Artūrs Ivuškāns "Bone mineral parameters in 11–13-year-old boys: associations with body composition and physical activity" | University of Tartu

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Contacts of UT units

Faculty of Arts and Humanities
Faculty phone: 
+372 737 5341
Faculty address: 
Jakobi 2, rooms 116–121, 51005 Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5341
    Faculty address: 
    Jakobi 2, rooms 116–121, 51005 Tartu
  • Institute of History and Archaeology
    Faculty phone: 
    +372 737 5651
    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Estonian and General Linguistics
    Faculty phone: 
    +372 737 5221
    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Philosophy and Semiotics
    Faculty phone: 
    +372 737 5314
    Faculty address: 
    Jakobi 2, rooms 309–352, 51005 Tartu
  • Institute of Cultural Research
    Faculty phone: 
    (+372) 737 5223
    Faculty address: 
    Ülikooli 16, 51003 Tartu
  • School of Theology and Religious Studies
    Faculty phone: 
    +372 737 5301
    Faculty address: 
    Ülikooli 18–310, 50090 Tartu
  • College of Foreign Languages and Cultures
    Faculty address: 
    J. Liivi 4, 50409, Tartu
  • Viljandi Culture Academy
    Faculty phone: 
    +372 435 5232
    Faculty address: 
    Posti 1, 71004 Viljandi
Faculty of Social Sciences
Faculty phone: 
+372 737 5957
Faculty address: 
Lossi 36, 51003 Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5900
    Faculty address: 
    Lossi 36, 51003 Tartu
  • Institute of Education
    Faculty phone: 
    +372 737 6440
    Faculty address: 
    Salme 1a–29, 50103 Tartu
  • Johan Skytte Institute of Political Studies
    Faculty phone: 
    +372 737 5582
    Faculty address: 
    Lossi 36–301, 51003 Tartu
  • School of Economics and Business Administration
    Faculty phone: 
    +372 737 6310
    Faculty address: 
    Narva mnt 18, 51009 Tartu
  • Institute of Psychology
    Faculty phone: 
    +372 737 5902
    Faculty address: 
    Näituse 2, 50409 Tartu
  • School of Law
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    +372 737 5390
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    Näituse 20–324, 50409 Tartu
  • Institute of Social Studies
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    Lossi 36, 51003 Tartu
  • Narva College
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  • Pärnu College
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    Ringi 35, 80012 Pärnu
Faculty of Medicine
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+372 737 5326
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Ravila 19, 50411 Tartu
  • Dean's Office
    Faculty phone: 
    +372 737 5326
    Faculty address: 
    Ravila 19, 50411 Tartu
  • Institute of Biomedicine and Translational Medicine
    Faculty phone: 
    +372 737 4210
    Faculty address: 
    Biomeedikum, Ravila 19, 50411 Tartu
  • Institute of Pharmacy
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    Nooruse 1, 50411 Tartu
  • Institute of Dentistry
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    +372 731 9856
    Faculty address: 
    Raekoja plats 6, 51003 Tartu
  • Institute of Clinical Medicine
    Faculty phone: 
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    Faculty address: 
    L. Puusepa 8, 50406 Tartu
  • Institute of Family Medicine and Public Health
    Faculty phone: 
    +372 737 4190
    Faculty address: 
    Ravila 19, 50411 Tartu
  • Institute of Sport Sciences and Physiotherapy
    Faculty phone: 
    +372 737 5360
    Faculty address: 
    Jakobi 5–205, 51005 Tartu
Faculty of Science and Technology
Faculty phone: 
+372 737 5820
Faculty address: 
Vanemuise 46–208, 51014 Tartu
  • Dean's Office
    Faculty phone: 
    +372 737 5820
    Faculty address: 
    Vanemuise 46–208, 51003 Tartu
  • Institute of Computer Science
    Faculty phone: 
    +372 737 5445
    Faculty address: 
    Narva mnt 18, 51009 Tartu
  • Estonian Marine Institute
    Faculty phone: 
    +372 671 8902
    Faculty address: 
    Mäealuse 14, 12618 Tallinn
  • Institute of Physics
    Faculty address: 
    W. Ostwaldi 1, 50411 Tartu
  • Institute of Chemistry
    Faculty phone: 
    +372 737 5261
    Faculty address: 
    Ravila 14a, 50411 Tartu
  • Institute of Mathematics and Statistics
    Faculty phone: 
    +372 737 5860
    Faculty address: 
    Narva mnt 18, 51009 Tartu
  • Institute of Molecular and Cell Biology
    Faculty phone: 
    +372 737 5027
    Faculty address: 
    Riia 23, 23b–134, 51010 Tartu
  • Tartu Observatory
    Faculty phone: 
    +372 737 4510
    Faculty address: 
    Observatooriumi 1, Tõravere, 61602 Tartumaa
  • Institute of Technology
    Faculty phone: 
    +372 737 4800
    Faculty address: 
    Nooruse 1, 50411 Tartu
  • Institute of Ecology and Earth Sciences
    Faculty phone: 
    +372 737 5835
    Faculty address: 
    Vanemuise 46, 51003 Tartu
Institutions
  • Library
    Faculty phone: 
    +372 737 5702
    Faculty address: 
    W. Struve 1, 50091 Tartu
  • Youth Academy
    Faculty phone: 
    +372 737 5581
    Faculty address: 
    Uppsala 10, 51003 Tartu
  • Institute of Genomics
    Faculty phone: 
    +372 737 4000
    Faculty address: 
    Riia 23b, 51010 Tartu
  • Museum
    Faculty phone: 
    +372 737 5674
    Faculty address: 
    Lossi 25, 51003 Tartu
  • University of Tartu Natural History Museum and Botanical Garden
    Faculty phone: 
    +372 737 6076
    Faculty address: 
    Vanemuise 46, 51003 Tartu
Support Units
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Centre for Entrepreneurship and Innovation
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    +372 737 4809
    Faculty address: 
    Narva mnt 18, 51009, Tartu
  • University Office in Tallinn
    Faculty phone: 
    +372 737 6600
    Faculty address: 
    Teatri väljak 3, 10143 Tallinn
  • Estates Office
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    +372 737 5137
    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Finance Office
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    +372 737 5125
    Faculty address: 
    Jakobi 4, 51005 Tartu
  • Grant Office
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    +372 737 6215
    Faculty address: 
    Raekoja plats 9, 51004 Tartu
  • Information Technology Office
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Human Resources Office
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    Faculty address: 
    Ülikooli 18, rooms 302 and 304, 50090 Tartu
  • Internal Audit Office
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    Ülikooli 18-244, 51005 Tartu
  • Marketing and Communication Office
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    Faculty address: 
    Ülikooli 18, rooms 102, 104, 209, 210, 50090 Tartu
  • Office of Academic Affairs
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    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Procurement Office
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Rector's Strategy Office
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    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Student Council
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    Ülikooli 18b, 51005 Tartu
  • University of Tartu Press
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    Faculty address: 
    W. Struve 1, 50091 Tartu
Other Units
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    Faculty address: 
    Ujula 4, 51008 Tartu
  • Tartu Student Village
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    Faculty address: 
    Narva mnt 25, 51013 Tartu
  • Tartu Students’ Club
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    Faculty address: 
    Kalevi 24, 51010 Tartu
  • Tartu University Hospital
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  • University of Tartu Foundation
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  • View all other units

