NDLI: The effect of training in male prepubertal and pubertal monozygotic twins

Content Provider	Springer Nature Link
Author	Danis, Apostolos Kyriazis, Yannis Klissouras, Vassilis
Copyright Year	2003
Abstract	Nine male pairs of monozygotic twins aged 11–14 years, height 147 (7.6) cm and body mass 39.7 (9.6) kg, participated in this study. Twin zygocity was tested using morphological, dermatoglyphic and hematologic methods, and Tanner's five stages were used for the evaluation of biological maturation. One twin from each pair undertook training for 6 months, three times a week, with running at 85–120% of the lactate anaerobic threshold (LT). Anthropometrics, determination of maximum O2 uptake (V˙O2max), LT and maximal blood lactate concentration ([La]max) was carried out before, during and after training. No significant difference existed between the trained twins and their untrained brothers before training. After training, the trained twins increased their V˙O2max (per kg body mass) by 10.6% and their LT by 18.2% (P<0.01), reaching values that differed significantly from those of their untrained brothers [57.5 (3.6) ml·kg−1·min−1 vs 55.4 (3.3) ml·kg−1·min−1 and 13.4 (1.1) km·h−1 vs 12.7 (1.1) km·h−1, respectively]. In addition, in the trained twins relative body fat was reduced (P<0.05) from 17.8 to 16.2% and their somatotype altered significantly (decrease of endomorphy and mesomorphy and increase of ectomorphy), while in the untrained twins there was no change in these parameters. Both groups of twins significantly increased their absolute V˙O2max after the 6 months of training, the trained by 14,9% [from 2.08 (0.43) to 2.37 (0.45) l·min−1] and the untrained by 10.5% [from 2.10 (0.41) to 2.32 (0.47) l·min−1], but no difference was registered between them. A comparison of the intrapair changes in V˙O2max of prepubertal and pubertal twins showed an influence of training in the prepubertal (19.3% vs 5.2%) but not in the pubertal twins (12.7% vs 13.1%). Using analysis of variance, the relative importance of training, heredity and their interaction was evaluated to be 20%, 70% and 10%, respectively, for the change in body fat, 35%, 45% and 20%, respectively, for the change in relative V˙O2max and 25–30%, 50–60% and 15–20%, respectively, for the change in LT. In conclusion, training during pubertal growth can favour aerobic power (depending on body composition) as well as aerobic capacity, but it has no effect on absolute V˙O2max. Genetic control seems to have a strong effect on the extent of adaptations, and the genotype—training interaction explains a small, but prominent part of them.
Starting Page	309
Ending Page	318
Page Count	10
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	89
Issue Number	3
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-03-14
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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