Article

European Journal of Applied Physiology and Occupational Physiology

, Volume 42, Issue 2, pp 117-123

First online:

Effects and post-effects of two-hour exhausting exercise on composition and gas transport functions of blood

  • D. BöningAffiliated withPhysiologisches Institut, Deutsche Sporthochschule Köln Carl-Diem-Weg
  • , W. SkipkaAffiliated withPhysiologisches Institut, Deutsche Sporthochschule Köln Carl-Diem-Weg
  • , P. HeedtAffiliated withPhysiologisches Institut, Deutsche Sporthochschule Köln Carl-Diem-Weg
  • , W. JenkerAffiliated withPhysiologisches Institut, Deutsche Sporthochschule Köln Carl-Diem-Weg
  • , U. TibesAffiliated withPhysiologisches Institut, Deutsche Sporthochschule Köln Carl-Diem-Weg

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Summary

Eleven male sport students (age 23.3±1.7 years) exercised for 2 h on a bicycle ergometer (60 rpm), the braking force of which was regulated to yield a constant pulse rate (156±3 min−1). Before, at end of, and 3 and 6 h after exercise blood was sampled from a cubital vein and an earlobe for measurement of hemoglobin (Hb) concentration, hematocrit (Hct) value, osmolality (Osm), plasma protein (Prot), sodium (Na+), potassium (K+), inorganic phosphate (Pi), and lactate (Lac) concentrations, red cell 2,3-diphosphoglycerate (DPG) and adenosin triphosphate (ATP) concentrations, acid base status and half saturation pressure (P50) of the oxygen dissociation curve. At end of exercise [Hb], Hct, [Prot], Osm, [K+], [Pi] and [Lac] were significantly elevated, pH in ear lobe (+0.04) and venous blood (+0.08) was also increased by both respiratory and nonrespiratory effects (BE + 1.4 mmol/l). The oxygen dissociation curve showed an unexplained slight right shift (standard P50+0.19 kPa). During the post-exercise period most parameters approximated to control values after only 3 h. [Prot] and especially [Pi], however, remained elevated while [DPG] slightly rose during the post-exercise period. It is suggested that these changes are first signs of adaptation to exercise, perhaps caused by endocrine stimulation.

Key words

Exertion Physical training Blood Acid base status Oxygen dissociation curve