Symptom-limited, self-paced walking in the assessment of cardiovascular disease in patients with and without heart failure: the predictive value of clinical, anthropometric, echocardiographic and ergonometric parameters.
The assessment of functional capacity in heart disease remains problematic, and it is unclear whether maximal exercise testing is physiologically reflective of the activities of daily living or the quality of life. We therefore employed a symptom-limited, self-paced walking protocol to assess the physical conditions of 41 Nigerian cardiac patients, with and without heart failure. The walking time, walking speed and distance as well as the energy expenditure (Kcal.min-1) were markedly reduced (P less than 0.001) in patients with heart failure (n = 26) compared to the cardiac patients not in failure (n = 15). The double product corrected for exercise time (an index of myocardial oxygen use) was, however, significantly higher (P less than 0.001) in the group with heart failure. Using multiple regression analysis, the parameters of self-paced walking capacity (distance, walking time, and speed) could reliably be predicted (r2 greater than 0.9) from age, body surface area, energy expenditure, and echocardiographic left ventricular dimension in the patients without heart failure. The presence of heart failure appeared to weaken the predictability of the regressions. A significant correlation was obtained between the self paced exercise time and the Bruce protocol treadmill time (r2 = 0.91, P = 0.004) in a subgroup of the patients with heart failure. Thus, the self-paced walking test is sensitive to changes in congestive heart failure and the exercise capacity can be predicted from age and biophysical parameters. The wider clinical usage of this modality, especially in frail patients, is hereby recommended.
Ajayi
A A
AA
Department of Medicine, Faculty of Health Sciences, Obafemi Awolowo University, Ile-Ife, Nigeria.
Balogun
J A
JA
D000328:Adult; D000367:Age Factors; D000368:Aged; D000886:Anthropometry; D001830:Body Surface Area; D002318:Cardiovascular Diseases / Q000175:diagnosis* / Q000453:epidemiology / Q000378:metabolism; D004452:Echocardiography; D004734:Energy Metabolism; D005069:Evaluation Studies as Topic; D005080:Exercise Test / Q000592:standards; D005260:Female; D006333:Heart Failure / Q000175:diagnosis* / Q000453:epidemiology / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D011237:Predictive Value of Tests; D012044:Regression Analysis; D012680:Sensitivity and Specificity; D016138:Walking