The Bruce treadmill test is a maximal running test performed on a treadmill. It is one of the most commonly used tests in USA.

Instructions:
1. You need a treadmill that has reliable incline and speed possibilities.
3. Note the time at the point of exhaustion.

Every three minutes speed and grade is changed as follows:

 Time (min) 3 6 9 12 15 18 21 Speed (mph) 1.7 2.5 3.4 4.2 5 5.5 6 Grade (%) 10 12 14 16 18 20 22

Should be read like this: the test begins with speed 1.7 mph and incline at 10%. After 3 minutes speed is increased to 2.5 mph and incline to 12%.
This calculator is also included in Fitness Test pro

Reference:
ACSM's Guidelines for exercise testing and prescription. Seventh edition. pp 99-100

#13 ray ro 2016-08-30 17:14
Your Bruce treadmill calculator maxes out at age 60 which does not seem correct
#12 Kelly Anderson 2013-07-17 10:37
I do love the post that you have made in here. Thanks for sharing it to us.
#11 Arvind 2013-07-11 17:14
Most machines do not allow increase in the slope by 2%, it is only by 5%.
#10 ANTHONY 2013-06-16 08:40
MORE EFFORT REQUIRED FROM PERSON OF 68 INCH HEIGHT THAN PERSON OF 74 INCH HEIGHT. HOW DO MEDICS ACCOUNT FOR THIS?
#9 John 2012-11-18 11:28
It is a walking exercise, not a running exercise. Maybe requires adjusting of the speed
#8 brian heise 2011-08-31 19:46
see wikepedia, slope is rise over run or grade.

for example a 45 degree ange with the horizon describes a right angle. also a 45 degree angle with horizon.

rise over run is 1/1 equals a 100 persent grade at a angle of 45 degrees.

as is all falls out, the grade in % is about twice the angle in degrees with the horizon.

so if you complete stage 7 bruce protocol at 6 mph and 22% grade, you are exercising at about 11 degrees with the horizon.

I believe this correlates with incline 11/15 with most treadmills.

see grade and degrees on wikepedia.
#7 Aidan Emmerson 2011-02-17 11:34
i did this 3 times non stop
#6 Weslo 2010-08-27 02:04
Thanks for the post! Treadmills are such useful pieces of equipment. They are so convenient, easy on your joints, and having one in your home helps you remember every day to exercise.