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J Am Coll Cardiol, 2004; 43:2278-2280, doi:10.1016/j.jacc.2004.03.034
© 2004 by the American College of Cardiology Foundation
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Origin and significance of heart rate variability*

Mikko Tulppo, PhD{dagger} and Heikki V. Huikuri, MD, FACC{ddagger},*

{dagger} Merikoski Rehabilitation and Research Center, Oulu, Finland
{ddagger} Division of Cardiology, Department of Medicine, University of Oulu, Oulu, Finland



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  		Figure 1 Standard deviation of the 5-min mean R-R interval (SDANN) and corresponding heart rate (HR) analyzed from 15 min of supine rest, from 15 min free standing in laboratory, from 15 min steady-state treadmill walking at 4.5 km/h, and finally from incremental treadmill walking (from 4.5 km/h to 6.5 km/h) in four healthy subjects. Data is re-analyzed from the study of Tulppo et al. (7).

 




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