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.
Pictorial definitions of seven joint angles used to detect upper-limb motions during tennis backhand strokes. (1) shoulder internal (A)/external (B) rotation, (2) shoulder flexion (A)/extension (B), (3) shoulder abduction (A)/adduction (B), (4) elbow flexion (+)/extension (-), (5) elbow pronation (A)/supination (B), (6) wrist flexion (+)/extension (-), and (7) wrist ulnar (+)/ radial (-) deviation.
