Prediction of glucose oxidation rate during exercise
Deutscher übersetzter Titel: | Bestimmung der Glukose-Oxidationsrate bei körperlicher Aktivität |
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Autor: | Francescato, Maria Pia; Zanier, M.; Gaggioli, F. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 29 (2008), 9, S. 706-712, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-989454 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201001000637 |
Quelle: | BISp |
Abstract
Recently, the relationship between percentage maximal heart rate vs. glucose oxidation rate has been proposed as a tool for estimating glucose oxidation rate during exercise in insulin-dependent diabetic patients. The reliability of this relationship and its applicability to long-term exercise is evaluated. Eight healthy volunteers performed a graded cycloergometric exercise (10-min steps at 30, 50, 70, 90 % of ventilatory threshold). Heart rate and glucose oxidation rate (by indirect calorimetry) were measured during the last 5 min of each step. Volunteers underwent then three 1-hour constant intensity rides at 40, 60, 80 % of ventilatory threshold. Heart rate was recorded continuously; glucose oxidation rate was determined over 15-min periods. The percentage maximal heart rate vs. glucose oxidation rate relationship obtained from the graded exercise matched that previously reported. Independently of intensity, glucose oxidation rates observed during the 1-hr rides were linearly related to the estimated ones (R2 > 0.96, p < 0.001), being, however, progressively over-estimated in subsequent exercise periods. The proposed correction yields values close to the identity line (y = 1.001 · x; R2 = 0.974, p < 0.001), the difference between observed and “corrected” values amounting to 0.23 ± 2.17 mg/min/kg. In conclusion, glucose oxidation rate can be estimated from heart rate, once proper correction factors are applied for long duration exercises. Verf.-Referat