Background The success of implementing Damage Control Resuscitation principles pre-hospital has been at the expense of several logistic burdens including the requirements for resupply, and the question of donor safety during the development of whole blood programs. Previous studies have reported effects on physical performance after blood donation, however none have investigated the effects of blood donation on cognitive performance. Method We describe a prospective double blinded, randomized controlled study comprised of a battery of tests: three cognitive tests, and VO2max testing on a cycle ergometer. Testing was performed 7 days before blinded donation (Baseline day), immediately after donation (Day 0), and 7 days (Day 7) after donation. The inclusion criteria included being active blood donors at the Haukeland University Hospital blood bank where eligibility requirements were met on the testing days and providing informed consent. Participants were randomized to either the experimental (n=26) or control group (n=31). Control group participants underwent a "mock donation” in which a phlebotomy needle was placed but blood was not withdrawn. Results In the experimental group, mean VO2max declined 6% from 41.35 +/−1.7 mLO2/(min.kg) at baseline to 39.0 +/−1.6 mLO2/(min.kg) on Day 0, and increased to 40.51 +/−1.5 mLO2/(min.kg) on Day 7. Comparable values in the control group were 42.1 +/−1.8 mLO2/(min.kg) at baseline, 41.6 +/−1.8 mLO2/(min.kg) on Day 1 (1% decline from basline), and 41.8 +/−1.8 mLO2/(min.kg) on Day 7. Comparing scores of all three cognitive tests on Day 0 and Day 7 showed no significant differences, p>0.05. Conclusion Our main findings are that executive cognitive and physical performance were well-maintained after whole blood donation in healthy blood donors. The findings inform post-donation guidance on when donors may be required to return to duty. Level of Evidence I Study type Randomized, controlled, double-blinded prospective trial Disclosure; None of the authors have any conflict of interest. Preliminary data has been published at the 7th Annual Meeting of The Trauma Hemostasis and Oxygenation Research Network (THOR) on Remote Damage Control Resuscitation, June 26-28, 2017 in Bergen, Norway. © 2018 Lippincott Williams & Wilkins, Inc.
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