Heart Rate 106, Good BP. Intake Of Protein Bars, On Stress Due To Refusal To Take Plasma Donation. Reason?

hy my name is jared an my wife was wanting to donate plasma but couldnt .they told her her heart rate was 106 . she waited awhile an they checked it again. it was 103 .she has good blood pressure . but could not understand what the big deal is.think the blood pressure would be the only concern.she was under stress though because they told her she didnt eat enough to give.when che ate two bagel halves with peanut butter on them an one of those special k protein full bars . think that wd have been enough .but no they told her to eat a burger of all things an come back . so she did .and her heart rate went up. sounds stupid to me .an she weighs 227lbs by the way.