Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Damping (A) and stiffness (B) coefficients estimated for adolescents (grey line) and adults (black line) with Down syndrome over the three cycles following the first flexion. F1–F4, peak angles of flexion; E1–E4, peak angles of extension. Data were normalized to the gravitational torque and expressed as means and standard deviations.* P<0.05. ** P<0.01.
