Title: | Fatness but Not Fitness Relative to the Fat-Free Mass Is Related to C-Reactive Protein in 18 Year-Old Adolescents |
Author: |
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Date: | 2015-06-15 |
Language: | English |
Scope: | 1-14 |
University/Institute: | Háskóli Íslands University of Iceland |
School: | Menntavísindasvið (HÍ) School of Education (UI) |
Department: | Íþrótta-, tómstunda- og þroskaþjálfadeild (HÍ) Faculty of Sport, Leisure Studies and Social Education (UI) |
Series: | Plos One;10(6) |
ISSN: | 1932-6203 |
DOI: | 10.1371/journal.pone.0130597 |
Subject: | Offita; Heilsufar; Ungt fólk; Unglingar |
URI: | https://hdl.handle.net/20.500.11815/195 |
Citation:Hinriksdóttir G, Tryggvadóttir Á, Ólafsdóttir AS, Arngrímsson SÁ (2015) Fatness but Not Fitness Relative to the Fat-Free Mass Is Related to C-Reactive Protein in 18 Year-Old Adolescents. PLoS ONE 10(6): e0130597. doi:10.1371/journal.pone.0130597
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Abstract:Introduction
The interaction between fatness, fitness, and C-reactive protein (CRP) in adolescents is not
well characterized but may be important to prevent low grade inflammation. The purpose of
this study was to assess the relationship between adiposity, different expressions of fitness, and CRP in late adolescence using direct measures of fitness and fatness.
Methods
Anthropometric measurements were taken on 245 eighteen-year-old participants (116
girls). Fasting CRP, glucose, and insulin were measured and homeostatic model assess-
ment (HOMA) calculated. Body composition was estimated via dual energy X-ray absorpti-
ometry. Fitness was assessed with maximal oxygen uptake (VO2max) during a treadmill
test and also expressed relative to the fat-free mass (VO2maxFFM).
Results
Prevalence of overweight/obesity based on body mass index (BMI) was 20.7% and 25.6% among girls and boys, respectively (p = 0.407), but 42.5% and 58.1% when based on body fat percentage (%fat, p = 0.015). Higher proportion of boys (81.3%) than girls (54.5%) were highly fit (p<0.001), but the percentage of girls with high levels of CRP was greater (12.1% vs 6.2%, p = 0.028). Adiposity, indicated with BMI, waist circumference, fat mass, android fat mass (aFM), or %fat, was positively associated with CRP independent of VO2max (r = 0.13-0.18, p<0.05) and VO2maxFFM (r = 0.24-0.32, p<0.001). VO2max, was negatively associated with CRP independent only of BMI and waist circumference (r = -0.21, p = 0.001), but not %fat, fat mass or aFM (r = -0.08 to -0.12, p>0.05). VO2maxFFM was unrelated to CRP with (r = -0.07 to -0.11, p>0.05) or without (r = -0.10, p = 0.142) adjustment for adiposity. Additional adjustment for HOMA did not change any of the relationships, although the coefficients were attenuated.
Conclusions
Fatness has a greater association with CRP than fitness in late adolescence. However, VO2maxFFM, which is truly independent of adiposity, is unrelated to CRP, indicating that the effects of fitness might be mediated via the fatness component embedded in fitness expressed relative to body mass.
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Rights:CC BY
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