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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

Somatic Spinal Reflexes

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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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Related Experiment Video

Updated: Oct 4, 2025

The Evoked Potential Operant Conditioning System EPOCS: A Research Tool and an Emerging Therapy for Chronic Neuromuscular Disorders
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Soleus H-reflex modulation during a double-legged drop landing task.

Mark A Lyle1, Michelle M McLeod2, Bridgette A Pouliot2

  • 1Division of Physical Therapy, Department of Rehabilitation Medicine, Emory University School of Medicine, 1441 Clifton Road, N.E. Room 205, Atlanta, GA, 30322, USA. mark.lyle@emory.edu.

Experimental Brain Research
|February 5, 2022
PubMed
Summary
This summary is machine-generated.

During drop landings, the soleus (SOL) H-reflex significantly decreases after ground contact. This reflex modulation helps prevent excessive muscle activation, facilitating proper joint stiffness.

Keywords:
Muscle spindleSensorimotorSpinal cordSpinal reflexStretch reflex

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Muscle spindle afferent feedback is crucial for locomotion.
  • H-reflex modulation during landing is not well understood.
  • Landing involves rapid muscle stretch and potential for overexcitation.

Purpose of the Study:

  • To investigate soleus (SOL) H-reflex modulation during the flight and early landing phases of drop landings.
  • To test the hypothesis that H-reflex size decreases near landing to prevent excessive motoneuron excitation.

Main Methods:

  • Recorded soleus H-reflexes during 30 cm drop landings in nine healthy adults.
  • Measured electromyography (SOL, TA, MG, VL), joint motion, and ground reaction forces.
  • Timed tibial nerve stimulation to elicit H-reflexes during specific flight and early ground contact intervals.

Main Results:

  • H-reflexes recorded 0-30 ms and 30-60 ms after landing were significantly smaller (21-36%) than during flight (90-0 ms before contact).
  • H-reflex reduction occurred after ground contact, indicating time-critical modulation.
  • This reduction suggests a neural strategy to manage reflex gain.

Conclusions:

  • H-reflex size is reduced after landing in drop jumps.
  • This modulation likely serves to prevent excessive reflex-mediated muscle activation.
  • The findings support a neural strategy for facilitating appropriate musculotendon and joint stiffness during landing.