A, the maximal twitch response of force (Pt), maximal voluntary contraction (MVC) and maximal electrically evoked tetanic contraction (Po, recorded at 150 impulses s−1) in control (□) and disused muscle (). B, MVC force as % Po after 7-day immersion in control (□) and disused muscle (). ▪ indicates the force deficit, being the difference between Po and the MVC. C, mean value of the force of contraction of the triceps surae with doublet stimulation at different intervals between pulses. * P < 0.05; ** P < 0.01; *** P < 0.001.