View Full Version : vertical center line (from side view) of human torso

01-09-2003, 04:28 AM
I am testing the whole body safety harness using human subjects. One of
the test conditions requires that subjects be suspended by a cable from
above that is connected to a D-ring at the back. According to ANSI
(Z359.1-1992), "In suspension, after the fall is arrested, the angle at rest
which the vertical center line of the test torso (from the side view of the
torso, my interpretation) makes with the vertical shall on exceed 30

I am concerned about the definition of the vertical center line of the
test torso. I talked to a person who helped develop the ANSI standard. I was
told that because the definition was based on test dummies instead of human
torsos, it is not clear how the center line of human torso should be
defined. But as long as the center line of the human torso is defined as
parallel to the spinal column, the definition should be acceptable.

So, my question is how I should define the center line. Can I landmark
the center point of the chest cage (right side view) and the right greater
trochanter, connect the two points and take this line as the center line? Or
is there any better way to define the center line?

Jinhua Guan

Associate Service Fellow

National Institute for Occupational Safety and Health

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