Background: Pressure among young athletes to meet body composition goals may lead to poor nutrition and affect growth. Aims: To examine the proportion of body fat (%BF), measured by bioimpedance analysis, among Latvian children and adolescents participating in organized sports. Methods: Our study had a nationally representative sample of 6048 young athletes, aged 10–17 years. Their %BF was measured using a multifrequency, 8-pole, bioelectrical impedance leg-to-hand analyzer. Results: About 19.2% (CI 14.4–20.0) of boys and 15.1% (CI 14.0–16.3) of girls had a %BF value below the recommended levels. The %BF in young female athletes participating in aesthetic sports was lower than among their peers participating in other sports. Young male athletes participating in aesthetic sports had lower %BF levels at 10 and 12 years of age, compared with participants in weight-class sports; and lower levels of %BF from age 10–14 years, compared with participants in non-weight-sensitive sports. Conclusions: Almost every fifth child and adolescent participating in organized sports displayed critically low body fat levels. Body fat needs to be assessed regularly in young athletes, to prevent negative consequences on health.
American Academy of Pediatrics, Committee on Nutrition. Sports nutrition. In: KleinmanRE (ed) Pediatric nutrition handbook. 5th ed.Elk Grove Village, IL: American Academy of Pediatrics, 2004, pp.155–66.
2.
AcklandTRLohmanTGSundgot-BorgenJ. Current status of body composition assessment in sport: Review and position statement on behalf of the Ad Hoc Research Working Group on Body Composition, Health and Performance; under the auspices of the IOC Medical Commission. Sports Med2012;42:227–49.
3.
DolanEO’ConnorHMcGoldrickA. Nutritional, lifestyle and weight control practices of professional jockeys. J Sports Sci2011;29:791–9.
4.
Sundgot-BorgenJMeyerNLLohmanTG. How to minimise the health risks to athletes who compete in weight-sensitive sports: Review and position statement on behalf of the Ad Hoc Research Working Group on Body Composition, Health and Performance; under the auspices of the IOC Medical Commission. Br J Sports Med2013;47:1012–22.
5.
Sundgot-BorgenJTorstveitMK. Aspects of disordered eating continuum in elite high-intensity sports. Scand J Med Sci Sports2010;20:112–21.
6.
American Psychiatric Association. Practice guideline for the treatment of patients with eating disorders. Am J Psychiatry2000;157:S1–39.
7.
CobbKLBachrachLKGreendaleG. Disordered eating, menstrual irregularity and bone mineral density in female runners. Med Sci Sports Exerc2003;35:711–9.
8.
RomeESAmmermanSRosenDS. Children and adolescents with eating disorders: The state of the art. Pediatrics2003;111:98–108.
9.
Sundgot-BorgenJTorstveitMK. The female football player, disordered eating, menstrual function and bone health. Br J Sports Med2007;41:S168–72.
10.
SawyerMSSigelESilberTJ. Children and adolescents with eating disorders: The state of the art. Pediatrics2003;111: E98–108.
11.
Committee on Sports Medicine and Fitness. Promotion of healthy weight-control practices in young athletes. Pediatrics2005;116:1557–64.
12.
RodriguezNRDi MarcoNMLangleyS. American College of Sports Medicine position stand. Nutrition and athletic performance. Med Sci Sports Exerc2009;41:709–31.
13.
De BruinAPOudejansRRDBakkerFC. Dieting and body image in aesthetic sports: A comparison of Dutch female gymnasts and non-aesthetic sport participation. Psychol Sports Exerc2007;8:507–20.
14.
MatthieJR. Bioimpedance measurements of human body composition: Critical analysis and outlook. Expert Rev Med Dev2008;5:239–61.
15.
JohnstonJLLeongMSChecklandEG. Body fat assessed from body density and estimated from skinfold thickness in normal children and children with cystic fibrosis. Am J Clin Nutr1988;48:1362–6.
16.
McCarthyHDColeTJFryT. Body fat reference curves for children. Int J Obes2006;30:598–602.
17.
US National Institutes of Health (NIH). Bioelectrical impedance analysis in body composition measurement. NIH Technology Assessment Statement, 12–14December1994, pp. 1–35.
18.
MolinariLGasserTLargoR. A comparison of skeletal maturity and growth. Ann Hum Biol2013;40:333–40.
19.
NahhasRWSherwoodRJChumleaWC. Predicting the timing of maturational spurts in skeletal age. Am J Phys Anthropol2013;150:68–75.
20.
HögströmGMPietiläTNordströmP. Body composition and performance: Influence of sport and gender among adolescents. J Strength Cond Res2012;26:1799–804.
21.
MüllerW. Towards research based approaches for solving body composition in sports: Ski jumping as a heuristic example. Br J Sports Med2009;43:1013–9.
LuqueVClosa-MonasteroloRRubio-TorrentsC. Bioimpedance in 7-year-old children: Validation by dual X-ray absorptiometry. Part 1: Assessment of whole body composition. Ann Nutr Metab2014;64:113–21.
24.
CaineDLewisRO’ConnorP. Does gymnastics training inhibit growth of females?Clin J Sport Med2001;11:260–70.
25.
KriemlerSPuderJZahnerL. Cross-validation of bioelectrical impedance analysis for the assessment of body composition in a representative sample of 6- to 13-year-old children. Eur J Clin Nutr2008;63:619–26.
26.
MontagneseCWilliamsJEHarounD. Is a single bioelectrical impedance equation valid for children of wide ranges of age, pubertal status and nutritional status? Evidence from the 4-component model. Eur J Clin Nutr2013;67:S34–9.
27.
WellsJCKWilliamsJEFewtrellM. A simplified approach to analyzing bio-electrical impedance data in epidemiological surveys. Int J Obes2007;31:507–14.
28.
MeyerNLSundgot-BorgenJLohmanTG. Body composition for health and performance: A survey of body composition assessment practice carried out by the Ad Hoc Research Working Group on Body Composition, Health and Performance; under the auspices of the IOC Medical Commission. Br J Sports Med2013;47:1044–53.
29.
MoonJR. Body composition in athletes and sports nutrition: An examination of the bioimpedance analysis technique. Eur J Clin Nutr2013;67:S54–9.
30.
SluyterJDSchaafDScraggRK. Prediction of fatness by standing 8-electrode bioimpedance: A multiethnic adolescent population. Obesity2010;18:183–9.
