Balanced, Electroencephalography, Electromyography
Conditions
Keywords
Center of pressure, Electroencephalography, Electromyography, H reflex, Electrical noise stimulation
Brief summary
Noise stimulation had an immediate effect on improving balance control. The present study aimed to clarify the immediate neuromuscular adaptation induced by noise stimulation and find the correlation between neuromuscular adaptation and functional performance.
Detailed description
The mechanism behind noise stimulation is called Stochastic Resonance which improves the detectivity of sensory input with the presence of noise, making sub-sensory threshold input detectable. Noise stimulation had been proved to improve postural control, Ia afferent sensitivity, and muscle activity of the tibialis anterior. With this evidence of the effect of noise stimulation on balance enhancement, the neuromuscular adaptation induced by noise stimulation has not been researched yet. Therefore, the present study aims to clarify the immediate effect of noise on neuromuscular regulation during postural control.
Interventions
DEVICEelectrical noise stimulation
The intensity of electrical noise stimulation will be set at 90% of the sensory threshold of each participant.
DEVICESham stimulation
Participants will not receive stimulation.
DEVICEFoam
The foam will be used to make an unstable surface.
Sponsors
National Yang Ming Chiao Tung University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
SINGLE (Subject)
Masking description
The stimulation intensity is set under the sensory threshold, therefore participants will be masked in the study.
Eligibility
Sex/Gender
ALL
Age
20 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* age between 20 and 40 years old * without ankle injury history in 1 year * without musculoskeletal or neurological diseases that would affect balance performance * without visual impairment (except vision correction or no visual problems) * without vestibular impairment.
Exclusion criteria
* subject who cannot tolerate the cutaneous electrical stimulation to induce H reflex * single-leg stance (SLS) without support is shorter than 80 secs
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Mean sway path of the center of pressure | 40 seconds under each condition | The mean sway path in mm will represent balance performance |
| Mean sway velocity of the center of pressure | 40 seconds under each condition | The mean sway velocity in mm/sec will represent balance performance |
| Cortical excitability | 40 seconds under each condition | Power spectrum density of EEG will calculated for representing cortical excitability. |
| Spinal reflex excitability | 40 seconds under each condition | H reflex amplitude will represent the excitability of peripheral control from spinal level nerve system. |
| Co-activation index | 40 seconds after each condition | Co-activation index will be calculated by EMG activity of Tibialis Anterior and Soleus muscle to represent the muscle activity. |
Countries
Taiwan
Outcome results
None listed