The effect of short and long duration exercise on serum erythropoietin concentrations
European journal of applied physiology and occupational physiology(1993)
摘要
The effects of short and long duration exercise on serum erythropoietin concentrations [EPO]s were studied in seven male cross-country skiers of national team standard and eight male marathon runners, respectively. The short duration exercise was performed as 60 min of cycling at an intensity of 80%–95% of maximal heart rate. Arterial blood oxygen saturations monitored by pulse-oximetry remained unchanged throughout exercise. The partial pressure of O2 at which haemoglobin was half-saturated with O2 calculated from forearm venous blood gas tension and blood O2 saturation, and the erythrocyte 2,3-diphosphoglycerate did not change significantly during the exercise. Blood lactate concentrations were increased at the end of exercise [from 1.3 (SEM 0.1) to 3.6 (SEM 0.3) mmol · 1−1]. The [EPO]s determined (by enzyme-linked immunosorbent assay) pre-exercise, 5 min, 6 h, 19 h, and 30 h after the exercise were unchanged [from 16.1 (SEM 2.6) to 19.1 (SEM 3.2), 17.9 (SEM 3.0), 17.0 (SEM 2.5), and 18.6 (SEM 2.9) U·l−1, respectively]. The [EPO]s were not correlated to the earlier parameters. The long duration exercise consisted of habitual training, a 3 week break from training followed by 2 and 4 weeks of re-training. The [EPO]s, body fat (BF), and serum free-testosterone concentrations determined at the end of each period remained unchanged. The maximal oxygen uptakes were decreased after the break from training and increased during retraining (P=0.04). Body mass (mb) increased after the break in training (P=0.02). The [EPO]s were correlated to BF,r=0.42,P=0.02;mb,r=0.45,P=0.01; and free-testosterone concentrations,r=0.44,P=0.01. Thus, short and long-duration exercise had no direct influence on [EPO]s; but relationships among [EPO]s, free-testosterone concentrations and body composition were noted.
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关键词
Erythropoietin,Exercise,Blood oxygen affinity,Body mass,Body composition,Testosterone,Maximal oxygen uptake
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