NDLI: Heart rate variability measures and the sympathovagal balance: differences between low and high fit subjects

Content Provider	IEEE Xplore Digital Library
Author	Bootsma, M. Swenne, C.A. Bruschke, A.V.G.
Copyright Year	1995
Description	Author affiliation: Cardiology Dept., Leiden Univ. Hospital, Netherlands (Bootsma, M.; Swenne, C.A.; Bruschke, A.V.G.)
Abstract	The authors addressed the question wether differences in fitness are associated with differences in sympathetic tone, vagal tone, or sympathovagal balance, expressed in the Rosenblueth-Simeone factors m, n, and their product m/spl middot/n. They also determined whether fitness related differences in heart race variability (HRV) are associated with differences in autonomic tone or sympathovagal balance. They measured HRV, heart rate (HR), and, with autonomic blockade, the intrinsic HR and the Rosenblueth-Simeone factors in 21 low fit (mean/spl plusmn/SD age 27.5/spl plusmn/3.4 yrs; VO/sub 2/-max<50 ml/spl middot/kg/sup -1//spl middot/min/sup -1/, mean/spl plusmn/SD 39.8/spl plusmn/6.3 ml/spl middot/kg/sup -1//spl middot/min/sup -1/) and 23 high fit (mean/spl plusmn/SD age 24.1/spl plusmn/3.0 yrs; VO/sub 2/-max>50 ml/spl middot/kg/sup -1//spl middot/min/sup -1/, mean/spl plusmn/SD 57.6/spl plusmn/5.5 ml/spl middot/kg/sup -1//spl middot/min/sup -1/) healthy male subjects. HR and the intrinsic HR differed significantly between the low and high fit groups, but the sympathetic and vagal tone, and the sympathovagal balance were not significantly different. All time- and absolute frequency-domain HRV measures differed significantly. Linear regression of HR, intrinsic HR, sympathetic tone, vagal tone, sympathovagal balance, and the time- and frequency-domain HRV measures on VO/sub 2/-max values of all 44 subjects yielded significant correlations for resting HR, intrinsic HR, standard deviation of inter-beat-intervals, coefficient of variation, percentage of successive inter-beat-intervals differing more than 50 ms, respiratory sinus arrhythmia, and the very low frequency spectral HRV power. All correlations were below 0.50 (<0.25 explained variance). The authors' results demonstrate that the fitness level alters neither sympathetic tone nor vagal tone, or the sympathovagal balance. At the same time, increased VO/sub 2/-max is associated with increased HRV.
Starting Page	441
Ending Page	444
File Size	404759
Page Count	4
File Format	PDF
ISBN	0780330536
DOI	10.1109/CIC.1995.482680
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-09-10
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heart rate variability Heart rate Frequency measurement Cardiology Autonomic nervous system Electrocardiography Hospitals Linear regression Power measurement Measurement standards
Content Type	Text
Resource Type	Article

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