Comparing the effects of combined endurance-resistance training versus resistance-endurance on growth hormone and insulin-like growth factor-I in non-athlete prepubertal girls

Amirsasan, R. and Sari-Sarraf, V. and Pourgholi, T. and Armanfar, M. (2015) Comparing the effects of combined endurance-resistance training versus resistance-endurance on growth hormone and insulin-like growth factor-I in non-athlete prepubertal girls. Feyz Journal of Kashan University of Medical Sciences, 19.

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Official URL: http://feyz.kaums.ac.ir/article-1-2703-en.html
DOI: UNSPECIFIED

Abstract

Background: In children and adolescents, the anabolic effects of exercise are mediated through growth hormone (GH) and insulin-like growth factor-I (IGF-I). Therefore, this study aimed to compare the effects of combined endurance-resistance versus resistance-endurance exercises on GH and IGF-I in non-athlete prepubertal girls. Materials and Methods: In this semi-experimental study, 16 prepubertal girls aged 9-11 years old, after homogenization, were randomly allocated into two equal groups (n=8): the endurance-resistance and resistance-endurance. Activities in both groups included combined endurance (20 minutes of moderate-intensity aerobic exercise with 60-70 of the maximal oxygen uptake (VO2max) on a treadmill)-resistance (biceps, triceps, chest press, butterfly, knee extension and flexion, moderate leg press with 60 of 1-RM, and 1 set of 10 repetitions) and resistance-endurance training with different orders. Before, immediately after and 2 hours after the exercise, blood samples were taken and GH and IGF-1 levels were measured. Results: Immediately after the training, in both group, GH levels (3.39 ng/ml vs 1.8 ng/ml) were significantly increased compared to the resting condition (0.77 ng/ml vs 0.72 ng/ml) (P=0.017). However, GH levels (0.97 ng/ml vs 0.18 ng/ml) were significantly decreased in both groups after 2 hours (P=0.012). The GH levels in the endurance-resistance group were higher compared to the resistance-endurance group. Changes in IGF-1 levels in both training groups before, immediately after and 2 hours after the training did not show significant differences.Conclusion: It seems that combined endurance-resistance training is more appropriate option for non-athlete prepubertal girls.

Item Type: Article
Subjects: Medicine
Divisions: Feyz journal
Depositing User: ART . editor
Date Deposited: 07 May 2017 12:54
Last Modified: 06 Jun 2017 18:11
URI: http://eprints.kaums.ac.ir/id/eprint/1549

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