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The effect of a 120-day 5° head-down tilt on the maximal twitch response of force (P t), maximal voluntary contraction (MVC), and evoked electrical tetanic stimulation at a frequency of 150 impulses s−1 (P o) (top panel) and force deficiency (P d) (bottom panel) of the triceps surae muscle. **p < 0.02; ***p < 0.01; ****p < 0.001
