NDLI: Effects of improvement in aerobic power on resting insulin and glucose concentrations in children

Content Provider	Springer Nature Link
Author	McMurray, Robert G. Bauman, M. J. Harrell, J. S. Brown, S. Bangdiwala, S. I.
Copyright Year	2000
Abstract	In this study we determined the influence of improving aerobic power (V˙O2max) on basal plasma levels of insulin and glucose of 11- to 14-year-old children, while accounting for body fat, gender, pubertal status, and leisure-time physical activity (LTPA) levels. Blood samples were obtained from 349 children after an overnight fast and analyzed for plasma insulin and glucose. Height, mass, body mass index (BMI), and sum of skinfolds (Σ triceps + subscapular sites) were measured. LTPA levels and pubertal status were estimated from questionnaires, and V˙O2max was predicted from a cycle ergometry test. Regardless of gender, insulin levels were significantly correlated (P = 0.0001) to BMI, skinfolds, pubertal stage, and predicted V˙O2max, but were not related to LTPA levels. Fasting glucose levels were not correlated to measures of adiposity or exercise (LTPA score, V˙O2max) for females; however, BMI and skinfolds were correlated for males (P < 0.006). The children then took part in an 8-week aerobic exercise program. The 60 children whose V˙O2max improved (≥3 ml · kg−1 · min−1) had a greater reduction in circulating insulin than the 204 children whose V˙O2max did not increase −16 (41) vs −1 (63) pmol · l−1; P = 0.028. The greatest change occurred in those children with the highest initial resting insulin levels. Plasma glucose levels were slightly reduced only in those children with the highest insulin levels whose V˙O2max improved (P < 0.0506). The results of this study indicate that in children, adiposity has the most significant influence on fasting insulin levels; however, increasing V˙O2max via exercise can lower insulin levels in those children with initially high levels of the hormone. In addition, LTPA does not appear to be associated with fasting insulin status, unless it is sufficient to increase V˙O2max.
Starting Page	132
Ending Page	139
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	81
Issue Number	1
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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