Torso Rotation

Summary

Torso Rotation measures the average angular rotational range of the chest.

Details

Torso Rotation is the average angular rotational range of the chest, measured at the sternum once per second. This measurement is dependent on the torso’s rotational axis, which closely parallels the spine: when sitting up, the spine/rotational axis will be vertical (perpendicular to the ground), and when in riding position, the spine/rotational axis will tilt toward the handlebars.

A larger Torso Rotation value indicates greater average rotation of the torso, and a lower value indicates more limited average rotation. Although this motion might be thought of as being similar to twisting of the torso, it is important to note that the amount of “twisting” is dependent on actual torso rotation and pelvic rotation at the time of measurement.

Score

Each clockwise and counterclockwise rotation occurring within a second is recorded and averaged, resulting in an angular score.

Value Range	Level	Visual Reference
12°+	Bad	Upper body is rotating in a big way
8 - 12°	Low	Upper body is rotating
4 - 8°	Moderate	Normal movement
0 - 4°	Good	Steady upper body