The modified Bruce Protocol 

The modified Bruce Protocol is an alteration in the protocol so that the treadmill is initially horizontal rather than uphill, with the 1st few intervals increasing the treadmill slope only

which starts at a lower

workload than the standard test, and is

typically used for elderly or sedentary

patients.

First two stages of modified Bruce test

are performed at a 1.7mph and 0%

grade and 1.7mph and 5% grade

And the third stage corresponds to the

first stage of the standard Bruce test

protocol as lis

It  is typically used for patients who are deconditioned and/or post MI, whose history suggests symptoms at a low workload, and for elderly or sedentary patients who may not be able to keep pace with the faster Standard Bruce protocol.