Graduation Date

Spring 5-7-2016

Document Type


Degree Name

Master of Science (MS)


Medical Sciences Interdepartmental Area

First Advisor

Dr. Joseph F. Norman

Second Advisor

Dr. Ka-Chun Siu

Third Advisor

Dr. Bunny Pozehl


Being able to accurately monitor and quantify the amount of physical activity an individual with chronic heart failure (CHF) performs can be of assistance in developing appropriate interventions. This thesis attempted to evaluate the validity of the RT3 accelerometer (RT3) and 7-day Physical Activity Recall Questionnaire (7 day PAR) in measuring the daily activity levels of community dwelling individuals with CHF. Fifty-four individuals with CHF participated in a 7 day session to estimate their daily physical activity by using the RT3 accelerometer and 7-day PAR questionnaire. In addition, 15 of the 54 individuals participated in a second study in with the validity of RT3was compared to oxygen consumption (VO2) measured by a MedGraphics VO2000 gas analyzer during typical daily activities. Although there was no significant difference between the RT3 and VO2 on mean caloric (Kcal) expenditure (p=0.67), the accelerometer tended to underestimate the energy expenditure (EE) and its validity was affected by activity intensity, movement patterns, placement location and soft tissue adhesion. The 7-day PAR overestimated EE by 22%, when compared to the RT3. There was no significant difference in the outcomes if the 7-day PAR only focused on day time activity versus 24-hour activity which included sleep. The second study revealed that the resting metabolic rate in individuals with CHF is significantly lower than 3.5 ml/kg/min, which indicates this metabolic constant for the general population is probably not appropriate for estimating daily energy expenditure in individuals with CHF.