Response to Sudden Impact Loads
In the flow of everyday living, people sometimes experience
sudden and unanticipated forces, such as stepping
off a curb unexpectedly. An individual’s central nervous
Wilder et al. Trials 2011, 12:161
http://www.trialsjournal.com/content/12/1/161
Page 2 of 15
system is designed to deal with these challenges, or sudden
loads, to the system in such a way that minimal disruption
occurs to the individual’s current activities.
These sophisticated procedures include the rapid activation
of muscles to oppose the sudden load and the concurrent
relaxation of the corresponding antagonistic
muscles. It has been found that LBP patients respond
differently compared to healthy individuals [49-52]. It
takes their muscles longer to respond and their response
is smaller [53,54]. Several studies demonstrated that the
response of the trunk musculature is dependent on the
direction of perturbation [32,55-58]. There also appears
to be a correlation between muscle control delays in the
sudden load test and the increased postural sway in LBP
patients [59].
Response to Sudden Impact LoadsIn the flow of everyday living, people sometimes experiencesudden and unanticipated forces, such as steppingoff a curb unexpectedly. An individual’s central nervousWilder et al. Trials 2011, 12:161http://www.trialsjournal.com/content/12/1/161Page 2 of 15system is designed to deal with these challenges, or suddenloads, to the system in such a way that minimal disruptionoccurs to the individual’s current activities.These sophisticated procedures include the rapid activationof muscles to oppose the sudden load and the concurrentrelaxation of the corresponding antagonisticmuscles. It has been found that LBP patients responddifferently compared to healthy individuals [49-52]. Ittakes their muscles longer to respond and their responseis smaller [53,54]. Several studies demonstrated that theresponse of the trunk musculature is dependent on thedirection of perturbation [32,55-58]. There also appearsto be a correlation between muscle control delays in thesudden load test and the increased postural sway in LBPpatients [59].
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