Abstract:
CONTEXT:Spinal-reflexive and corticomotor excitability may have a critical role in altering muscle function needed to stabilize the ankle in people with chronic ankle instability (CAI). OBJECTIVE:To determine the association between self-reported disability and both spinal-reflexive and corticomotor excitability in people with CAI. DESIGN:Descriptive laboratory study. SETTING:Research laboratory. PARTICIPANTS:30 participants with CAI. MAIN OUTCOME MEASURES:Soleus spinal-reflexive excitability was measured with normalized Hoffmann reflexes (H:M ratio), and corticomotor excitability was measured with transcranial magnetic stimulation and quantified by normalized motor-evoked-potential (MEP) amplitudes at 120% of active motor threshold (120%MEP). Self-reported disability was quantified with the activities-of-daily-living and sport subscales of the Foot and Ankle Ability Measure (FAAM-ADL and FAAM-S). Separate linear Pearson product-moment correlations and nonlinear quadratic correlations were used to determine associations between the neural-excitability and disability variables. RESULTS:Thirty participants were included in the spinal-reflexive-excitability analysis, while only 19 were included in the corticomotor analysis. There was a significant, weak linear association between H:M ratio and FAAM-ADL (R = .39, P = .03) and a nonsignificant, weak linear association between H:M ratio and FAAM-S (R = .36, P = .06). There were significant, moderate quadratic associations between H:M ratio and both FAAM-ADL (R = .48, P = .03) and FAAM-S (R = .50, P = .02). There was a significant, moderate linear association between 120%MEP and FAAM-ADL (R = -.48, P = .04) and a nonsignificant, moderate negative linear association between FAAM-S (R = -.42, P = .07). There was a significant, moderate quadratic association between 120%MEP and FAAM-ADL (R = .57, P = .046) and a significant, strong quadratic correlation between 120%MEP and FAAM-S (R = .71, P = .004). CONCLUSIONS:There are significant quadratic associations between self-reported disability and both spinal-reflexive and corticomotor excitability of the soleus. CAI participants with low or high neural excitability present with lower function.
journal_name
J Sport Rehabiljournal_title
Journal of sport rehabilitationauthors
Harkey M,McLeod MM,Terada M,Gribble PA,Pietrosimone BGdoi
10-1123/jsr.2014-0282subject
Has Abstractpub_date
2016-05-01 00:00:00pages
137-45issue
2eissn
1056-6716issn
1543-3072pii
2014-0282journal_volume
25pub_type
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