Effects of exercise-induced weight loss on acylated and unacylated ghrelin in overweight children.
OBJECTIVE
Controversial data on ghrelin concentration during exercise in human subjects have been published. We tested the hypothesis that exercise could affect acylated ghrelin (AG) and unacylated ghrelin (UAG), which could partly explain the previously reported inconsistent findings on the association of exercise with changes in ghrelin.


METHODS
A prospective randomized study.


METHODS
We randomized 17 overweight volunteers (11-year-old boys) to a 12-week combined exercise group (EG, n = 8) or control group (CG, n = 9). At baseline, 1, 4 and 12 weeks, we measured body weight and composition, insulin, leptin, total ghrelin and acylated ghrelin.


RESULTS
Compared with the CG, body weight, percentage body fat and homeostatic model assessment (HOMA) indices were significantly lower throughout the 12 weeks in the EG. Total ghrelin and UAG levels gradually increased to 131.9 +/- 5.2% and 130.4 +/- 5.2% of baseline, respectively, at week 12 in the EG, whereas AG concentration remained unchanged throughout the 12 weeks both within each group and between the groups. At week 12, there were differences in the total ghrelin level and UAG level between the groups.


CONCLUSIONS
This study shows an increase in unacylated acylated ghrelin and unchanged acylated ghrelin after a 12-week combined exercise programme in overweight children. These findings provide evidence of favourable effects of exercise on improving energy metabolism.
Kim
Hyun Jun
HJ
Department of Physical Education, Pusan National University College of Education, Busan, Korea.
Lee
Sangyeoup
S
Kim
Tae Wun
TW
Kim
Hyoung Hoi
HH
Jeon
Tae Yong
TY
Yoon
Yeong Sook
YS
Oh
Sang Woo
SW
Kwak
Hyun
H
Lee
Jae Gue
JG
D000215:Acylation; D002648:Child; D005081:Exercise Therapy; D054439:Ghrelin / Q000378:metabolism*; D006801:Humans; D007723:Korea; D008297:Male; D050177:Overweight / Q000378:metabolism / Q000628:therapy*; D011446:Prospective Studies; D015431:Weight Loss
D054439:Ghrelin