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A treadmill ramp protocol using simultaneous changes in speed and grade.

Janos Porszasz¹, Richard Casaburi, Attila Somfay

¹Rehabilitation Clinical Trials Center, Harbor-UCLA Research and Education Institute, Torrance, CA 90502, USA. jporszasz@rei.edu

Medicine and Science in Sports and Exercise

|September 16, 2003

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A new treadmill protocol offers linear work rate increases, beneficial for exercise testing and rehabilitation in individuals with reduced exercise tolerance. This method provides a low initial metabolic rate, similar to unloaded cycling.

Area of Science:

Cardiopulmonary Exercise Testing
Exercise Physiology

Background:

Standard exercise tests may not be suitable for individuals with impaired exercise tolerance.
A need exists for protocols that provide controlled, incremental workloads for accurate assessment and rehabilitation.

Purpose of the Study:

To develop and evaluate a novel treadmill protocol that achieves a linear increase in work rate.
To compare this protocol with a standard cycle ergometry ramp protocol.

Main Methods:

A new treadmill protocol was designed with a linear increase in walking speed and a curvilinear increase in grade.
Twenty-two healthy, sedentary subjects performed the new treadmill protocol and a standard cycle ergometry ramp protocol.
Oxygen uptake (VO2) and work rate were measured during both protocols.

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Main Results:

The treadmill protocol produced a linear increase in work rate and oxygen uptake (R2 = 0.96).
Initial metabolic rate was low, comparable to unloaded cycling.
Peak oxygen uptake and lactate threshold were significantly higher on the treadmill compared to the cycle ergometer.

Conclusions:

The developed treadmill protocol provides a linear work rate profile, suitable for exercise testing and rehabilitation.
This protocol is appropriate for assessing individuals with low exercise tolerance, offering advantages over existing methods.