Body Composition and Cardiorespiratory Fitness Indicators in Prepubescent Boys and Girls

Abstract

Relations between frequently used indicators of cardiorespiratory fitness, sex and body composition were studied in a birth-cohort based sample of young prepubescent children (age range: 6.8 - 8.2 years). The Bruce treadmill test was used to assess submaximal heart rate, endurance time (ET), calculated total work (W_total) and maximal power output (P_max) in 100 children (50 boys, 50 girls). Body composition was determined by skinfold measurements. In 17 children, maximal oxygen consumption was measured. Percent body fat was negatively associated with ET and relative oxygen uptake (ml × min^-1 × kg^-1) and was positively related to submaximal heart rate at 6 minutes exercise (HR6). Fat-free mass was positively related to W_total, P_max and absolute oxygen uptake (ml × min^-1). Relative oxygen uptake (ml × min^-1 × kg^-1) was related to ET. Absolute oxygen uptake (ml × min^-1) was related to W_total and P_max. The observed differences in indicators of cardiorespiratory fitness between boys and girls were largely attributable to a difference in body composition. The results further demonstrate that when oxygen uptake measurement is not feasible, W_total or P_max (expressed per kilogram fat-free mass) seem to provide better indicators of aerobic power than endurance time.

Body composition · child · fitness, treadmill · oxygen uptake

References

• 1 Armstrong N, Kirby B J, McManus A M, Welsman J W. Prepubescents’ ventilatory responses to exercise with reference to sex and body size.  CHEST. 1997;  112 1554-1560
• 2 Astrand P O, Rodahl K. Textbook of Work Physiology. New York; McGraw-Hill 1986
• 3 Baranowski T, Bryan G T, Harrison J A, Rassin D K, Greaves K A, Baranowski J H. Height, infant-feeding practices and cardiovascular functioning among 3 to 4 year old children in three ethnic groups.  J Clin Epidemiol. 1992;  45 513-518
• 4 Binkhorst R A, Saris W HM, Noordeloos A M, van’t Hof M A, de Haan A FJ. Maximal oxygen consumption of children (6 to 18 years) predicted from maximal and submaximal values in treadmill and bicycle tests.  In: Mocellin R, Klimt F (eds). Children and Exercise XII Champaign; Human Kinetics Publishers 1986: 227-232
• 5 Binkhorst R A, van’t Hof M A, Saris W HM. Maximum exercise in children: reference-values for 6 - 18 year old girls and boys [Dutch]. The Hague; Dutch Heart Association 1992
• 6 Boileau R A, Lohman T G, Slauther M H, Ball T E, Going S B, Hendrix M K. Hydration of the fat-free body in children during maturation.  Hum Biol. 1984;  56 651-666
• 7 Bruce R A, Kusumi F, Hosmer D. Maximal oxygen uptake and nomographic assessment of functional aerobic impairment in cardiovascular disease.  Am Heart J. 1973;  85 546-362
• 8 Cumming G R, Everatt D, Hastman L. Bruce treadmill test in children: normal values in a clinic population.  Am J Cardiol. 1978;  41 69-75
• 9 Cumming G R, Hastman L, McCort J. Treadmill endurance times, blood lactate, and exercise blood pressures in normal children. In: Children and Exercise XII. Mocellin R, Klimt F (eds) Champaign; Human Kinetics Publishers 1986: 140-150
• 10 Fomon S J, Haschke F, Ziegler E E, Nelson S E. Body composition of reference children from birth to 10 years.  Am J Clin Nutr. 1982;  35 1169-1175
• 11 Fredriks A M, van Buuren S, Wit J M, Verloove-Vanhorick S P. Body index measurements in 1996 - 7 compared with 1980.  Arch Dis Child. 2000;  82 107-112
• 12 Gerver W JM, de Bruin R. Paediatric Morphometrics: A Reference Manual. Utrecht; Bunge 1996
• 13 Gillum R F. The relationship of treadmill test performance to blood pressure and other cardiovascular risk factors in adolescents.  Am Heart J. 1989;  118 161-171
• 14 Goran M, Fields D A, Hunter G R, Herd S L, Weisner R L. Total body fat does not influence maximal aerobic capacity.  Int J Obes. 2000;  24 841-848
• 15 Gulmans V AM, de Meer K, Binkhorst R A, Helders P JM, Saris W HM. Reference values for maximum work capacity in relation to body composition in healthy Dutch children.  Eur Respir J. 1997;  10 94-97
• 16 Gutin B, Basch C, Shea S, Contento I, DeLozier M, Rips J, Irigoyen M, Zybert P. Blood pressure, fitness, and fatness in 5- and 6-year old children.  JAMA. 1990;  264 1123-1127
• 17 Houlsby W T. Functional aerobic capacity and body size.  Arch Dis Child. 1986;  61 388-393
• 18 Maffulli N, Greco R, Greco L, D’Alterio D. Treadmill exercise in Neapolitan children and adolescents.  Acta Paediatr. 1994;  83 106-112
• 19 McArdle W D, Katch F I, Katch V L. Exercise physiology: energy, nutrition, and human performance. Baltimore; Williams and Wilkins 1996: 204-207
• 20 Saris W HM, Noordenloos A M, Ringnalda B EM, Van ’t Hof M A, Binkhorst R A. Reference values for aerobic power of healthy 4- to 18-year-old Dutch children: preliminary results.  In: Mocellin R, Klimt F (eds). Children and Exercise XII Champaign; Human Kinetics Publishers 1986: 151-160
• 21 Sidney S, Haskell W L, Crow R, Sternfeld B, Oberman A, Armstrong M A, Cutter G R, Jacobs D R, Savage P J, Van Horn L. Symptom-limited graded treadmill exercise testing in young adults in the CARDIA study.  Med Sci Sports Exerc. 1992;  24 177-183
• 22 Treuth M S, Figueroa-Colon R, Hunter G R, Weinsier R L, Butte N F, Goran M I. Energy expenditure and physical fitness in overweight vs. non-overweight prepubertal girls.  Int J Obes. 1998;  22 440-447
• 23 Troiano R P, Flegal K M, Kuczmarski R J, Campbell S M, Johnson C L. Overweight prevalence in trends for children and adolescents. The National Health and Nutrition Surveys 1963 - 1991.  Arch Pediatr Adolesc Med. 1995;  149 1085-1091
• 24 Weststrate J A, Deurenberg P. Body composition in children: proposal for a method for calculating body fat percentage from total body density or skinfold-thickness measurements.  Am J Clin Nutr. 1989;  50 1104-1115