal of MS Care

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“…The magnitude of knee and ankle JCF in our study was relatively higher than those reported in walking. The reason could be that EMG signal was supplemented to the modeling in our study to account for muscle physiology and co-contraction, while some other studies may underestimate the joint loading based on a purely mathematical solution [ 46 ]. Our results showed that JCF was similar across the three conditions, except that peak ankle JCF in the shear direction was higher in flip-flops than sports shoes.…”

Section: Discussionmentioning

confidence: 99%

Lower limb muscle co-contraction and joint loading of flip-flops walking in male wearers

Chen

Wong

et al. 2018

PLoS ONE

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Flip-flops may change walking gait pattern, increase muscle activity and joint loading, and predispose wearers to foot problems, despite that quantitative evidence is scarce. The purpose of this study was to examine the lower limb muscle co-contraction and joint contact force in flip-flops gait, and compare with those of barefoot and sports shoes walking. Ten healthy males were instructed to perform over-ground walking at self-selected speed under three footwear conditions: 1) barefoot, 2) sports shoes, and 3) thong-type flip-flops. Kinematic, kinetic and EMG data were collected and input to a musculoskeletal model to estimate muscle force and joint force. One-way repeated measures ANOVA was conducted to compare footwear conditions. It was hypothesized that flip-flops would induce muscle co-contraction and produce different gait kinematics and kinetics. Our results demonstrated that the musculoskeletal model estimation had a good temporal consistency with the measured EMG. Flip-flops produced significantly lower walking speed, higher ankle and subtalar joint range of motion, and higher shear ankle joint contact force than sports shoes (p < 0.05). There were no significant differences between flip-flops and barefoot conditions in terms of muscle co-contraction index, joint kinematics, and joint loading of the knee and ankle complex (p > 0.05). The variance in walking speed and footwear design may be the two major factors that resulted in the comparable joint biomechanics in flip-flops and barefoot walking. From this point of view, whether flip-flops gait is potentially harmful to foot health remains unclear. Given that shod walking is more common than barefoot walking on a daily basis, sports shoes with close-toe design may be a better footwear option than flip-flops for injury prevention due to its constraint on joint motion and loading.

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“…Lately, biomechanical analysis of the human locomotor system by applying rigid-body musculoskeletal models has strongly increased in the research community with the primary objective of analyzing the influence of muscle activations for different body movements. [3][4][5][6] At the same time, FE method has emerged as a complementary approach (in both in vivo and in vitro studies) for analyzing the mechanical behavior of joints, muscles and skeletal tissues. [7][8][9][10] These computational models can provide estimates of stress and strain data over the entire area of interest, which becomes especially advantageous for locations where it may be difficult or impossible to obtain experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

Ravera

Crespo

Formento

2018

Proc Inst Mech Eng H

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Analysis of the human locomotor system using rigid-body musculoskeletal models has increased in the biomechanical community with the objective of studying muscle activations of different movements. Simultaneously, the finite element method has emerged as a complementary approach for analyzing the mechanical behavior of tissues. This study presents an integrative biomechanical framework for gait analysis by linking a musculoskeletal model and a subject-specific finite element model of the pelvis. To investigate its performance, a convergence study was performed and its sensitivity to the use of non-subject-specific material properties was studied. The total hip joint force estimated by the rigid musculoskeletal model and by the finite element model showed good agreement, suggesting that the integrative approach estimates adequately (in shape and magnitude) the hip total contact force. Previous studies found movements of up to 1.4 mm in the anterior-posterior direction, for single leg stance. These results are comparable with the displacement values found in this study: 0-0.5 mm in the sagittal axis. Maximum von Mises stress values of approximately 17 MPa were found in the pelvic bone. Comparing this results with a previous study of our group, the new findings show that the introduction of muscular boundary conditions and the flexion-extension movement of the hip reduce the regions of high stress and distributes more uniformly the stress across the pelvic bone. Thus, it is thought that muscle force has a relevant impact in reducing stresses in pelvic bone during walking of the finite element model proposed in this study. Future work will focus on including other deformable structures, such as the femur and the tibia, and subject-specific material properties.

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Estimation of muscle forces in gait using a simulation of the electromyographic activity and numerical optimization

Cited by 12 publications

References 32 publications

Effects of Treadmill Training on Muscle Oxidative Capacity and Endurance in People with Multiple Sclerosis with Significant Walking Limitations

Effects of Treadmill Training on Muscle Oxidative Capacity and Endurance in People with Multiple Sclerosis with Significant Walking Limitations

Lower limb muscle co-contraction and joint loading of flip-flops walking in male wearers

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

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