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Na+-stimulated Na+–K+-ATPase activity was determined by measuring ATP hydrolysis in muscle homogenate from m. vastus lateralis at non-fatigue and at time of fatigue after three bouts of 4 min exercise at 75% of 
and a bout to fatigue at 120% of 
with terbutaline and placebo in EXP1 (n = 10). Data are presented as means = ± SEM. #Different (P < 0.05) from time of fatigue.
