Table 1.

Five upper extremity postures

Elbow Angle Maintained	Muscle Length Maintained
Forearm supinated, elbow 90° (36.02 cm)	Forearm supinated, elbow  78° (37.05 cm)
Forearm neutral, elbow 90° (37.05 cm)	Forearm neutral, elbow  90° (37.05 cm)
Forearm pronated, elbow 90° (38.84 cm)	Forearm pronated, elbow  113° (37.05 cm)

Forearm posture, elbow angle, and muscle length (in parentheses) are indicated in conditions where elbow angle was held at 90° of flexion with different forearm rotations or where biceps brachii muscle length was held constant despite forearm rotation.