title: Reliability of near-infrared spectroscopy measures of cerebral oxygenation and blood volume during handgrip exercise in nondisabled and traumatic brain-injured subjects.
abstract: We compared the test-retest reliability of near-infrared spectroscopy (NIRS) measures of cerebral oxygenation and blood volume during a rhythmic handgrip exercise in 13 nondisabled subjects and 25 subjects with moderate to severe traumatic brain injury (TBI). Subjects with TBI (average Glasgow Coma Scale score = 4.2, average time since injury = 21 mo) had completed an acute brain injury rehabilitation program. After 2 min of rest, each subject performed 60 s of maximal rhythmic handgrip contractions with the right hand in two trials 24 to 48 h apart. We used NIRS to measure cerebral oxygenation and blood volume responses from the left prefrontal lobe. Both groups' cerebral oxygenation and blood volume increased during handgrip contractions. The change in cerebral oxygenation was significantly lower in subjects with TBI compared with nondisabled subjects. Intraclass correlations between the two trials for cerebral oxygenation and blood volume were 0.83 and 0.80, respectively, in nondisabled subjects and 0.70 and 0.64, respectively, in subjects with TBI. The findings indicate that NIRS is a reliable noninvasive technique for evaluating cerebral oxygenation and blood volume changes during motor function. NIRS can be useful in monitoring recovery of cerebral oxygenation during rehabilitation of patients with TBI.
authors: Faculty of Rehabilitation Medicine, Corbett Hall, Room 373, University of Alberta, Edmonton, Canada T6G 2G4. yagesh.bhambhani@ualberta.ca
authors: Yagesh
authors: Y
authors: Bhambhani
authors: Ram
authors: R
authors: Maikala
authors: Mamdouh
authors: M
authors: Farag
authors: Gary
authors: G
authors: Rowland
mesh_terms: D000328:Adult; D001810:Blood Volume / Q000502:physiology*; D001921:Brain / Q000098:blood supply*; D001930:Brain Injuries / Q000175:diagnosis / Q000534:rehabilitation*; D016022:Case-Control Studies; D002560:Cerebrovascular Circulation / Q000502:physiology; D005260:Female; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D009788:Occupational Therapy / Q000379:methods; D010101:Oxygen Consumption / Q000502:physiology; D012016:Reference Values; D015203:Reproducibility of Results; D012307:Risk Factors; D012680:Sensitivity and Specificity; D019265:Spectroscopy, Near-Infrared / Q000379:methods*