title: Erythropoiesis and performance after two weeks of living high and training low in well trained triathletes.
abstract: The purpose of our study was to evaluate hematologic acclimatization during 2 weeks of intensive normoxic training with regeneration at moderate altitude (living high-training low, LHTL) and its effects on sea-level performance in well trained athletes compared to another group of equally trained athletes under control conditions (living low - training low, CONTROL). Twenty-one triathletes were ascribed either to LHTL (n = 11; age: 23.0 +/- 4.3 yrs; VO 2 max: 62.5 +/- 9.7 [ml x min -1 x kg -1]) living at 1956 m of altitude or to CONTROL (n = 10; age: 18.7 +/- 5.6 yrs; VO 2 max: 60.5 +/- 6.7 ml x min -1 x kg -1) living at 800 m. Both groups performed an equal training schedule at 800 m. VO 2 max, endurance performance, erythropoietin in serum, hemoglobin mass (Hb tot, CO-rebreathing method) and hematological quantities were measured. A tendency to improved performance in LHTL after the camp was not significant (p < 0.07). Erythropoietin concentration increased temporarily in LHTL (Delta 14.3 +/- 8.7 mU x ml -1; p < 0.012). Hb tot remained unchanged in LHTL whereas was slightly decreased from 12.5 +/- 1.3 to 11.9 +/- 1.3g x kg -1 in CONTROL (p < 0.01). As the reticulocyte number tended to higher values in LHTL than in CONTROL, it seems that a moderate stimulation of erythropoiesis during regeneration at altitude served as a compensation for an exercise-induced destruction of red cells.
authors.affiliation: Dept. of Sports and Rehabilitation Medicine, Medical Centre, University of Ulm, Germany. christoph_dehnert@med.uni-heidelberg.de
authors.forename: C
authors.initials: C
authors.lastname: Dehnert
authors.forename: M
authors.initials: M
authors.lastname: Hütler
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: E
authors.initials: E
authors.lastname: Menold
authors.forename: C
authors.initials: C
authors.lastname: Netzer
authors.forename: R
authors.initials: R
authors.lastname: Schick
authors.forename: B
authors.initials: B
authors.lastname: Kubanek
authors.forename: M
authors.initials: M
authors.lastname: Lehmann
authors.forename: D
authors.initials: D
authors.lastname: Böning
authors.forename: J M
authors.initials: JM
authors.lastname: Steinacker
mesh_terms: D000064:Acclimatization / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D000531:Altitude; D004920:Erythropoiesis / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D010806:Physical Education and Training / Q000379:methods*; D013177:Sports / Q000502:physiology*; D013647:Task Performance and Analysis