TY - JOUR 
A1 - Lucía Mulas, Alejandro
AU - Hoyos, J.
AU - Santalla Hernández, Alfredo
AU - Pérez Ruiz, Margarita
AU - Carvajal, Alfredo
AU - López Chicharro, José
T1 - Lactic acidosis, potassium, and the heart rate deflection point in professional road cyclists
Y1 - 2002
SN - 03063674

UR - http://hdl.handle.net/11268/5702
AB - The aim of this study is 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. 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. 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). The HRDP phenomenon is associated, at least partly, with exercise induced hyperkalaemia.
KW - Condición física
KW - Ciclismo
KW - Medicina deportiva
KW - Medicina deportiva
LA - eng
ER -