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"Time course of changes in endurance capacity: a 1-yr training study." Med Sci Sports Exerc. 2009;41(5):1130-7.
"Exercise and the heart: can you have too much of a good thing?" Med Sci Sports Exerc. 2008;40(8):1390-2.
"Exercise-associated increases in cardiac biomarkers." Med Sci Sports Exerc. 2008;40(8):1408-15.
""Exercise-induced increases in cardiac troponins in endurance athletes: a matter of exercise duration and intensity?"." Clin Res Cardiol. 2008;97(1):62-3; author reply 61.
"Exercise-induced increases in NT-proBNP are not related to the exercise-induced immune response." Br J Sports Med. 2008;42(5):383-5.
"Is it helpful to study a commercial multi-nutrient supplement on exercise performance?" Eur. J. Appl. Physiol.. 2008;103(4):487.
"Volume vs. intensity in the training of competitive swimmers." Int J Sports Med. 2008;29(11):906-12.
"Do inhaled beta(2)-agonists have an ergogenic potential in non-asthmatic competitive athletes?" Sports Med. 2007;37(2):95-102.
"Physiological characteristics of badminton match play." Eur. J. Appl. Physiol.. 2007;100(4):479-85.
"Bicuspid aortic valve: evaluation of the ability to participate in competitive sports: case reports of two soccer players." Clin Res Cardiol. 2006;95(4):228-34.
"Cardiocirculatory and metabolic responses at different walking intensities." Br J Sports Med. 2006;40(1):64-7.
"Characteristics of inline speedskating--incremental tests and effect of drafting." Int J Sports Med. 2006;27(10):818-23.
"Does cumulating endurance training at the weekends impair training effectiveness?" Eur J Cardiovasc Prev Rehabil. 2006;13(4):578-84.
"Effects of graded carbohydrate supplementation on the immune response in cycling." Med Sci Sports Exerc. 2006;38(2):286-92.
"Inhaled beta2 agonists and performance in competitive athletes." Br J Sports Med. 2006;40 Suppl 1:i43-7.
"Reproducibility and clinical significance of exercise-induced increases in cardiac troponins and N-terminal pro brain natriuretic peptide in endurance athletes." Eur J Cardiovasc Prev Rehabil. 2006;13(3):388-97.
"Risk factors for injuries in elite female soccer players." Br J Sports Med. 2006;40(9):785-90.
"The work rate corresponding to ventilatory threshold during steady-state and ramp exercise." Int J Sports Physiol Perform. 2006;1(3):222-32.
"Altered vitamin B12 status in recreational endurance athletes." Int J Sport Nutr Exerc Metab. 2005;15(4):433-41.
"An alternative approach for exercise prescription and efficacy testing in patients with chronic heart failure: a randomized controlled training study." Am. Heart J.. 2005;149(5):e1-7.
"Ambulatory gas exchange measurements--current status and future options." Int J Sports Med. 2005;26 Suppl 1:S19-27.
"A conceptual framework for performance diagnosis and training prescription from submaximal gas exchange parameters--theory and application." Int J Sports Med. 2005;26 Suppl 1:S38-48.
"Does prolonged cycling of moderate intensity affect immune cell function?" Br J Sports Med. 2005;39(3):171-7; discussion 171-7.
"Independent elevations of N-terminal pro-brain natriuretic peptide and cardiac troponins in endurance athletes after prolonged strenuous exercise." Am. Heart J.. 2005;150(6):1128-34.
"Injuries in female soccer players: a prospective study in the German national league." Am J Sports Med. 2005;33(11):1694-700.
"Peak oxygen uptake. Myth and truth about an internationally accepted reference value." Z Kardiol. 2005;94(4):255-64.
"Running 8000 m fast or slow: Are there differences in energy cost and fat metabolism?" Med Sci Sports Exerc. 2005;37(10):1789-93.
"Running exercise of different duration and intensity: effect on endothelial progenitor cells in healthy subjects." Eur J Cardiovasc Prev Rehabil. 2005;12(4):407-14.
"Are the cardiac effects of anabolic steroid abuse in strength athletes reversible?" Heart. 2004;90(5):496-501.
"Can serum NT-proBNP detect changes of functional capacity in patients with chronic heart failure?" Z Kardiol. 2004;93(7):540-5.
"Clinical significance of increased cardiac troponins T and I in participants of ultra-endurance events." Am. J. Cardiol.. 2004;94(5):696-8.
"Different effects of two regeneration regimens on immunological parameters in cyclists." Med Sci Sports Exerc. 2004;36(10):1743-9.
"Exercise programmes for patients with chronic heart failure." Sports Med. 2004;34(14):939-54.
"Is lactic acidosis a cause of exercise induced hyperventilation at the respiratory compensation point?" Br J Sports Med. 2004;38(5):622-5.
"Left ventricular dimensions and function in strength athletes. Re: Hartgens F, Cheriex EC, Kuipers H. Prospective echocardiographic assessment of androgenic-anabolic steroids effects on cardiac structure and function in strength athletes. Int J Sports Med." Int J Sports Med. 2004;25(3):241-2; author reply 243-4.
"Long-distance mountain biking does not disturb the measurement of total, free or complexed prostate-specific antigen in healthy men." Clin. Chem. Lab. Med.. 2004;42(3):347-9.
"No difference in N-terminal pro-brain natriuretic peptide (NT-proBNP) concentrations between endurance athletes with athlete's heart and healthy untrained controls." Heart. 2004;90(9):1055-6.
"Suggested new upper limit of physiologic cardiac hypertrophy determined in Japanese ultramarathon runners must be interpreted cautiously." J. Am. Coll. Cardiol.. 2004;44(2):470-1; author reply 471.
"5-HT1A responsivity in patients with panic disorder before and after treatment with aerobic exercise, clomipramine or placebo." Eur Neuropsychopharmacol. 2003;13(3):153-64.
"Doubtful validity of the yo-yo intermittent recovery test. ." Med Sci Sports Exerc. 2003;35(12):2119; author reply 2120.
"Maximal oxygen uptake during field running does not exceed that measured during treadmill exercise." Eur. J. Appl. Physiol.. 2003;88(4-5):387-9.
"Metabolic profile of 4 h cycling in the field with varying amounts of carbohydrate supply." Eur. J. Appl. Physiol.. 2003;88(4-5):431-7.
"Mobilization and oxidative burst of neutrophils are influenced by carbohydrate supplementation during prolonged cycling in humans." Eur. J. Appl. Physiol.. 2002;87(6):584-7.
"Anaerobic exercise induces moderate acute phase response." Med Sci Sports Exerc. 2001;33(4):549-55.
"Effect of aerobic exercise on behavioral and neuroendocrine responses to meta-chlorophenylpiperazine and to ipsapirone in untrained healthy subjects." Psychopharmacology (Berl.). 2001;155(3):234-41.
"Reliability of gas exchange measurements from two different spiroergometry systems." Int J Sports Med. 2001;22(8):593-7.
"Therapeutic impact of exercise on psychiatric diseases: guidelines for exercise testing and prescription." Sports Med. 2000;30(4):269-79.
"Transferability of workload measurements between three different types of ergometer." Eur. J. Appl. Physiol.. 2000;82(3):245-9.
"The use of the Panic and Agoraphobia Scale (P & A) in a controlled clinical trial." Pharmacopsychiatry. 2000;33(5):174-81.
"Decreased neuroendocrine responses to meta-chlorophenylpiperazine (m-CPP) but normal responses to ipsapirone in marathon runners." Neuropsychopharmacology. 1999;20(2):150-61.