Table 1. Physical Characteristics and Mechanical Parameters of Contraction, Relaxation, and Contraction–Relaxation Coupling in Adult and Postnatal Rats
Data are mean ± SD.
*P < 0.05 versus adult rats.
Lmax= initial muscle length at the apex of the length-active isometric tension curve; ΔL = maximum extent of shortening; Vmax= maximum unloaded shortening velocity; Vc = maximum shortening velocity; AF = maximum isometric active force normalized per cross-sectional area;
+dF/dt = maximum positive peak force derivative; Vr = maximum lengthening velocity; −dF/dt = maximum negative peak force derivative.