Disturbed paraspinal reflex following prolonged flexion-relaxation and recovery.

Abstract:

STUDY DESIGN:Repeated measures experimental study of the effect of flexion-relaxation, recovery, and gender on paraspinal reflex dynamics. OBJECTIVE:To determine the effect of prolonged flexion-relaxation and recovery time on reflex behavior in human subjects. SUMMARY OF BACKGROUND DATA:Prolonged spinal flexion has been shown to disturb the paraspinal reflex activity in both animals and human beings. Laxity in passive tissues of the spine from flexion strain may contribute to desensitization of mechanoreceptors. Animal studies indicate that recovery of reflexes may take up to several hours. Little is known about human paraspinal reflex behavior following flexion tasks or the recovery of reflex behavior following the flexion tasks. METHODS:A total of 25 subjects performed static flexion-relaxation tasks. Paraspinal muscle reflexes were recorded before and immediately after flexion-relaxation and after a recovery period. Reflexes were quantified from systems identification analyses of electromyographic response in relation to pseudorandom force disturbances applied to the trunk. RESULTS:Trunk angle measured during flexion-relaxation postures was significantly higher following static flexion-relaxation tasks (P < 0.001), indicating creep deformation of passive supporting structures in the trunk. Reflex response was diminished following flexion-relaxation (P < 0.029) and failed to recover to baseline levels during 16 minutes of recovery. CONCLUSION:Reduced reflex may indicate that the spine is less stable following prolonged flexion-relaxation and, therefore, susceptible to injury. The absence of recovery in reflex after a substantial time indicates that increased low back pain risk from flexion-relaxation may persist after the end of the flexion task.

journal_name

Spine (Phila Pa 1976)

journal_title

Spine

authors

Rogers EL,Granata KP

doi

10.1097/01.brs.0000206361.53451.c7

keywords:

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

839-45

issue

7

eissn

0362-2436

issn

1528-1159

pii

00007632-200604010-00019

journal_volume

31

pub_type

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