RT Journal Article
SR Electronic
T1 Lactic acidosis, potassium, and the heart rate deflection point in professional road cyclists
JF British Journal of Sports Medicine
JO Br J Sports Med
FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine
SP 113
OP 117
DO 10.1136/bjsm.36.2.113
VO 36
IS 2
A1 A Lucía
A1 J Hoyos
A1 A Santalla
A1 M Pérez
A1 A Carvajal
A1 J L Chicharro
YR 2002
UL http://bjsm.bmj.com/content/36/2/113.abstract
AB 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, P50 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.