Background: Exercise increases natriuretic peptide levels in chronic heart failure (CHF) patients, but the effect is considered minor. We assessed acute and short-term release (<24 h) of NT-proBNP in CHF patients after a maximal cardiopulmonary exercise test (CPET) and 2 different submaximal training sessions.
Methods And Results: 102 CHF patients either performed CPET (Group 1), a 1 h endurance (Group 2) or a combined endurance-resistance training session (Group 3). NT-proBNP concentration was determined before, at exercise cessation and after 18-22 h (Protocol A). In 20 patients, samples were obtained before, at exercise cessation, after 15, 30, 45, 60, 90 min, 2, 3, 4, 5, 6, 12, 22 h (Protocol B). Protocol A: At peak exercise, a 15%, 11% and 17% relative increase (p<0.001 vs baseline, all 3 groups) was seen, with a return to baseline after 18-22 h. The increase correlated with indicators of more advanced heart failure. Protocol B: A biphasic pattern was derived with a first peak within 1 h of exercise termination and a second peak (39%, 31% and 33% higher than baseline; p<0.05, all 3 groups) after 4-12 h.
Conclusions: The observed biphasic release of B-type natriuretic peptides supports standardization of sampling, taking recent exercise into account.
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