{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,3]],"date-time":"2026-08-03T18:03:48Z","timestamp":1785780228447,"version":"3.56.0"},"reference-count":29,"publisher":"BMJ","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Sports Med"],"published-print":{"date-parts":[[2002,4]]},"abstract":"<jats:p>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.<\/jats:p><jats:p>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<jats:sub>50<\/jats:sub>of the oxyhaemoglobin dissociation curve, and K<jats:sup>+<\/jats:sup>) were measured during the tests.<\/jats:p><jats:p>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<jats:sup>+<\/jats:sup>at the maximal power output (<jats:italic>r<\/jats:italic>= \u22120.67; p&lt;0.05).<\/jats:p><jats:p>Conclusions: The HRDP phenomenon is associated, at least partly, with exercise induced hyperkalaemia.<\/jats:p>","DOI":"10.1136\/bjsm.36.2.113","type":"journal-article","created":{"date-parts":[[2002,7,27]],"date-time":"2002-07-27T10:30:44Z","timestamp":1027765844000},"page":"113-117","source":"Crossref","is-referenced-by-count":9,"title":["Lactic acidosis, potassium, and the heart rate deflection point in professional road 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