ISSN:
1439-6327
Keywords:
Heart rate deflection
;
Lactate performance curve
;
Plasma catecholamines
;
Cycle ergometry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The correlation between the behaviour of the heart rate/work performance (f c W) 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 thef c W curve; group II, without or with an inverse deflection of thef c W curve. The aerobic threshold (Thaer) and the lactate turn point (LTP) were defined. Between Thaer and maximal work performance (f c W max) the behaviour of thef c W curve as well as the behaviour of [la−]b and [A]. [NA] were described mathematically. Thef c, systolic blood pressure (BPS),W, [la−]b, [A] and [NA] at rest, Thaer, LTP,f c W max, after 3 and 6 min of recovery (Re3/Re6) were calculated. A significant difference between the two groups could only be detected forf c at LTP, Re3 and Re6 (P 〈 0.05). No significant, correlation could be found between individualf c W-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 thef c W 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 dependentf c and myocardial function. In addition, individualf c W behaviour was independent of BPS andW max, or individual conditions of energy supply.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00361546
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