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Musculoskeletal and Estrogen Changes during the Adolescent Growth Spurt in Girls.
MedLine Citation:
PMID:  22843105     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The adolescent growth spurt is associated with rapid growth and hormonal changes, thought to contribute to the increased anterior cruciate ligament (ACL) injury risk in girls. However, relatively little is known about these musculoskeletal and estrogen changes during the growth spurt in girls. PURPOSE: To investigate the longitudinal changes in estrogen, as well as anterior knee laxity, and lower limb strength and flexibility throughout the adolescent growth spurt in girls. METHODS: Thirty-three healthy girls, aged 10-13 years, in Tanner Stage II and 4-6 months from their peak height velocity (PHV), were recruited. Participants were tested up to four times during the 12 months of their growth spurt, according to the timing of their maturity offset (Test 1: maturity offset = -4 to -6 months, Test 2: maturity offset = 0 months, Test 3: maturity offset = +4 months, Test 4: maturity offset = +8 months). During each testing session anterior knee laxity, lower limb flexibility and isokinetic strength, as well as saliva measures of estradiol concentration were measured. RESULTS: A significant (p = 0.002) effect of time of anterior knee laxity was found from the time of PHV, although no changes in estradiol concentration were displayed over time (p = 0.811). Participants displayed a significant increase (p < 0.05) in isokinetic quadriceps strength over time, with no apparent increase in isokinetic hamstring strength. CONCLUSIONS: We speculate that increased quadriceps strength, combined with increased knee laxity and no accompanying hamstring strength development during the adolescent growth spurt in girls, might contribute to a decrease in their knee joint stability during landing tasks. These musculoskeletal changes could potentially increase ACL injury risk at a time of rapid height and lower limb growth.
Authors:
Catherine Y Wild; Julie R Steele; Bridget J Munro
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-26
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Biomechanics Research Laboratory, School of Health Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia 2ARC Centre of Excellence in Electromaterials Science and Intelligent Polymer Research Institute, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
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