According to "swinging cross-bridge model", muscle contraction is produced by cyclical attachment and detachment of cross-Bridges towards thin filament. In this paper, we investigate the cooperative behaviors of cross-bridges in muscle isotonic contraction in one dimensional condition. Firstly we suppose a relationship between energy and time for a single cross-bridge during the working cycle. Then we investigate two particular cooperative behaviors of cross-bridges in muscle isotonic contraction（in which the extern load F is constant）: （1）...