Artūrs Ivuškāns "Bone mineral parameters in 11–13-year-old boys: associations with body composition and physical activity"

Date: 
27.06.2014 - 12:00 to 14:00

Thesis supervisors:
Jarek Mäestu, University of Tartu
Jaak Jürimäe, University of Tartu
Toivo Jürimäe, University of Tartu

Opponent:
Arunas Emeljanovas, Lithuanian Sport University

Summary:
Puberty is one of the most dynamic periods of growth and development, and is characterized by rapid changes in body morphology and composition. Different studies have found that both positive and negative changes take place, which might have significant impact for the future life.

Pubertal years are also an important period for linear growth and bone mineral accrual. Bone mineralization increases with age, height, and body mass throughout childhood, with a most significant gain during pubertal development. Studies have indicated that approximately 40-50% increase in bone mass take place during the puberty, reaching the highest bone mass at approximately 20-22 years of age from where ongoing the bone mass starts to decrease. Osteoporosis can be characterized as a state with decreased bone mineral content that may result in fractures. Therefore, the higher is the achieved bone mass, the later the osteoporosis will probably occur. This indicates the high importance of the puberty period where the bone mineral parameters can be modified on great extent.

It has been shown that the increase in bone mineral parameters is highly related to mechanical loading to bones. One of these factors is the size of the body, with subjects who have higher body mass have also higher bone mineral density. In contrast, it has been argued that the main factor regarding bone mineral accrual is not the body mass per se, but the amount of lean body mass. Further, it has been found that physical activity, especially high impact physical activity has a positive influence on bone mineral parameters. However, it is not known what is the contribution of body composition in subjects with different physical activity levels. So far the majority of the studies have been mainly cross-sectional, while it is known that during puberty physical activity decreases significantly. Therefore, cross-sectional design might not be very reliable in describing the changes that occur in physical activity during puberty.

The general aim of the present study was to evaluate bone mineral parameters in normal and overweight boys aged 11-13 years in associations with body composition and physical activity.

According to the general aim, the specific aims of the present investigation were to:

1) investigate different bone mineral density values between overweight and normal weight boys (Study I);

2) investigate the relationships of different body composition parameters on whole body and areal bone mineral density values in overweight and normal weight boys (Study I);

3) investigate the relationships of different physical activity levels on whole body and areal bone mineral density values in overweight and normal weight boys (Study II);

4) investigate the physical activity changes to whole body and areal bone mineral accrual during one year period in 11-13-year-old boys (Study III).

264 boys, aged 11-13 years from Tartu and its surroundigs took part in this investigation. They were divided into normal and overweight categories according to cut-off points by McCarthy et al (2006). Their body composition was measured using DXA methodology, physical activity was measured by 7-day accelerometry and biological age by X-ray of the wrist. Similar testing was conducted in one-year period. Only those subjects were included into analysis who had accumulated all data from both measurements.

In conclusion:
1) Overweight boys, aged 11-13 years had higher whole body, lumbar spine and femoral neck BMC values compared with normal weight boys. In contrast, no differences in lumbar spine and femoral neck body apparent (volumetric) BMD were seen in both groups. Despite higher whole body BMD, overweight boys had lower whole body apparent (volumetric) BMD compared with normal weight boys;

2) Fat free mass characterizes better than fat mass and BMI bone mineral values in normal weight boys, while fat mass and BMI are better determinants of bone mineral values in overweight boys;

3) Physical activity is more associated with bone mineral values in overweight boys compared with normal weight boys, and in addition to vigorous physical activity, already moderate physical activity has the significant impact on bone mineral values in overweight boys;

4) The increase in sedentary time emerged as one of the main predictors from physical activity to have the negative influence on bone mineral acquisition during a one-year observation period in 11-13-year-old boys.

Location: 
UT Senate Hall
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