Pediatric Brief Communication
International Journal of Obesity (2006) 30, 45–49. doi:10.1038/sj.ijo.0803171; published online 15 November 2005
Cardiovascular fitness and physical activity in children with and without impaired glucose tolerance
G Q Shaibi1, G D C Ball2, M L Cruz3, M J Weigensberg4, G J Salem1 and M I Goran3,5
- 1Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, USA
- 2Department of Pediatrics, University of Alberta, Edmonton, AB, Canada
- 3Department of Preventive Medicine, University of Southern California, Los Angeles, CA, USA
- 4Department of Pediatrics, University of Southern California, Los Angeles, CA, USA
- 5Department of Physiology and Biophysics, University of Southern California, Los Angeles, CA, USA
Correspondence: Dr MI Goran, Professor of Preventive Medicine and Physiology & Biophysics, Keck School of Medicine, University of Southern California, 1540 Alcazar Street, Room 208-D, Los Angeles, CA 90033, USA. E-mail: goran@usc.edu
Received 7 January 2005; Revised 9 July 2005; Accepted 8 August 2005; Published online 15 November 2005.
Abstract
Objective:
To examine differences in cardiovascular fitness (VO2max) and physical activity levels in overweight Hispanic children with normal glucose tolerance (NGT) vs impaired glucose tolerance (IGT).
Participants:
A total of 173 overweight (BMI percentile 97.0
3.1) Hispanic children ages 8–13 years with a family history of type 2 diabetes.
Methods:
VO2max was measured via a maximal effort treadmill test and open circuit spirometry. Physical activity was determined by questionnaire. Glucose tolerance was established by a 2-h oral glucose challenge (1.75 g of glucose/kg body weight). IGT was defined from an oral glucose tolerance test as a 2-h plasma glucose level 
140 and <200 mg/dl.
Results:
IGT was detected in 46 of the 173 participants (
27%); no cases of type 2 diabetes were identified. No significant differences were found between youth with NGT and those with IGT in absolute VO2max (2.20.6 vs 2.10.5 l/min), VO2max adjusted for gender, age, and body composition (2.20.2 vs 2.10.2 l/min), or recreational physical activity levels (8.78.2 vs 6.96.2 h/week).
Conclusion:
Overweight Hispanic youth with IGT exhibit similar levels of VO2max and physical activity compared to their NGT counterparts. Longitudinal analyses are necessary to determine whether fitness/activity measures contribute significantly to diabetes risk over time in this group.
Keywords:
youth, pre-diabetes, insulin resistance
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