Relationships between Heart Rate Variability, Motor Impairments and Level of disability in Chronic Ischemic Stroke Patients
Keywords:
Heart Rate Variability, Ischemic Stroke, Motor Impairment, DisabilityAbstract
Background and objective: Alteration in the autonomic cardiovascular control that is measured by heart rate variability (HRV) is associated with motor impairments of acute chronic stroke patients. The purposes of this study was to investigate the association between cardiac autonomic function, motor impairments and disability level in chronic ischemic stroke patients.
Methods: Thirteen participants aged between 40-75 years old, suffered from stroke for 6 months to 5 years, were able to stand for at least 5 minute and could follow 2 steps command were recruited in to the study. Participant were evaluated HRV for 20 mins in supine resting position. Upper and lower extremities motor impairments and level of disability were assessed by Fugl-Meyer assessment (FMA) and modified Rankin Scale (mRS), respectively. Spearman’s correlation coefficients were used to investigate the association between outcome measures. Differences were considered statistically significant at p < 0.05.
Result: The results showed a moderate positive and significant correlation between upper extremity impairment (FMA-UEs) and LF (nu) (r = 0.622; p = 0.02), and LF/HF ratio (r = 0.561; p = 0.04). Furthermore, there was a strong negative and significant correlations between mRS and LF (nu) (r = -0.855; p < 0.001), and LF/HF ratio (r = -0.711; p = 0.006).
Conclusion: HRV of chronic ischemic stroke is associated with motor impairments and level of disability.
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