Abstract
Objective: To establish test-retest reliability of flexor carpi radialis (FCR) H-reflexes in non-disabled and stroke participants. We also investigated inter-limb differences and effects of chronicity post-stroke compared to non-disabled group and age-related effects in the non-disabled group. Methods: Sixteen chronic stroke and twenty-two non-disabled participants were recruited. Bilateral FCR H-reflexes were tested on two separate days by stimulating the median nerve and recording surface electromyography responses. FCR recruitment curves were plotted for H-reflex (H) and motor (M) waves and normalized as a percentage of maximal M-wave (ordinate) and motor threshold (abscissa). Statistics: Intraclass correlation coefficients [two-way mixed model-ICC (1, 2)], one-way ANOVA, Bland-Altman plots, standard error of measurement (SEM), and smallest real difference (SRD). Results: ICCs ranged from 0.55 to 0.95 (stroke) and 0.69-0.88 (non-disabled). SEM% (% of the mean) ranged from 9% to 24% (stroke) and 18-38% (non-disabled); SRD% ranged from 18% to 66% (stroke) and 6% to 50% (non-disabled). H-reflex amplitude and slope were greater in the paretic vs. non-paretic arm post-stroke (p= 0.07 and 0.01, respectively) and the paretic arm vs. non-disabled participants (p= 0.007 and 0.002, respectively). Stroke participants with longer chronicity (mean 9.4. years) revealed a significantly greater Hslp/Mslp on the paretic side compared to shorter chronicity (2.5. years; p= 0.05). Mean Hslp/Mslp was significantly greater in the young (mean 29. years) compared to the older group (62. years; p= 0.045). Conclusions: These results establish reliability of FCR H-reflexes in stroke and non-disabled participants. SEM and SRD measurements can be used to interpret recovery patterns and longitudinal effects of therapeutic interventions. Significance: FCR H-reflex amplitude and slope can be reliably measured and used to investigate neurophysiological mechanisms of motor recovery post-stroke.
Original language | English (US) |
---|---|
Pages (from-to) | 1606-1615 |
Number of pages | 10 |
Journal | Clinical Neurophysiology |
Volume | 123 |
Issue number | 8 |
DOIs | |
State | Published - Aug 1 2012 |
Externally published | Yes |
Keywords
- Recovery
- Reflex
- Reliability
- Stroke
- Upper-extremity
ASJC Scopus subject areas
- Clinical Neurology
- Neurology
- Physiology (medical)
- Sensory Systems