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Somatic Spinal Reflexes

Somatic Spinal Reflexes

Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...

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Ultrasound-derived Stretch Reflex Threshold Estimation Using Tendon-to-bone Distance During Tendon Tapping In Post-stroke Spasticity.

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Ultrasound-derived Stretch Reflex Threshold Estimation Using Tendon-to-bone Distance During Tendon Tapping In Post-stroke Spasticity.

Related Experiment Video

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

Published on: April 18, 2011

Ultrasound-Derived Stretch Reflex Threshold Estimation Using Tendon-to-Bone Distance During Tendon Tapping in

Seongyeon Yang, Matthieu K Chardon, Vaheh Nazari

IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society

|June 22, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

This study introduces an ultrasound method to measure stretch reflex thresholds (SRTs) in stroke survivors. This technique offers a practical and objective way to assess spasticity by tracking tendon displacement.

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Published on: June 12, 2019

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Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity

Published on: June 12, 2019

Area of Science:

Neuroscience
Biomedical Engineering
Rehabilitation Medicine

Background:

Objective assessment of spasticity after stroke is crucial for effective rehabilitation.
Current methods for measuring stretch reflex thresholds (SRTs) lack clinical practicality and structural interpretability.

Purpose of the Study:

To present and validate an ultrasound-derived method for quantifying SRTs.
To assess the clinical feasibility and reliability of this novel approach in individuals with chronic stroke.

Main Methods:

A custom device delivered controlled mechanical taps to the biceps tendon in 10 chronic stroke survivors.
Ultrasound tracked tendon-to-bone (T2B) displacement, alongside force and EMG recordings.
SRT was identified as the transition point in T2B reflex amplitude nonlinear-to-linear patterns.

Main Results:

The ultrasound T2B method successfully identified SRTs, correlating strongly with reflex force (r=0.86) and EMG (r=0.82).
T2B-based SRT estimates showed good within-session repeatability (CV=10.48 ± 10.06%).
Baseline T2B preload distance was associated with SRT, suggesting physiological insights.

Conclusions:

Ultrasound-based T2B displacement provides a practical, objective, and structurally interpretable measure of SRTs after stroke.
This method holds promise for improving spasticity assessment and guiding rehabilitation strategies.
Further research can explore the physiological implications of T2B preload distance on SRTs.