Physical fitness as a determinant of vagal modulation
Deutscher übersetzter Titel: | Koerperliche Fitness als Determinante der Variabilitaet des Vagotonus |
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Autor: | Goldsmith, R.L.; Bigger, J.T.; Bloomfield, D.M.; Steinman, R.C. |
Erschienen in: | Medicine and science in sports and exercise |
Veröffentlicht: | 29 (1997), 6, S. 812-817, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0195-9131, 1530-0315 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199801209131 |
Quelle: | BISp |
Abstract des Autors
The association between increasing age and decreasing vagal modulation is well known. However, the importance of fitness as a determinant of the decline in vagal modulation with age is not established. To test the hypothesis that decreasing vagal modulation is largely a function of declining fitness, rather than increasing age, we studied a sample of healthy volunteers with a wide range of fitness levels, but a narrow age range. We assessed fitness by measuring the maximal oxygen uptake (VO2max) achieved during incremental bicycle exercise. Vagal modulation was assessed by calculating high frequency power (0.15-0.40 Hz) of the RR variability power spectrum from 24-h ECG recordings. We studied 37 healthy volunteers who were 22-44 yr old. In our sample, VO2max ranged from 25 to 70 mL/min/kg (mean of 45+/-13). Age was not significantly related to high frequency power, but VO2max was highly correlated with high frequency power (r=0.74, P=0.0001), indicating that physical fitness is strongly associated with vagal modulation. Thus, the decline in vagal modulation often attributed to increasing age may, instead, be the result of a decline in fitness. Verf.-Referat