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Int J Obes Relat Metab Disord. 1999 Aug;23(8):889-95.

Effects of exercise training and its cessation on components of the insulin resistance syndrome in obese children.

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Georgia Prevention Institute, Department of Pediatrics, Medical College of Georgia, Augusta 30912-3710, USA.



To determine the effect of exercise training (ET) on components of the insulin resistance syndrome (IRS) in obese children.


Randomized, modified cross-over study, with subjects assigned to one of two conditions: (1) 4 months of ET followed by 4 months of no-ET; or (2) 4 months of no-ET followed by 4 months of ET. Measurements were made at three time points: 0, 4 and 8 months.


79 obese, but otherwise healthy children (age: 7-11 y, percent fat (%fat) 27-61%).


Plasma lipid and lipoprotein concentrations, plasma insulin and glucose concentrations; %fat; submaximal heart rate (HR) as an index of fitness. EXERCISE TRAINING: ET was offered 5 d/week 40 min/d. For the 73 children who completed 4 months of ET, the mean attendance was 80% (that is, 4 d/week) and the average HR during ET was 157 bpm.


Significant (P < 0.05) group x time interactions were found for plasma triglyceride (TG) and insulin concentrations and %fat. The average change for both groups, from just before ET to just after the 4 month ET was -0.24 mmol.l-1 for TG, -25.4 pmol.l-1 for insulin and -1.6 units for %fat. When Group 1 ceased ET, over the following 4 month period the average change for insulin was +26.6 pmol.l-1 and for %fat +1.3 units.


Some components (plasma TG, insulin, %fat) of the IRS are improved as a result of 4 months of ET in obese children. However, the benefits of ET are lost when obese children become less active.

[Indexed for MEDLINE]

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