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Muscle Stimulation Frequency

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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Treating Low Back Pain in Failed Back Surgery Patients with Multicolumn-lead Spinal Cord Stimulation

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High frequency spinal cord stimulation-New method to restore cough.

K E Kowalski¹, J R Romaniuk², S W Brose³

¹Research Service, Louis Stokes Cleveland VA Medical Center, Cleveland, OH, USA; Department of Medicine, Case Western Reserve University, Cleveland, OH, USA; MetroHealth Research Institute, MetroHealth Medical Center, 2500 MetroHealth Drive, Cleveland, OH, USA.

Respiratory Physiology & Neurobiology

|July 11, 2016

Summary

High-frequency spinal cord stimulation (HF-SCS) effectively restores cough in spinal cord injury (SCI) patients. This method uses lower stimulus amplitudes, potentially avoiding pain fiber activation and improving safety.

Keywords:

Cough Expiratory muscles Rehabilitation Spinal cord stimulation

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Area of Science:

Neuromodulation
Respiratory Physiology
Spinal Cord Injury Rehabilitation

Background:

Spinal cord stimulation (SCS) at 50Hz aids cough restoration in spinal cord injury (SCI).
High stimulus amplitudes and pain fiber activation limit conventional SCS efficacy.
Investigating high-frequency SCS (HF-SCS) as a potentially safer alternative.

Purpose of the Study:

To test the hypothesis that HF-SCS can achieve comparable expiratory muscle activation with lower stimulus amplitudes.
To evaluate the effects of varying SCS frequencies and amplitudes on positive pressure (P) generation.

Main Methods:

Six dogs were used to assess SCS effects on positive pressure (P) generation.
Stimulus parameters including frequency (200-600Hz) and current (1mA) were varied.
Positive pressure (P) was measured to quantify expiratory muscle activation.

Main Results:

Mean P was highest at 500Hz across tested frequencies at a given stimulus current.
HF-SCS at 500Hz and 1mA produced P of 58±4 cmH2O, comparable to conventional SCS (61±5 cmH2O).
HF-SCS achieved similar P generation with significantly lower stimulus amplitudes.

Conclusions:

HF-SCS can generate effective expiratory muscle activation for cough restoration.
This approach may offer a safer alternative to conventional SCS by using lower stimulus amplitudes.
HF-SCS holds promise for restoring cough in SCI individuals, including those with intact sensation.