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Blood volume does increase due to training. It would make sense that this would see a small amount of weight increase as you've got a bit more fluid in your system. How much though, I don't know.
"Blood is a significant mass within the body, with an average volume for an adult of 51. liters (1); blood typically represents approximately 8% of body mass. For an elite-level endurance athlete, the blood volume may be 30% greater than that of the average adult."
http://www.faqs.org/sports-science/Ba-Ca/Blood-Volume.html -
A big training Block will increase blood volume.
Its part of why we dont stop training too soon before an event. Definitely a weight penalty Worth having though.
...unless you have the kit to carry the extra weight in chilled bags for later...........
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hippy
Smallfurry
@Kompute
A friend keeps mentioning that blood volume increases, generally at the end of a bklock of training, can effect your weight? Any truth in that? I'd of thought maybe grams, rather than 100s of, or even KGs?