Prediction of maximal oxygen uptake by bioelectrical impedance analysis in overweight adolescents

M. D. Roberts, B. Drinkard, L. M. Ranzenhofer, C. G. Salaita, N. G. Sebring, S. M. Brady, C. Pinchbeck, J. Hoehl, L. B. Yanoff, D. M. Savastano, J. C. Han, J. A. Yanovski

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Aim. Maximal oxygen uptake (V̇O2max), the gold standard for measurement of cardiorespiratory fitness, is frequently difficult to assess in overweight individuals due to physical limitations. Reactance and resistance measures obtained from bioelectrical impedance analysis (BIA) have been suggested as easily obtainable predictors of cardiorespiratory fitness, but the accuracy with which ht2/Z can predict V̇O2max has not previously been examined in overweight adolescents. Methods. The impedance index was used as a predictor of V̇O2max in 87 overweight girls and 47 overweight boys ages 12 to 17 with mean BMI of 38.6±7.3 and 42.5±8.2 in girls and boys respectively. The Bland Altman procedure assessed agreement between predicted and actual V̇O2max. Results. Predicted V̇O2max was significantly correlated with measured V̇O2max (r2=0.48, P<0.0001). Using the Bland Altman procedure, there was significant magnitude bias (r2=0.10; P<0.002). The limits of agreement for predicted relative to actual V̇O2max were -589 to 574 mL O2/min. Conclusion. The impedance index was highly correlated with V̇O2max in overweight adolescents. However, using BIA data to predict maximal oxygen uptake over-predicted V̇O2max at low levels of oxygen consumption and under-predicted VO2max at high levels of oxygen consumption. This magnitude bias, along with the large limits of agreement of BIA-derived predicted VO2max, limit its usefulness in the clinical setting for overweight adolescents.

Original languageEnglish
Pages (from-to)240-245
Number of pages6
JournalJournal of Sports Medicine and Physical Fitness
Issue number3
StatePublished - Sep 2009
Externally publishedYes


  • Obesity
  • Pediatrics
  • Physical fitness


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