Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2006) 05, 424 - 430

Research article
Effect of Intermittent Sub-Maximal Exercise on Percent Body Fat Using Leg-To-Leg Bioelectrical Impedance Analysis in Children
Joseph L. Andreacci1, , Curt B. Dixon2, Christina Ledezma1, Fredric L. Goss3
Author Information
1 Department of Exercise Science, Bloomsburg University, Bloomsburg, PA, USA
2 Department of Health Science at Lock Haven University, Lock Haven, PA, USA
3 Center for Exercise and Health-Fitness Research, University of Pittsburgh, Pittsburgh, PA, USA

Joseph L. Andreacci
✉ 132 Centennial Hall, Bloomsburg University, 400 East Second Street, Bloomsburg, PA 17815, USA
Publish Date
Received: 05-05-2006
Accepted: 21-07-2006
Published (online): 01-09-2006
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The purpose of this investigation was to determine the effect of intermittent sub-maximal exercise on percent body fat (%BF) estimated by leg-to-leg bioelectrical impedance analysis (LBIA) in children. Fifty-nine children (29 girls; 30 boys) mean age 9.0 ± 1.3 years participated in this study. LBIA measured %BF values were obtained immediately before and within five minutes after completing an intermittent exercise protocol consisting of three 8-minute sub-maximal exercise bouts (2.74 km·hr-1, 0% grade; 4.03 km·hr-1, 0% grade; and 5.47 km·hr-1, 0% grade) each separated by a 5-min seated rest period. The three exercise bouts corresponded to 56%, 61% and 71% of maximal heart rate. Significant differences (p < 0.001) were observed for fat mass, fat free mass, total body water, and body weight, post-exercise in both groups. Significant reductions (p < 0.001) in %BF were observed post-exercise in the female (23.1 ± 9.9 vs. 21.8 ± 9. 9 %) and male (23.3 ± 10.5 vs. 21.8 ± 10.2 %) children when compared to pre-exercise values. However, for the majority of the subjects (females = 86%; males = 73%) the decrease in %BF post- exercise was less than 2.0 %BF. These data indicate that sub-maximal intermittent exercise, that may be representative of daily free-form activities in children, will most likely have a limited impact on %BF estimates when the assessment is performed immediately post-exercise.

Key words: Bioelectrical impedance analysis, body fat, sub-maximal exercise, children

           Key Points
  • LBIA measures of body weight, percent body fat, fat mass, fat free mass and total body water were significantly lower after the intermittent sub-maximal exercise.
  • The reductions in percent body fat for girls (1.4%) and boys (1.5%) compare favorably to previous investigations.
  • Intermittent exercise, that may be representative of daily free-form activities in children, will most likely have a limited impact on LBIA percent body fat estimates
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