Heart rate deflection related to lactate performance curve and plasma catecholamine response during incremental cycle ergometer exercise |
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Authors: | R. Pokan P. Hofmann M. Lehmann H. Leitner B. Eber R. Gasser G. Schwaberger P. Schmid J. Keul W. Klein |
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Affiliation: | (1) Department of Internal Medicine, Karl-Franzens-Univeristy, Auenbruggerplatz 15, A-8036 Graz, Austria;(2) Department of Sports Sciences, Karl-Franzens-Univeristy, Graz, Austria;(3) Department of Radiology, Karl-Franzens-University, Graz, Austria;(4) Department of Physiology, Karl-Franzens-University, Graz, Austria;(5) Department of Internal Medicine, Division of Performance Medicine, Albert-Ludwigs University, Freiburg, Germany;(6) Center of Cardiac Rehabilitation, Bad Schallerbach, Austria |
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Abstract: | The correlation between the behaviour of the heart rate/work performance (fcW) curve and blood lactate ([la]b) and plasma adrenaline/noradrenaline concentrations ([A]/[NA]) during incremental cycle ergometer exercise was investigated. A group of 21 male sports students was divided into two groups: group I, with a clear deflection of thefcW curve; group II, without or with an inverse deflection of thefcW curve. The aerobic threshold (Thaer) and the lactate turn point (LTP) were defined. Between Thaer and maximal work performance (fcWmax) the behaviour of thefcW curve as well as the behaviour of [la–]b and [A]. [NA] were described mathematically. Thefc, systolic blood pressure (BPS),W, [la–]b, [A] and [NA] at rest, Thaer, LTP,fcWmax, after 3 and 6 min of recovery (Re3/Re6) were calculated. A significant difference between the two groups could only be detected forfc at LTP, Re3 and Re6 (P < 0.05). No significant, correlation could be found between individualfcW-behaviour and individual time course of [la–]b, [A] and [NA]. However, a significant correlation was visible between [la–/W-behaviour and individual catecholamine response. These results and the fact that the different flattening at the top of thefcW curve was related to diminished stress-dependent myocardial function led us to the conclusion that it is possible that sympathetic drive is not directly involved in mechanisms of regulation between load dependentfc and myocardial function. In addition, individualfcW behaviour was independent of BPS andWmax, or individual conditions of energy supply. |
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Keywords: | Heart rate deflection Lactate performance curve Plasma catecholamines Cycle ergometry |
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