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Clin Physiol Funct Imaging. 2015 Nov;35(6):469-77. doi: 10.1111/cpf.12185. Epub 2014 Aug 27.

Measures of cardiorespiratory fitness in relation to measures of body size and composition among children.

Author information

  • 1Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital and University of Eastern Finland, Kuopio, Finland.
  • 2Institute of Biomedicine/Physiology, University of Eastern Finland, Kuopio, Finland.
  • 3Kuopio Research Institute of Exercise Medicine, Kuopio, Finland.
  • 4Department of Internal Medicine, Kuopio University Hospital, Kuopio, Finland.
  • 5Department of Pediatrics, Kuopio University Hospital and University of Eastern Finland, Kuopio, Finland.

Abstract

BACKGROUND:

In the exercise testing measures of cardiorespiratory fitness need to be scaled by body size or composition to enable comparison between individuals. Traditionally used weight-proportional measures are potentially confounded by body adiposity that hampers their interpretation and applicability in the clinical assessment of cardiorespiratory fitness.

OBJECTIVE:

We aimed to find the most appropriate measure of body size or composition for scaling of measures of cardiorespiratory fitness among children.

METHODS:

We assessed body weight and height, maximal workload (W MAX ) and maximal oxygen uptake (VO2 MAX ) using cycle ergometer exercise test with respiratory gas analysis and body lean mass (LM) and fat mass (FM) by dual-energy X-ray absorptiometry and by bioimpedance analysis among 38 children. The data were analysed using Pearson's coefficients for correlation and stepwise linear regression models.

RESULTS:

Lean mass (r > 0.54) and height (r > 0.51) had stronger positive correlations with absolute W MAX and VO2 MAX than weight (r > 0.30) in girls and boys. None of the measures of body size or composition correlated with LM-proportional W MAX or VO2 MAX in girls or boys. Only LM correlated positively with height-proportional W MAX (r = 0.65) and VO2 MAX (r = 0.71) in boys. FM correlated negatively with weight-proportional W MAX (r < -0.58) and VO2 MAX (r < -0.64) in girls and boys. FM was even stronger determinant of weight-proportional W MAX (β = -0.68) and VO2 MAX (β = -0.61) than exercise performance in multivariate linear regression models.

CONCLUSIONS:

While assessing cardiorespiratory fitness, LM is the most appropriate measure of body size or composition for scaling of W MAX and VO2 MAX, because scaling by body weight introduces confounding by body adiposity.

KEYWORDS:

adiposity; ergometer; exercise testing; lean mass; maximal oxygen uptake; maximal workload

PMID:
25164157
DOI:
10.1111/cpf.12185
[PubMed - indexed for MEDLINE]
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