Giving blood

Gave blood last night about 8.00pm for the 1st time in years (decided it was about time I did something for someone else for a change)

without thinging of the concequences I did a 7.8m run @ 10.00am this morn and rerally struggled over the last 3m was running @ 8.30pace over a hilly course but blew up and ended doing 9.20/mile

I am assumimg this was due to having a whole armful less of blood to pump round.

does anyone know if the theory holds up
???

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