@article{ref1,
title="Heart rate and heart rate variability at rest and during exercise in boys who suffered a severe traumatic brain injury and typically-developed controls",
journal="Brain injury",
year="2010",
author="Katz-Leurer, Michal and Rotem, Hemda and Keren, O. and Meyer, Shirley",
volume="24",
number="2",
pages="110-114",
abstract="Objectives: To measure heart rate (HR) and heart rate variability (HRV) at rest and during exercise in children with post-severe traumatic brain injury as compared to age-matched typically-developed controls. Design: Comparative study. Setting: Out-patient rehabilitation department. Participants: Twelve boys post-severe traumatic brain injury (TBI) (aged 7-13 years) and 18 typically-developed (TD) boys matched for age. Interventions: HR and HRV were determined at rest and at a steady functional walking rate on the treadmill. Main outcome measures: HR and HRV parameters include: time domain parameters: standard deviation of the R-R interval, square root of the mean squared differences of successive R-R differences at rest and during steady-state exercise. Results: Children post-TBI demonstrated higher mean HR values at rest (TBI 91.8 +/- 7.0 beats per minute vs 72.0 +/- 7.1 beats per minute in controls, p < 0.05) and during exercise (TBI 123.4 +/- 15.5 beats per minute vs 113.0 +/- 9.1 beats per minute in controls, p < 0.05). At rest, the time domain measures of HRV were significantly lower in the TBI group (p < 0.05). Time domain mean values decreased significantly during exercise only among the TD children. Conclusions: The findings of this study suggest that among children post-severe TBI, the cardiac autonomic mechanism is less efficient at rest and less adaptive to exercise and activity as compared to TD children.<p /> <p>Language: en</p>",
language="en",
issn="0269-9052",
doi="10.3109/02699050903508234",
url="http://dx.doi.org/10.3109/02699050903508234"
}