Comparing the Relationship between Resting Metabolic rate and Body Composition Factors in Obese and Normal Weight Gymnast Children

Document Type: original article

Authors

1 Ph.D Student of Sport Physiology, Department of Physical Education and Sport Sciences, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.

2 Assistant professor of Physical Education and Sport Sciences, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.

3 Professor of Physical Education and Sport Sciences, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.

4 Associate Professor of Biology, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran.

10.22038/ijp.2020.50908.4042

Abstract

Background
The background of most metabolic diseases is obesity and overweight. The purpose of this study was to compare the relationship between resting metabolic rate and body composition factors in obese and normal-weight gymnast children.
Materials and Methods
In this semi-experimental study, 20 obese and 21 normal-weight boys age 8 to 12 year old participated in the study. In the first session, anthropometrical (weight, height, waist to hip ratio (WHR), and body composition [(body fat percentage (BF%), body fat weight (BFW), and lean body weight (LBW)] data were measured. In the next session, at first, subjects rested for 15 min and then performed a modified Bulk exhausting test. The subjects were connected to the mouthpiece of gas analyzer throughout the rest and exhausting test andthemaximal oxygen consumption (VO2max), respiratory exchange ratio (RER), and resting metabolic rate (RMR) was measured in both groups.
Results
 A significant difference was observed for a mean of VO2max, weight, BF%, BFW, LBW, and WHR between the two groups (P<0.001). The mean of RMR per kg body weight was significantly lower in the obese group than the normal-weight group (P<0.05). There was no significant difference in the RER variable between the two groups (P>0.05). There was a significant linear relationship between RMR with weight, WHR, BFW, LBW, and VO2max in the obese group (P≤0.05).
Conclusion
Based on the results of the present study it can be concluded that the difference between the weight of obese and normal-weight beginner gymnastics children is partly due to low RMR and lower RMR in obese children might be due to their low cardiorespiratory fitness.

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