And the idea that postural or emotional changes could bring on purring also seems far-fetched.

The newer products use a small tilting mechanism that is incorporated into the seat to allow postural changes.

The iliacus and psoas major perform different actions when postural changes occur.

He said: "We are using high-end physics to precisely measure the postural changes between 50 and 100 times a second.

Also reflux provoked by postural changes such as stopping cannot be measured by this method.

Baroreflex and autonomic pathways normally ensure that blood pressure is maintained despite various stimuli including postural change.

Even postural changes and fidgeting made a difference.

This may be accomplished by postural changes, altered body proportions, or smaller size.

This postural change, sometimes called the "zero-g crouch," is in addition to the one- to two-inch lengthening of the spine during space missions.

As discussed above, postural changes, exercise, and dehydration are some of the likely culprits.