ISSN:
1432-1971
Keywords:
Key words: Lactate threshold — Ventilatory threshold — Treadmill — Congenital heart disease — Exercise tolerance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract. The purpose of the present study was to measure oxygen uptake (VO2) at the ventilatory threshold (VT) in patients with congenital heart disease using a progressive exercise protocol on a treadmill and to evaluate the validity and feasibility of this procedure. Eight control subjects and seventeen patients performed a maximal exercise test with breath-by-breath measurement of ventilation and gas exchange variables. VT(VE) was determined by the change in the ventilatory equivalent for VO2 and carbon dioxide output, VT(V-sl) by the V-slope method, and the lactate threshold (LT) by the change in blood lactate concentration; these parameters were determined in 100%, 88%, and 96% of subjects, respectively. The interobserver error among three evaluators was not significant, and LT was correlated with each VT (r= 0.97, 0.92; p= 0.0001) and with peak VO2 (r= 0.91; p= 0.0001). The VTs were correlated with each other when expressed as milliliter per minute and milliliters per kilogram per minute. It was concluded that a progressive exercise protocol on a treadmill was a feasible procedure for determining the VTs in most individuals and that VTs were valid, useful parameters for evaluating submaximal exercise tolerance in patients with congenital heart disease.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002469900002
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