Transcranial Direct Current Stimulation for Neuromuscular Fatigue
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Solution Overview
Problem
Current methods for reducing neuromuscular fatigue caused by exercise often involve drugs with adverse side effects and addiction risks, and existing non-pharmacological approaches are not effective in improving muscle endurance.
Innovation Solution
Anodal trans-cranial direct current stimulation is applied over the motor cortical areas of the scalp using an anodal electrode, with a cathodal electrode placed on the body, delivering a low-intensity direct current to manipulate brain excitability and reduce muscle fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drugs are used to reduce neuromuscular fatigue, then fatigue reduction is achieved, but addiction and adverse side effects occur
Solution Approach 1:
The patent replaces pharmacological intervention with a physical stimulation method (trans-cranial direct current stimulation). Instead of using chemical substances that act on the nervous system, the invention uses electrical current to directly stimulate the motor cortex, thereby substituting a mechanical/physical system for a chemical one to eliminate addiction and side effect risks while maintaining fatigue reduction effectiveness
Solution Approach 2:
The patent introduces an intermediary mechanism (electrical stimulation of the motor cortex) between the goal of fatigue reduction and the actual muscle performance. Rather than directly affecting muscles or using drugs that systemically impact the body, the invention uses tDCS as an intermediary to modulate cortical excitability, which then indirectly influences muscle fatigue resistance through neural pathways
2Reliability
If simple training is applied to retard fatigue perception, then fatigue perception is reduced, but muscle endurance is not significantly improved
Solution Approach 1:
The patent applies preliminary action by stimulating the motor cortex before exercise begins. The tDCS protocol is administered prior to physical activity to pre-modulate cortical excitability and neuronal recruitment patterns, thereby preparing the nervous system for enhanced endurance performance before the actual exercise stress occurs
Solution Approach 2:
The patent changes the parameter of cortical excitability through electrical stimulation. By applying anodal tDCS, the invention increases the excitability of the motor cortex, which alters neural recruitment patterns and motor unit activation during exercise, thereby extending muscle endurance beyond what simple training alone can achieve
3Ease of operation
If cathodal trans-cranial direct current stimulation is applied, then brain polarization is achieved, but no appreciable effect on fatigue reduction is observed
Solution Approach 1:
The patent applies inversion by reversing the polarity of the electrical stimulation. Instead of using cathodal stimulation (negative electrode over motor cortex), the invention employs anodal stimulation (positive electrode over motor cortex), which has the opposite effect of increasing cortical excitability rather than decreasing it, thereby achieving the desired fatigue reduction effect
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly decreases muscle fatigue and improves muscle endurance by prolonging endurance time during submaximal isometric tasks, with minimal side effects and no addiction risks, as demonstrated in experimental trials.
Implementation Method 1
An anodal trans-cranial direct current stimulation is a process of electric stimulation of a cortical region of a person's scalp with an anodal direct current of low intensity
Implementation Method 2
The direct current intensity is chosen between 0.5 to 5 mA in order to polarise the brain
Data Source
AI summary
A process for reducing neuromuscular fatigue caused by exercise comprises applying an anodal trans-cranial direct current stimulation over the right motor cortex of a person.