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J Pediatr. 2009 Jan;154(1):61-66.e1. doi: 10.1016/j.jpeds.2008.07.041. Epub 2008 Sep 10.

Are muscular and cardiovascular fitness partially programmed at birth? Role of body composition.

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  • 1Department of Medical Physiology, School of Medicine, University of Granada, Grenada, Spain. ortegaf@ugr.es

Abstract

OBJECTIVE:

To determine whether birth weight is associated with handgrip strength and cardiovascular fitness in adolescence and, if so, how these associations are influenced by current body composition.

STUDY DESIGN:

A total of 1801 adolescents (983 females), age 13 to 18.5 years, from the AVENA (Alimentación y Valoración del Estado Nutricional de los Adolescentes Españoles [Food and Assessment of the Nutritional Status of Spanish Adolescents]) study were evaluated. Handgrip strength and cardiovascular fitness were assessed using the handgrip test and the 20-m shuttle run test, respectively.

RESULTS:

Birth weight was positively associated with handgrip strength in females after controlling for current age, gestational age, breast-feeding, and adolescent body mass index (P = .002), body fat percentage (P < .001), or waist circumference (P = .005), but not after controlling for fat-free mass. The associations were similar yet weaker in males. Females with high birth weight (>90th percentile) had greater handgrip strength than those with normal (10th to 90th percentile) or low (<10th percentile) birth weight, after adjusting for body fat percentage (P = .004). All of the differences became nonsignificant after adjusting for adolescent fat-free mass. Birth weight was not associated with cardiovascular fitness.

CONCLUSIONS:

High birth weight is associated with greater handgrip strength in adolescents, especially in females, yet these associations seem to be highly explained by fat-free mass.

Comment in

PMID:
18783796
DOI:
10.1016/j.jpeds.2008.07.041
[PubMed - indexed for MEDLINE]
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