Carotid-cardiac baroreflex and training status: significance of initial responsiveness.

Abstract:

:The aim of this study was to demonstrate that within a population of healthy men (n = 15) of varying levels of aerobic fitness (VO2max = 36-74 mL.kg-1.min-1), (i) there are high and low responders with respect to carotid-cardiac baroreflex responsiveness, despite similar baseline heart rates (HRs) both at rest and during dynamic exercise, and (ii) there is a weak association between this responsiveness and training status (VO2max) because of a large overlap in the responses between trained (endurance, ET) and untrained (UT) individuals. Baroreflex function curves were derived during supine rest for each subject by applying varying pressures around the neck in a beat-to-beat ramp (for 12 beats) of +40 to -60 mmHg (1 mmHg = 133.3 Pa). Subjects were divided into low (n = 8) and high (n = 7) responders on the basis of the magnitude of the maximal dynamic R-R interval (RRI) range of the baroreflex curve. Both bradycardic (percent slowing) and tachycardic (percent acceleration) components of the baroreflex curve, and peak sinus node responses (HR, RRI) to continuous neck suction (-60 mmHg) at rest and during exercise (cycling, 45% VO2max) were greater in high compared with low responders (p < 0.05), as assessed using both HR and RRI scales.(ABSTRACT TRUNCATED AT 250 WORDS)

authors

Savard GK,Lundie MJ

doi

10.1139/y95-014

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

98-106

issue

1

eissn

0008-4212

issn

1205-7541

journal_volume

73

pub_type

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