True Fitness PS500 - Manual (Page 15)

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.
Changes in Speed
Changes in Speed
Walking and
Running:
Speed
Intervals
Walking and
Running:
Speed Ramp
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