Ciao,

e' vero che "treadmill" significa 'tapis roulant', ma credo che tu intendessi la definizione seguente:

"What is an Exercise Treadmill Test?

An exercise treadmill test is done to measure the heart's ability to respond to exercise. To do the test, a child walks on a treadmill while a technician monitors his or her heart rate and blood pressure. The child may also be asked to breathe through a special tube during the test. The test is painless and complications from the test are very rare."
(http://www.med.umich.edu/1libr/chheart/noninv08.htm)

In italiano puoi trovare un'occorrenza qui:

http://www.pnlg.it/db/ecodoppler/ecodoppler-2.htm

Saluti.

Elisabetta