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Quantifying the relationship between mechanical loading and the skeletal response in pre- and early-pubertal girls

Saxon, L., Iuliano-Burns, S., Naughton, G., Daly, R. and Bass, S. 2003, Quantifying the relationship between mechanical loading and the skeletal response in pre- and early-pubertal girls, in MSSE 2003 : Medicine & Science in Sports & Exercise : Abstract Issue, Lippincott WIlliams & Wilkins, San Francisco, Calif., pp. s13-s13.

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Title Quantifying the relationship between mechanical loading and the skeletal response in pre- and early-pubertal girls
Author(s) Saxon, L.
Iuliano-Burns, S.
Naughton, G.
Daly, R.
Bass, S.
Conference name Medicine & Science in Sports & Exercise Annual Meeting (2003 : San Francisco, Calif.)
Conference location San Francisco, Calif.
Conference dates Jun. 2003
Title of proceedings MSSE 2003 : Medicine & Science in Sports & Exercise : Abstract Issue
Publication date 2003
Start page s13
End page s13
Publisher Lippincott WIlliams & Wilkins
Place of publication San Francisco, Calif.
Summary PURPOSE
Before exercise prescription for bone health can be recommended, the relationship between mechanical loading characteristics and the skeletal response need to be quantified. We asked i) does moderate impact exercise result in a greater gain in BMC than low impact exercise, ii) what are the loading characteristics associated with a moderate and low impact exercise program and does this differ from non-structured play?, and iii) does loading history affect the osteogenic response to a moderate or low impact program?

METHODS
Sixty-eight pre- and early-pubertal girls (aged 8.9 +/- 0.2 yrs) were randomized to take part in a moderate or low impact exercise program 3 times/wk for 8.5 mnths. The number and type of loads associated with the exercise classes and non-structured play (recess) were assessed from video footage. The magnitude of load was assessed using a pedar in-sole mobile system. Hours of moderate and high impact organized sport were assessed from a physical activity questionnaire.

RESULTS
The moderate and low impact exercise programs consisted of -400 impacts per class, but the jumping, hopping and dynamic activities performed during the moderate impact program produced forces ranging from 2 to 4 times body weight (BW) compared to -1 BW for the low impact program. Moderate impact exercise resulted in a 2.7% greater gain in BMC at the tibia compared to the low impact exercise. The moderate impact exercise program consisted of fewer low impacts (1-2 BW) and a higher number of moderate impacts (2-4BW) compared to those typically performed during non-structured play. There were greater gains in BMC in subjects participating in the moderate versus the low impact exercise programs who participated in 2 to 3 hours of moderate impact sports outside school (2.5% to 4.5%, p

CONCLUSION
Approximately 400 impacts ranging 2-4 BW, 3 times/wk was enough stimuli to result in an osteogenic response in normally active girls; even in those actively involved in moderate impact sports outside school.

Notes Extract published in : Medicine & Science in Sports & Exercise Issue: Volume 35(5) Supplement 1, May 2003, p S13.
ISSN 0195-9131
Language eng
Field of Research 110604 Sports Medicine
Socio Economic Objective 920116 Skeletal System and Disorders (incl. Arthritis)
HERDC Research category E3 Extract of paper
Copyright notice ©2003, The American College of Sports Medicine
Persistent URL http://hdl.handle.net/10536/DRO/DU:30014072

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.