Key result
Heart rate deflection point in professional cyclists is inversely linked to exercise-induced hyperkalemia.
Why the study?
The influence of lactic acidosis, the Bohr effect, and exercise induced hyperkalaemia on the heart rate deflection point in elite cyclists was not determined.
Does exercise-induced hyperkalaemia influence the occurrence of the heart rate deflection point in professional road cyclists?
Cross-Sectional (n=16)
Does exercise-induced hyperkalaemia influence the occurrence of the heart rate deflection point in professional road cyclists?
The heart rate deflection point phenomenon during maximal exercise in elite cyclists is associated with exercise-induced hyperkalaemia.
Answers are grounded in this paper and cite their sources.
Hyperkalaemia may underlie heart rate deflection in cyclists; hypothesis-generating and should not yet change monitoring or training practices.
OBJECTIVE: To determine the influence of lactic acidosis, the Bohr effect, and exercise induced hyperkalaemia on the occurrence of the heart rate deflection point (HRDP) in elite (professional) cyclists. METHODS: Sixteen professional male road cyclists (mean (SD) age 26 (1) years) performed a ramp test on a cycle ergometer (workload increases of 5 W/12 s, averaging 25 W/min). Heart rate (HR), gas exchange parameters, and blood variables (lactate, pH, P(50) of the oxyhaemoglobin dissociation curve, and K(+)) were measured during the tests. RESULTS: A HRDP was shown in 56% of subjects at about 88% of their maximal HR (HRDP group; n = 9) but was linear in the rest (No-HRDP group; n = 7). In the HRDP group, the slope of the HR-workload regression line above the HRDP correlated inversely with levels of K(+) at the maximal power output (r = -0.67; p<0.05). CONCLUSIONS: The HRDP phenomenon is associated, at least partly, with exercise induced hyperkalaemia.
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Lucı́a et al. (2002) conducted a cross-sectional in Elite (professional) cyclists (n=16). Exercise-induced hyperkalaemia during a ramp test was evaluated on Correlation between the slope of the HR-workload regression line above the HRDP and levels of K(+) at maximal power output (r = -0.67, p=<0.05). The heart rate deflection point phenomenon in professional cyclists was associated with exercise-induced hyperkalaemia, showing an inverse correlation with K+ levels (r = -0.67; p<0.05).
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