Efeitos da doação de sangue sobre a resposta hipóxica e o desempenho físico

Abstract

Some people are afraid that blood donation can cause discomfort, dizziness or weakness. This study aimed to verify the effects of donating 450 ml of blood over the physical performance after 24 hours. The study group was composed of 9 male student volunteers (22 +/- 3 years old, 74 +/- 18 kg). The procedures for collecting data included: signing the informed consent and approval in the risk questionnaire; first hypoxic test at rest, and after 15 minutes the first maximal exercise test (MET) on a treadmill; three days later, the participants donated blood; hypoxic test and MET were repeated 24 hours after donation. The results indicated that there was no change in SpO2, CF, SBPH, and DBPH within the 15 minutes of hypoxia, comparing the moments before and after the donation. During exercise, after donation, CF and SSE were significantly higher only in the first speed stage, 9 km/h. The running performance was significantly lower after the donation. We conclude that the removal of 450 ml of blood does not change the variables BP and CF at rest, in normoxia and in hypoxia, and in exercise, except for the speed of 9 km/h, and we did not observe any malaise or discomfort to the study group.