BACKGROUND: Low vitamin D levels associated with obesity have reached an epidemic level all over the world. It has been supposed that the low serum level of vitamin D3 in obese subjects may be due to an increase in the uptake of vitamin D3 by adipose tissue. AIM: The current study aimed to investigate the effect of a specially designed exercise program for boosting lipolysis on the vitamin D level in obese children. METHODS: Thirty obese male children participated in the study. Their age was ranged from 9 to 11 years. The participants were assigned to two groups, group I (GI) who received endurance exercise (ENE) only and group II (GII) who received the specially designed exercise for increasing lipolysis (ENE preceded by resistance exercise). Free fatty acids (FFA), glycerol, and 25-OH-D were assessed before and immediately after exercise. RESULTS: FFA and glycerol showed a significant increase in both groups following exercise, while 25-OH-D showed a significant increase only in GII. GII showed significantly higher levels of FFA, glycerol, and 25-OH-D following exercise when it was compared to GI. CONCLUSION: The application of resistance training before ENE could improve the vitamin D status through increasing the lipolytic activities more than the application of endurance exercise alone.

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