J. Bryan Mann (IMAGE) University of Missouri-Columbia Caption Mann found that an increase of three repetitions on the NFL-225 test indicated the smallest worthwhile difference in performance, suggesting a physiological improvement rather than luck. Credit University of Missouri Usage Restrictions credit University of Missouri License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.