Document Detail


Secular change in muscular strength of indigenous rural youth 6-17 years in Oaxaca, southern Mexico: 1968-2000.
MedLine Citation:
PMID:  20141482     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: The study compared the grip strength of indigenous school youth 6-17 years of age in Oaxaca, southern Mexico, who were surveyed in 1968, 1978 and 2000. METHODS: Grip strength (Smedley/Stoelting) was measured to 0.5 kg in 1280 children and adolescent, 621 males and 659 females, in the three surveys. Height and weight were also measured. Strength of the right and left hands was summed to provide a general estimate of muscular strength. Summed grip strength was also expressed per unit body mass (kg/kg) and height (kg/m). Subjects were classified into four age groups: 6-8 years (childhood), 9-11 years (transition in adolescence), 12-14 years (early adolescence) and 15-17 years (later adolescence). Children 6-14 years were surveyed in 1968, 1978 and 2000 while adolescents 15-17 years were surveyed in 1978 and 2000. Sex-specific MANCOVAs were used for comparisons among years within age groups. RESULTS: Changes in grip strength between 1968 and 1978 among children 6-14 years were small and significant only in girls. Grip strength increased, on average, between 1978 and 2000 in boys 6-17 years but only in girls 6-14 years; adolescent girls 15-17 years in 1978 were stronger than those in 2000. Secular gains in muscular strength were generally proportional to secular gains in body weight and height. CONCLUSION: The data demonstrate secular changes in muscular strength in indigenous rural youth in a community in the process of transition from subsistence level agriculture to an economy less dependent upon agriculture.
Authors:
Robert M Malina; Maria Eugenia Pe?a Reyes; Swee Kheng Tan; Bertis B Little
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Annals of human biology     Volume:  37     ISSN:  1464-5033     ISO Abbreviation:  Ann. Hum. Biol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-02-23     Completed Date:  2010-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404024     Medline TA:  Ann Hum Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  168-84     Citation Subset:  IM    
Affiliation:
Department of Kinesiology and Health Education, University of Texas at Austin, and Tarleton State University, Stephenville, Texas, USA. rmalina@skyconnect.net
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Aging / physiology
Body Height
Body Weight
Child
Female
Hand Strength*
Humans
Male
Mexico
Population Groups*
Rural Population*
Sex Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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