True CS 1.0 Owner's Manual page 16

Pre-Set Workouts
chapter one: basic operations
Zero-grade walking or running intervals are in one-minute
segments. Grade changes are permanent; speed changes affect the
current one-minute segment only.
Zero-grade gradually increases speed then decreases speed,
changing once per minute. Grade changes are permanent; speed
changes affect the current one-minute segment only.
14
CS1.0 Treadmill Owner's Guide
Changes in Speed
Changes in Speed
Walking
and
Running:
Speed
Intervals
Walking
and
Running:
Speed
Ramp-Up