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Related Concept Videos

Reflex Activity01:08

Reflex Activity

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A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
A reflex exam is a diagnostic procedure performed by a healthcare professional to evaluate the functionality of a patient's...
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Somatic Spinal Reflexes01:22

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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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Experimental Methods to Study Human Postural Control
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Motion analysis of normal patellar tendon reflex.

Lai Kuan Tham, Noor Azuan Abu Osman, Wan Abu Bakar Wan Abas

    The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
    |November 22, 2013
    PubMed
    Summary

    This study quantified patellar tendon reflex (PTR) using motion analysis, establishing normal values and identifying factors influencing reflex amplitude. Findings show objective quantification of deep tendon reflexes is feasible.

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    Area of Science:

    • Neurology
    • Biomechanics
    • Motor System Assessment

    Background:

    • Current reflex assessment relies on qualitative descriptions, lacking normative data for healthy individuals.
    • Objective quantification of the motor system's essential reflex assessment is needed.

    Purpose of the Study:

    • To quantitatively assess patellar tendon reflex (PTR) amplitude and latency in healthy subjects.
    • To establish normative data for PTR using motion analysis.
    • To identify factors influencing PTR amplitude.

    Main Methods:

    • 100 healthy volunteers participated in PTR assessments.
    • A motion analysis system recorded reflex responses.
    • Varying input strengths were applied to elicit reflexes.

    Main Results:

    • A linear relationship was observed between reflex input and amplitude (r = 0.50, P <0.001).
    • The left knee showed significantly higher reflex amplitude (26.3%) than the right (P <0.001).
    • The Jendrassik maneuver increased reflex amplitude by 34.3% (P = 0.001), particularly in those with weaker responses.
    • Reflex latency decreased with increasing input strength.

    Conclusions:

    • The developed method offers objective quantification of deep tendon reflexes.
    • Quantitative normative data for PTR were established.
    • Motion analysis provides a valuable tool for assessing reflex responses.