ArticleJournal of neuroengineering and rehabilitation2021
Standardizing fatigue-resistance testing during electrical stimulation of paralysed human quadriceps muscles, a practical approach.
Article in Journal of neuroengineering and rehabilitation, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 17 citations in OpenAlex.
- Spatially distributed sequential stimulation applied to the paralyzed quadriceps muscles while performing motor-assisted FES cycling.Journal of neuroengineering and rehabilitation · 2025Trial
- Effects of multiple motor point stimulation on knee joint torque compared with conventional functional electrical stimulation.Biomedical engineering online · 2026Article
- Development and testing of range of motion driven motor unit recruitment device for knee rehabilitation: A randomized controlled trial.MethodsX · 2025Article
- Efficacy of high- versus moderate-intensity spatially distributed sequential stimulation in subjects with spinal cord injury: an isometric study.Journal of neuroengineering and rehabilitation · 2025Article
- A wearable functional electrical stimulation device with a movable electrode for motor point tracking.Frontiers in bioengineering and biotechnology · 2025Article
- Correlation and comparison of quadriceps endurance and knee joint position sense in individuals with and without unilateral knee osteoarthritis.BMC musculoskeletal disorders · 2022Article
- Toward a wearable monitor of local muscle fatigue during electrical muscle stimulation using tissue Doppler imaging.Wearable technologies · 2022Article
- Does increasing the number of channels during neuromuscular electrical stimulation reduce fatigability and produce larger contractions with less discomfort?European journal of applied physiology · 2021Article
- A Novel Framework for Quantifying Accuracy and Precision of Event Detection Algorithms in FES-Cycling.Sensors (Basel, Switzerland) · 2021Article
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Authors and funding
6 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundRapid onset of muscular fatigue is still one of the main issues of functional electrical stimulation (FES). A promising technique, known as distributed stimulation, aims to activate sub-units of a muscle at a lower stimulation frequency to increase fatigue-resistance. Besides a general agreement on the beneficial effects, the great heterogeneity of evaluation techniques, raises the demand for a standardized method to better reflect the requirements of a practical application.
methodsThis study investigated the fatigue-development of 6 paralysed quadriceps muscles over the course of 180 dynamic contractions, evaluating different electrode-configurations (conventional and distributed stimulation). For a standardized comparison, fatigue-testing was performed at 40% of the peak-torque during a maximal evoked contraction (MEC). Further, we assessed the isometric torque for each electrode-configuration at different knee-extension-angles (70°-170°, 10° steps).
resultsOur results showed no significant difference in the fatigue-index for any of the tested electrode-configurations, compared to conventional-stimulation. We conjecture that the positive effects of distributed stimulation become less pronounced at higher stimulation amplitudes. The isometric torque produced at different knee-extension angles was similar for most electrode-configurations. Maximal torque-production was found at 130°-140° knee-extension-angle, which correlates with the maximal knee-flexion-angles during running.
conclusionIn most practical applications, FES is intended to initiate dynamic movements. Therefore, it is crucial to assess fatigue-resistance by using dynamic contractions. Reporting the relationship between produced torque and knee-extension-angle can help to observe the stability of a chosen electrode-configuration for a targeted range-of-motion. Additionally, we suggest to perform fatigue testing at higher forces (e.g. 40% of the maximal evoked torque) in pre-trained subjects with SCI to better reflect the practical demands of FES-applications.
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