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Reflex Activity

Reflex Activity

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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Related Experiment Video

Updated: Jun 6, 2026

A Passive Ankle Dorsiflexion Testing System for an In Vivo Model of Overuse-induced Tendinopathy

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Investigation to predict patellar tendon reflex using motion analysis technique.

L K Tham¹, N A Abu Osman, K S Lim

¹Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia. laikuan tam@hotmail.com

Medical Engineering & Physics

|December 15, 2010

Summary

This summary is machine-generated.

This study introduces motion analysis for objective patellar tendon reflex assessment. Female subjects exhibited greater reflex responses than males, with tapping strength significantly influencing hyper-reflex.

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Area of Science:

Biomechanics
Neuroscience
Clinical Diagnostics

Background:

The patellar tendon reflex is a fundamental neurological response.
Current clinical assessment methods for reflexes can be subjective.
Objective, quantitative measures are needed for precise reflex evaluation.

Purpose of the Study:

To explore alternative, objective methods for assessing the patellar tendon reflex.
To utilize motion analysis techniques for quantitative reflex measurement.
To investigate factors influencing patellar tendon reflex responses.

Main Methods:

Development of a specialized reflex hammer holder.
Collection of kinematic data using a motion analysis system.
Elicitation of hypo-, normal-, and hyper-reflexes, including the Jendrassik maneuver.

Main Results:

Motion analysis provided objective, quantitative data on patellar tendon reflex responses.
Female subjects demonstrated generally greater reflex responses compared to males.
Increased tapping strength significantly enhanced the knee-jerk response for hyper-reflexes.

Conclusions:

Motion analysis offers a viable, objective approach to assessing the patellar tendon reflex in clinical settings.
Gender influences patellar tendon reflex response magnitude.
Tapping intensity is a critical factor in eliciting exaggerated reflexes.