In the same 1981 study, the mean carpal canal pressure in patients rose to 110 millimeters of mercury with the wrist extended 90 degrees back toward the forearm, the highest reading the study reported for patients.

Checked against its source on October 16, 2026

In the source's own words

“while with 90 degrees of wrist extension the mean pressure was 110 millimeters of mercury”

The carpal tunnel syndrome. A study of carpal canal pressures, Richard H. Gelberman et al., Journal of Bone and Joint Surgery (American volume), 1981, Abstract.

What it measures: The study measured the same patients with the wrist neutral, flexed and extended, and compared them with control subjects.
What it does not show: A small 1981 study. The highest reading is the extended wrist. The abstract does not say how the positions compare during sleep.