Wednesday, November 9, 2011

Blood Donation, Recovery and Peak Aerobic Power.

Interesting little study!

Time Course for Recovery of Peak Aerobic Power After Blood Donation

Judd, TB, Cornish, SM, Barss, TS, Oroz, I, and Chilibeck, PD. Time course for recovery of peak aerobic power after blood donation. J Strength Cond Res 25(11): 3035–3038, 2011—

Peak aerobic power (V̇O2peak) is decreased after blood donation, but the time course for full recovery is unknown. We measured V̇O2peak and exercise time to fatigue before and weekly for 4 weeks after 450-ml blood donation at a blood donor clinic, to determine the time course of recovery. Twelve moderately active individuals (2 women, 10 men; 24.3 ± 5.2 years) of average aerobic fitness (based on their V̇O2peak relative to normative values) completed V̇O2peak exercise tests before donation, the day after donation, and at weekly intervals for 4 weeks after donation. V̇O2peak was determined by an incremental exercise test on a cycle ergometer. At baseline, mean absolute and relative V̇O2peak values were 4.06 ± 0.92 L·min−1 and 46.6 ± 7.0 ml·kg−1·min−1, respectively. V̇O2peak was significantly decreased on day 1 (3.85 ± 0.89 L·min−1; 44.0 ± 6.5 ml·kg−1·min−1) and during week 2 (3.91 ± 0.97 L·min−1; 44.5 ± 7.2 ml·kg−1·min−1) after blood donation (p < 0.05), and recovered at week 3 after donation. Time to fatigue and peak heart rate were not significantly affected by blood donation. 

We conclude that blood donation causes a significant decrease in V̇O2peak for between 2 and 3 weeks. The practical application of this study is that aerobic power in people of average fitness will be decreased, up to 3 weeks after donating blood. Despite this, there is no effect of blood donation on performance as measured by time to fatigue during an incremental test on a cycle ergometer.



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