Date Approved


Graduate Degree Type


Degree Name

Physical Therapy (M.S.)

Degree Program

Physical Therapy

First Advisor

Jim Scott

Second Advisor

Arthur Schwarcz

Third Advisor

Neal Rogness


Background and purpose. The Physiological Cost Index (PCI) was developed as a tool using heart rate and walking speed to measure energy expenditure during walking. This tool was developed using long distances, therefore, its validity at short distances is unknown. The purpose of this study was to determine the validity of the PCI at short distances.; Subjects. Forty-six subjects aged 20-30 years old were tested. Methods. Subjects walked 600 meters around a 40 meter oval track. Heart rate and walking speed were monitored at various intervals. Results. No strong correlation between short and long distances was found until 80 meters (r =.84). An r-value above.9 was not obtained until 160 meters. Conclusion and discussion. In order to obtain a valid PCI measurement, subjects must walk a minimum of 80 meters. For a strong correlation subjects must walk a minimum of 160 meters.


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