Related Experiment Video
Updated: Feb 3, 2026
11:12
Controlling Parkinson's Disease With Adaptive Deep Brain Stimulation
Published on: July 16, 2014
23.1K
Speed-adaptive control of functional electrical stimulation for dropfoot correction
Guangtao Chen1, Le Ma1, Rong Song2
1Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province, School of Engineering, Sun Yat-sen University, Guangzhou, Guang Dong, China.
Journal of Neuroengineering and Rehabilitation
|November 8, 2018
Summary
This study developed a speed-adaptive functional electrical stimulation (FES) system for dropfoot correction. The new FES system improves ankle dorsiflexion without worsening plantarflexion, offering a more natural gait for patients.
Area of Science:
- Biomechanics
- Rehabilitation Engineering
- Neuroscience
Background:
- Functional electrical stimulation (FES) is crucial for dropfoot correction.
- Optimizing FES requires synchronizing stimulation with tibialis anterior muscle activation for natural gait control.
Purpose of the Study:
- To investigate the relationship between walking speed and tibialis anterior activation timing and duration.
- To develop and evaluate a speed-adaptive FES system for dropfoot correction.
Main Methods:
- Recruited healthy subjects and individuals with dropfoot.
- Developed linear models relating walking speed to tibialis anterior activation parameters.
- Applied speed-adaptive FES and compared kinematic performance against heel-off triggered FES and no-stimulation conditions.
Main Results:
- Speed-adaptive FES significantly improved ankle dorsiflexion compared to no stimulation.
- For stroke patients, speed-adaptive FES maintained ankle plantarflexion similar to normal walking, unlike heel-off FES.
Conclusions:
- Speed-adaptive FES parameters enhance ankle dorsiflexion without adverse effects on plantarflexion.
- The proposed system offers a more physiologically appropriate and potentially valuable approach for clinical dropfoot correction.
Related Concept Videos
01:15Distance Corrections
290
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
290
01:21Transfer Function in Control Systems
1.6K
The transfer function is a fundamental concept in the analysis and design of linear time-invariant (LTI) systems. It offers a concise way to understand how a system responds to different inputs in the frequency domain. It serves as a bridge between the time-domain differential equations that describe system dynamics and the frequency-domain representation that facilitates easier manipulation and analysis.
To derive the transfer function, consider a general nth-order linear time-invariant...
To derive the transfer function, consider a general nth-order linear time-invariant...
1.6K
01:20Power Factor Correction
539
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
539
02:33Combinatorial Gene Control
9.7K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
9.7K
01:08Speed of Sound in Gases
4.1K
The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
4.1K
01:13Speed of a Transverse Wave
4.0K
The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
One of the key properties of any wave is the wave speed. Light...
4.0K